Pausch, Johanna

[["dc.bibliographiccitation.firstpage","1"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","Journal of Plant Nutrition and Soil Science"],["dc.bibliographiccitation.lastpage","8"],["dc.bibliographiccitation.volume","182"],["dc.contributor.author","Kumar, Amit"],["dc.contributor.author","Shahbaz, Muhammad"],["dc.contributor.author","Koirala, Manisha"],["dc.contributor.author","Blagodatskaya, Evgenia"],["dc.contributor.author","Seidel, Sabine Julia"],["dc.contributor.author","Kuzyakov, Yakov"],["dc.contributor.author","Pausch, Johanna"],["dc.date.accessioned","2019-12-03T12:51:36Z"],["dc.date.accessioned","2021-10-27T13:20:08Z"],["dc.date.available","2019-12-03T12:51:36Z"],["dc.date.available","2021-10-27T13:20:08Z"],["dc.date.issued","2019"],["dc.description.abstract","To overcome soil nutrient limitation, many plants have developed complex nutrient acquisition strategies including altering root morphology, root hair formation or colonization by arbuscular mycorrhizal fungi (AMF). The interactions of these strategies and their plasticity are, however, affected by soil nutrient status throughout plant growth. Such plasticity is decisive for plant phosphorus (P) acquisition in P-limited soils. We investigated the P acquisition strategies and their plasticity of two maize genotypes characterized by the presence or absence of root hairs. We hypothesized that in the absence of root hairs plant growth is facilitated by traits with