Flessa, Heiner

[["dc.bibliographiccitation.firstpage","36"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","JOURNAL OF PLANT NUTRITION AND SOIL SCIENCE-ZEITSCHRIFT FUR PFLANZENERNAHRUNG UND BODENKUNDE"],["dc.bibliographiccitation.lastpage","51"],["dc.bibliographiccitation.volume","171"],["dc.contributor.author","Flessa, Heiner"],["dc.contributor.author","Amelung, Wulf"],["dc.contributor.author","Helfrich, Mirjam"],["dc.contributor.author","Wiesenberg, Guido L. B."],["dc.contributor.author","Gleixner, Gerd"],["dc.contributor.author","Brodowski, Sonja"],["dc.contributor.author","Rethemeyer, Janet"],["dc.contributor.author","Kramer, Christiane"],["dc.contributor.author","Grootes, Pieter M."],["dc.date.accessioned","2018-11-07T11:18:44Z"],["dc.date.available","2018-11-07T11:18:44Z"],["dc.date.issued","2008"],["dc.description.abstract","Quantitative information about the amount and stability of organic carbon (OC) in different soil organic-matter (OM) fractions and in specific organic compounds and compound-classes is needed to improve our understanding of organic-matter sequestration in soils. In the present paper, we summarize and integrate results performed on two different arable soils with continuous maize cropping (a) Stagnic Luvisol with maize cropping for 24 y, b) Luvic Phaeozem with maize cropping for 39 y) to identify (1) the storage of OC in different soil organic-matter fractions, (2) the function of these fractions with respect to soil-OC stabilization, (3) the importance and partitioning of fossil-C deposits, and (4) the rates of soil-OC stabilization as assessed by compound-specific isotope analyses. The fractionation procedures included particle-size fractionation, density fractionation, aggregate fractionation, acid hydrolysis, different oxidation procedures, isolation of extractable lipids and phospholipid fatty acids, pyrolysis, and the determination of black C. Stability of OC was determined by C-13 and C-14 analyses. The main inputs of OC were plant litter (both sites) and deposition of fossil C likely from coal combustion and lignite dust (only Phaeozem). Total soil OC stocks down to a depth of 65cm (7.83kg m(-2) in the Luvisol and 9.66kg m(-2) in the Phaeozem) consisted mainly of mineral-bound OC (87% of total SOC in the Luvisol and 69% in the Phaeozem). In the Luvisol, free light particulate OM, OM associated with sand and coarse silt, and particulate OM occluded in macro-aggregates represented SOM fractions with mean turnover times shorter than that of the bulk soil OC (54 y). Additionally, the turnover of all individual compounds or compound classes (except for black carbon) was faster than that of bulk soil OC. These OM fractions that were less stable than the bulk soil OM made up 13% to 20% of the total OC. Organic matter in fine and medium silt and clay fractions, particulate OM occluded in micro-aggregates (53-250 mu m) and OM resistant to acid hydrolysis had intermediate turnover times of about 50-100 y. These fractions with intermediate turnover times contributed 70%-80% to total soil OC. Passive OM with turnover times >200 y was isolated from the mineral-bound OM by different oxidation procedures (H2O2, Na2S2O8) and made up <= 10% of the total OC. The isotopic signature of PLFAs suggests an efficient recycling of OC derived from C3 substrate. In the Phaeozem, partitioning of maize-derived C exhibited a pattern similar to the Luvisol, but turnover rates of vegetation-derived soil OC were lower, probably because of the considerably smaller input of plant residues. Fossil C contributed approx. 50% to the total OC and accumulated preferentially in the particulate OM occluded in aggregates and in the fine-sand and coarse-silt fractions. It formed a large stock of passive soil OM but a minor part also entered the microbial C cycle. The results show that the partitioning of OC derived from vegetation and deposition of fossil compounds among soil fractions differed mainly because of their different bioavailability and recalcitrance. There was no evidence for a high recalcitrance of individual plant compounds. Mineral-bound OM resistant to oxidation by H2O2 and Na2S2O8 represented highly stable OC pools in both soils."],["dc.identifier.doi","10.1002/jpln.200700050"],["dc.identifier.isi","000253431000004"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/55110"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wiley-v C H Verlag Gmbh"],["dc.relation.issn","1436-8730"],["dc.title","Storage and stability of organic matter and fossil carbon in a Luvisol and Phaeozem with continuous maize cropping: A synthesis"],["dc.type","review"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","307"],["dc.bibliographiccitation.issue","3-4"],["dc.bibliographiccitation.journal","Geoderma"],["dc.bibliographiccitation.lastpage","325"],["dc.bibliographiccitation.volume","105"],["dc.contributor.author","Flessa, H."],["dc.contributor.author","Ruser, R."],["dc.contributor.author","Schilling, R."],["dc.contributor.author","Loftfield, N."],["dc.contributor.author","Munch, J. C."],["dc.contributor.author","Kaiser, E. A."],["dc.contributor.author","Beese, F."],["dc.date.accessioned","2018-11-07T10:32:10Z"],["dc.date.available","2018-11-07T10:32:10Z"],["dc.date.issued","2002"],["dc.description.abstract","The large temporal variation in nitrous oxide (N2O). methane (CH4) and carbon dioxide (CO2) flux rates is a major source of error when estimating cumulative fluxes of these radiative active trace gases. We developed an automated system for near-continuous, long-term measurements of N2O, CH4 and CO2 fluxes from cropland soils and used it to study the temporal variation of N2O and CH4 fluxes from potato (Solanum tuberosum L.) fields during the crop periods of 1997 and 1998, and also to determine the effects of management practices and weather. Additionally, we evaluated the error of other common methods, namely, weekly or monthly measurements, used for estimating cumulative fluxes. ne fluxes were quantified separately for the ridges, uncompacted interrows and tractor-compacted interrows. Total N2O-N emission from the potato field during the growing period (end of May to September) was 1.6 kg ha(-1) in 1997 and 2.0 kg ha(-1) in 1998; emissions were highest for the tractor-compacted soil. Periods of increased N2O losses were induced by heavy precipitation (in particular in compacted soil) and by the killing of potato tops (on the ridges) by herbicide application. The total CH4-C uptake in the potato field during the growing period was 295 g ha(-1) in 1997 and 317 g ha(-1) in 1998. The major fraction of the total CH, uptake (approximate to 86%) occurred on the ridges. Weekly measurements of N2O fluxes complemented by additional event-related flux determinations provided accurate estimates of total emissions. The monthly flux determination was not adequate for determining the temporal variation of the N2O emission rates. Weekly measurements were sufficient to provide reliable estimates of the cumulative CH4 uptake. (C) 2002 Elsevier Science B.V. All rights reserved."],["dc.identifier.doi","10.1016/S0016-7061(01)00110-0"],["dc.identifier.isi","000173148400010"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/44283"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Bv"],["dc.relation.issn","0016-7061"],["dc.title","N2O and CH4 fluxes in potato fields: automated measurement, management effects and temporal variation"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","395"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","Tree Physiology"],["dc.bibliographiccitation.lastpage","401"],["dc.bibliographiccitation.volume","21"],["dc.contributor.author","Dyckmans, Jens"],["dc.contributor.author","Flessa, H."],["dc.date.accessioned","2018-11-07T09:15:35Z"],["dc.date.available","2018-11-07T09:15:35Z"],["dc.date.issued","2001"],["dc.description.abstract","Influence of plant internal nitrogen (N) stocks on carbon (C) and N uptake and allocation in 3-year-old beech (Fagus sylvatica L.) was studied in two N-15- and C-13-labeling experiments. In the first experiment, trees were grown in sand and received either no N nutrition (-N treatment) or 4 mM unlabeled N (+N treatment) for 1 year. The -N- and +N-pretreated trees were then supplied with 4 mM N-15 and grown in a (CO2)-C-13 atmosphere for 24 weeks. In the second experiment, trees were pretreated with 4 mM 15N for 1 year and then supplied with unlabeled N for 24 weeks and the remobilization of stored N-15 was monitored. On the whole-plant level, uptake of new C was significantly reduced in -N-pretreated trees; however, partitioning of new C was not altered, although there was a trend toward increased belowground respiration. The amount of N taken up was not influenced by N nutrition in the previous year. In +N-pretreated trees, partitioning of new N was dominated by the fine roots (59.7% at Week 12), whereas in -N-pretreated trees, partitioning of new N favored stem, coarse roots and fine roots (24, 21 and 31.9%, respectively, at Week 12), indicating the formation of N stores. The contribution of previous-year N to leaf N was about 15%. The N remobilized for leaf formation had been stored in stem and coarse roots. We conclude that, within a growing season, the growth of beech is strongly determined by the availability of tree internal N stores, whereas the current N supply is of less importance."],["dc.identifier.isi","000168067200006"],["dc.identifier.pmid","11282579"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/27728"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Heron Publishing"],["dc.relation.issn","0829-318X"],["dc.title","Influence of tree internal N status on uptake and translocation of C and N in beech: a dual C-13 and N-15 labeling approach"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","97"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Soil Biology and Biochemistry"],["dc.bibliographiccitation.lastpage","105"],["dc.bibliographiccitation.volume","40"],["dc.contributor.author","Engelking, Brigitte"],["dc.contributor.author","Flessa, Heiner"],["dc.contributor.author","Joergensen, Rainer Georg"],["dc.date.accessioned","2018-11-07T11:20:48Z"],["dc.date.available","2018-11-07T11:20:48Z"],["dc.date.issued","2008"],["dc.description.abstract","A 67-day incubation experiment was carried out with a soil initially devoid of any organic matter due to heating, which was amended with sugarcane sucrose (C-4-sucrose with a delta C-13 value of -10.5 parts per thousand), inorganic N and an inoculum for recolonisation and subsequently at day 33 with C-3-cellulose (delta C-13 value of -23.4 parts per thousand). In this soil, all organic matter is in the microbial biomass or in freshly formed residues, which makes it possible to analyse more clearly the role of microbial residues for decomposition of N-poor substrates. The average delta C-13 value over the whole incubation period was -10.7 parts per thousand in soil total C in the treatments without C-3-cellulose addition. In the CO2 evolved, the delta C-13 values decreased from -13.4 parts per thousand to -15.4 parts per thousand during incubation. In the microbial biomass, the delta C-13 values increased from -11. 5 parts per thousand to -10. 1 parts per thousand at days 33 and 38. At day 67, 36% of the C-4-sucrose was left in the treatment without a second amendment. The addition of C-3-cellulose resulted in a further 7% decrease, but 4% of the C-3-cellulose was lost during the second incubation period. Total microbial biomass C declined from 200 mu g g(-1) soil at day 5 to 70 mu g g(-1) soil at day 67. Fungal ergosterol increased to 1.5 mu g g(-1) soil at day 12 and declined more or less linearly to 0.4 mu g g(-1) soil at day 67. Bacterial muramic acid declined from a maximum of 35 mu g g(-1) soil at day 5 to a constant level of around 16 mu g g(-1) soil. Glucosamine showed a peak value at day 12. Galactosamine remained constant throughout the incubation. The fungal C/bacterial C ratio increased more or less linearly from 0.38 at day 5 to 1.1 at day 67 indicating a shift in the microbial community from bacteria to fungi during the incubation. The addition Of C-3-cellulose led to a small increase in C-3-derived microbial biomass C, but to a strong increase in C-4-derived microbial biomass C. At days 45 and 67, the addition of N-free C-3-cellulose significantly decreased the C/N ratio of the microbial residues, suggesting that this fraction did not serve as an N-source, but as an energy source. (c) 2007 Elsevier Ltd. All rights reserved."],["dc.identifier.doi","10.1016/j.soilbio.2007.07.009"],["dc.identifier.isi","000251242000009"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/55624"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Pergamon-elsevier Science Ltd"],["dc.relation.issn","0038-0717"],["dc.title","Formation and use of microbial residues after adding sugarcane sucrose to a heated soil devoid of soil organic matter"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","4629"],["dc.bibliographiccitation.issue","15"],["dc.bibliographiccitation.journal","Biogeosciences"],["dc.bibliographiccitation.lastpage","4650"],["dc.bibliographiccitation.volume","18"],["dc.contributor.author","Rohe, Lena"],["dc.contributor.author","Anderson, Traute-Heidi"],["dc.contributor.author","Flessa, Heinz"],["dc.contributor.author","Goeske, Anette"],["dc.contributor.author","Lewicka-Szczebak, Dominika"],["dc.contributor.author","Wrage-Mönnig, Nicole"],["dc.contributor.author","Well, Reinhard"],["dc.date.accessioned","2021-09-01T06:43:00Z"],["dc.date.available","2021-09-01T06:43:00Z"],["dc.date.issued","2021"],["dc.description.abstract","Abstract. The coexistence of many N2O production pathways in soil hampers differentiation of microbial pathways. The question of whether fungi are significant contributors to soil emissions of the greenhouse gas nitrous oxide (N2O) from denitrification has not yet been resolved. Here, three approaches to independently investigate the fungal fraction contributing to N2O from denitrification were used simultaneously for, as far as we know, the first time (modified substrate-induced respiration with selective inhibition (SIRIN) approach and two isotopic approaches, i.e. end-member mixing approach (IEM) using the 15N site preference of N2O produced (SPN2O) and the SP/δ18O mapping approach (SP/δ18O Map)). This enabled a comparison of methods and a quantification of the importance of fungal denitrification in soil. Three soils were incubated in four treatments of the SIRIN approach under anaerobic conditions to promote denitrification. While one treatment without microbial inhibition served as a control, the other three treatments were amended with inhibitors to selectively inhibit bacterial, fungal, or bacterial and fungal growth. These treatments were performed in three variants. In one variant, the 15N tracer technique was used to estimate the effect of N2O reduction on the N2O produced, while two other variants were performed under natural isotopic conditions with and without acetylene. All three approaches revealed a small contribution of fungal denitrification to N2O fluxes (fFD) under anaerobic conditions in the soils tested. Quantifying the fungal fraction with modified SIRIN was not successful due to large amounts of uninhibited N2O production. In only one soil could fFD be estimated using modified SIRIN, and this resulted in 28 ± 9 %, which was possibly an overestimation, since results obtained by IEM and SP/δ18O Map for this soil resulted in fFD of below 15 % and 20 %, respectively. As a consequence of the unsuccessful SIRIN approach, estimation of fungal SPN2O values was impossible. While all successful methods consistently suggested a small or missing fungal contribution, further studies with stimulated fungal N2O fluxes by adding fungal C substrates and an improved modified SIRIN approach, including alternative inhibitors, are needed to better cross-validate the methods."],["dc.description.abstract","Abstract. The coexistence of many N2O production pathways in soil hampers differentiation of microbial pathways. The question of whether fungi are significant contributors to soil emissions of the greenhouse gas nitrous oxide (N2O) from denitrification has not yet been resolved. Here, three approaches to independently investigate the fungal fraction contributing to N2O from denitrification were used simultaneously for, as far as we know, the first time (modified substrate-induced respiration with selective inhibition (SIRIN) approach and two isotopic approaches, i.e. end-member mixing approach (IEM) using the 15N site preference of N2O produced (SPN2O) and the SP/δ18O mapping approach (SP/δ18O Map)). This enabled a comparison of methods and a quantification of the importance of fungal denitrification in soil. Three soils were incubated in four treatments of the SIRIN approach under anaerobic conditions to promote denitrification. While one treatment without microbial inhibition served as a control, the other three treatments were amended with inhibitors to selectively inhibit bacterial, fungal, or bacterial and fungal growth. These treatments were performed in three variants. In one variant, the 15N tracer technique was used to estimate the effect of N2O reduction on the N2O produced, while two other variants were performed under natural isotopic conditions with and without acetylene. All three approaches revealed a small contribution of fungal denitrification to N2O fluxes (fFD) under anaerobic conditions in the soils tested. Quantifying the fungal fraction with modified SIRIN was not successful due to large amounts of uninhibited N2O production. In only one soil could fFD be estimated using modified SIRIN, and this resulted in 28 ± 9 %, which was possibly an overestimation, since results obtained by IEM and SP/δ18O Map for this soil resulted in fFD of below 15 % and 20 %, respectively. As a consequence of the unsuccessful SIRIN approach, estimation of fungal SPN2O values was impossible. While all successful methods consistently suggested a small or missing fungal contribution, further studies with stimulated fungal N2O fluxes by adding fungal C substrates and an improved modified SIRIN approach, including alternative inhibitors, are needed to better cross-validate the methods."],["dc.identifier.doi","10.5194/bg-18-4629-2021"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/89197"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-455"],["dc.relation.eissn","1726-4189"],["dc.title","Comparing modified substrate-induced respiration with selective inhibition (SIRIN) and N₂O isotope approaches to estimate fungal contribution to denitrification in three arable soils under anoxic conditions"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","325"],["dc.bibliographiccitation.journal","Agriculture, Ecosystems & Environment"],["dc.bibliographiccitation.lastpage","342"],["dc.bibliographiccitation.volume","246"],["dc.contributor.author","Buchen, Caroline"],["dc.contributor.author","Well, Reinhard"],["dc.contributor.author","Helfrich, Mirjam"],["dc.contributor.author","Fuß, Roland"],["dc.contributor.author","Kayser, Manfred"],["dc.contributor.author","Gensior, Andreas"],["dc.contributor.author","Benke, Matthias"],["dc.contributor.author","Flessa, Heinz"],["dc.date.accessioned","2018-03-13T13:52:33Z"],["dc.date.available","2018-03-13T13:52:33Z"],["dc.date.issued","2017"],["dc.identifier.doi","10.1016/j.agee.2017.06.013"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/12999"],["dc.notes.status","zu prüfen"],["dc.title","Soil mineral N dynamics and N 2 O emissions following grassland renewal"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","539"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","European Journal of Soil Science"],["dc.bibliographiccitation.lastpage","546"],["dc.bibliographiccitation.volume","57"],["dc.contributor.author","Brodowski, S."],["dc.contributor.author","John, Bettina"],["dc.contributor.author","Flessa, H."],["dc.contributor.author","Amelung, Wulf"],["dc.date.accessioned","2018-11-07T09:28:25Z"],["dc.date.available","2018-11-07T09:28:25Z"],["dc.date.issued","2006"],["dc.description.abstract","The great stability of black carbon (BC) in soils may not be solely attributable to its refractory structure but also to poor accessibility when physically enveloped by soil particles. Our aim was to elucidate the intensity of physical entrapment of BC within soil aggregates. For this purpose, the A horizon of a forest, and of a grassland soil, and of three soils under tillage, were sampled at the experimental station Rotthalmunster, Germany. Black carbon was assessed in water-stable aggregates and aggregate-density fractions using benzene polycarboxylic acids as specific markers. The greatest BC concentrations made up 7.2% of organic carbon and were found in the < 53 mu m fraction. The smallest BC concentrations occurred in the large macroaggregate fractions (> 2 mm). This pattern has been sustained even after tillage. The C-normalized BC concentrations were significantly greater (P < 0.05) in the occluded particulate organic matter (OPOM) fractions than in the free particulate organic matter (FPOM) and the mineral fractions. This enrichment of BC compared with organic carbon in the OPOM fractions amounted to factors of 1.5-2.7. Hence, BC was embedded within microaggregates in preference to other organic carbon compounds. Only 2.5-3.5% of BC was located in the OPOM fraction < 1.6 g cm(-3), but 22-24% in the OPOM fraction with a density of 1.6-2.0 g cm(-3). This suggests that BC possibly acted as a binding agent or was selectively enriched during decomposition of protected SOM, or both. Physical inclusion, particularly within microaggregates, could therefore contribute to the long mean-residence times of soil-inherent BC."],["dc.identifier.doi","10.1111/j.1365-2389.2006.00807.x"],["dc.identifier.isi","000238486100012"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/30769"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","1351-0754"],["dc.title","Aggregate-occluded black carbon in soil"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","376"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Journal of Plant Nutrition and Soil Science"],["dc.bibliographiccitation.lastpage","387"],["dc.bibliographiccitation.volume","179"],["dc.contributor.author","Sommer, Janine"],["dc.contributor.author","Dippold, Michaela Anna"],["dc.contributor.author","Flessa, Heinz"],["dc.contributor.author","Kuzyakov, Yakov"],["dc.date.accessioned","2018-11-07T10:13:30Z"],["dc.date.available","2018-11-07T10:13:30Z"],["dc.date.issued","2016"],["dc.description.abstract","Forest management requires a profound understanding of how tree species affect C and N cycles in ecosystems. The large C and N stocks in forest soils complicate research on the effects of tree species on C and N pools. In-situ C-13 and N-15 labeling in undisturbed, natural forests enable not only tracing of C and N fluxes, but also reveal insight into the interactions at the plant-soil-atmosphere interface. In-situ dual C-13 and N-15 pulse labeling of 20 beeches (Fagus sylvatica L.) and 20 ashes (Fraxinus excelsior L.) allowed tracing the fate of assimilated C and N in trees and soils in an unmanaged forest system in the Hainich National Park (Germany). Leaf, stem, root, and soil samples as well as microbial biomass were analyzed to quantify the allocation of 13C and N-15 for 60 d after labeling and along spatial gradients in the soil with increasing distance from the stem. For trees of similar heights (approximate to 4 m), beech (20%) assimilated twice as much as ash (9%) of the applied (CO2)-C-13, but beech and ash incorporated similar N-15 amounts (45%) into leaves. The photosynthates were transported belowground through the phloem more rapidly in beech than in ash. Ash preferentially accumulated N-15 and C-13 in the roots. In contrast, beech released more of this initially assimilated C-13 (2.0% relative C-13 allocation) and N-15 (0.1% relative N-15 allocation) via rhizodeposition into the soil than ash (0.2% relative C-13, 0.04% relative N-15 allocation), which was also subsequently recovered in microbial biomass. These results on C and N partitioning contribute to an improved understanding of the effects of European beech and ash on the C and N cycles in deciduous broad-leaved forest. Differences in C and N allocation patterns between ash and beech are one mechanism of niche differentiation in forests containing both species."],["dc.description.sponsorship","German Research Foundation (DFG); DFG Graduiertenkolleg 1086"],["dc.identifier.doi","10.1002/jpln.201500384"],["dc.identifier.isi","000377268800007"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/40448"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","1522-2624"],["dc.relation.issn","1436-8730"],["dc.title","Allocation and dynamics of C and N within plant-soil system of ash and beech"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","891"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","Biology and Fertility of Soils"],["dc.bibliographiccitation.lastpage","895"],["dc.bibliographiccitation.volume","44"],["dc.contributor.author","Potthoff, Martin"],["dc.contributor.author","Dyckmans, Jens"],["dc.contributor.author","Flessa, Heinz"],["dc.contributor.author","Beese, Friedrich"],["dc.contributor.author","Joergensen, Rainer Georg"],["dc.date.accessioned","2018-11-07T11:13:13Z"],["dc.date.available","2018-11-07T11:13:13Z"],["dc.date.issued","2008"],["dc.description.abstract","A 28-day incubation experiment at 12 degrees C was carried out on the decomposition of maize leaf litter to answer the questions: (1) Is the decomposition process altered by chemical manipulations due to differences in the colonization of maize leaf litter? (2) Do organisms using this maize material contribute significantly to the soil microbial biomass? The extraction of the maize straw reduced its initial microbial biomass C content by 25%. Fumigation and extraction eliminated the microbial biomass by 88%. In total, 17% of added maize straw C was mineralized to CO(2) during the 28-day incubation at 12 degrees C in the treatment with non-manipulated straw. Only 14% of added C was mineralized in the treatment with extracted straw as well as in the treatment with fumigated and extracted straw. The net increase in microbial biomass C was 79 mu g g(-1) soil in the treatment with non-manipulated straw and an insignificant 9 mu g g(-1) soil in the two treatments with manipulated straw. However, the net increase did not reflect the fact that the addition of maize straw replaced an identical 58% (approximate to 180 mu g g(-1) soil) of the autochthonous microbial biomass C(3)-C in all three straw treatments. In the two treatments with manipulated straw, the formation of maize-derived microbial biomass C(4)-C was significantly reduced by 25%. In the three straw treatments, the ratio of fungal ergosterol-to-microbial biomass C ratio showed a constant 60% increase compared to the control, and the contents of glucosamine and muramic acid increased by 18%. The average fungal C/bacterial C ratio was 3.6 in the soil and 5.0 in the recovered maize straw, indicating that fungal dominance was not altered by the initial chemical manipulations of the maize straw-colonizing microorganisms."],["dc.identifier.doi","10.1007/s00374-007-0266-y"],["dc.identifier.isi","000257201600010"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/53840"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","0178-2762"],["dc.title","Decomposition of maize residues after manipulation of colonization and its contribution to the soil microbial biomass"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","114"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Soil and Tillage Research"],["dc.bibliographiccitation.lastpage","121"],["dc.bibliographiccitation.volume","112"],["dc.contributor.author","Ludwig, B."],["dc.contributor.author","Bergstermann, Anja"],["dc.contributor.author","Priesack, Eckart"],["dc.contributor.author","Flessa, H."],["dc.date.accessioned","2018-11-07T08:57:45Z"],["dc.date.available","2018-11-07T08:57:45Z"],["dc.date.issued","2011"],["dc.description.abstract","The choice of tillage system affects crop growth and soil nitrogen dynamics. Models help us to better understand these systems and the interaction of the processes involved. Objectives were to test a calibration and validation scheme for applications of the denitrification-decomposition (DNDC) model to describe a long-term field experiment with conventional tillage (CT) and reduced tillage (RI) at two sites (G and silty Haplic Luvisols) near Gottingen, Germany (G-CT, G-RI, H-CT, H-RI). Crop growth of field bean (Vicia faba L) and winter wheat (Triticum aestivum L) as well as soil water dynamics and nitrous oxide (N2O) emissions were determined for two subsequent years. A model test was performed based on a model parameterization to best describe the case G-CT. This parameterization was then applied to the other cases as a retrospective simulation. Results of model variant vi (no parameter optimization) indicated that soil water contents were not accurately simulated using the DNDC default values for a silt loam. After successful calibration of the soil water flow model using modified water-filled pore spaces at field capacity and wilting point and a modified hydro-conductivity that led to a good fit of the measured water content data, grain yields were markedly underestimated and modelled N2O emissions were too large (v2). An optimization of the crop properties (maximum grain yield. N fixation index, thermal degree days, transpiration coefficient) was essential for a better match of measured yields (v3). Further adjustments in the model (v4) were required to better match cumulative N2O emissions: reducing the initial soil organic carbon content and mineralization rates. Predictions of crop yields and annual cumulative N2O emissions using model variant v4 were fairly accurate for the reduced tillage system G-RI and also for the second field experiment H-CT and H-RI, but annual distributions of N2O emissions were not. Overall our results indicate that site specific calibration was an essential requirement for the silty German sites, and that the pedotransfer functions and denitrification submodel of DNDC may need further improvement. (C) 2010 Elsevier B.V. All rights reserved."],["dc.description.sponsorship","Deutsche Forschungsgemeinschaft [1397]"],["dc.identifier.doi","10.1016/j.still.2010.12.005"],["dc.identifier.isi","000288689800002"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/23476"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Bv"],["dc.relation.issn","0167-1987"],["dc.title","Modelling of crop yields and N2O emissions from silty arable soils with differing tillage in two long-term experiments"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]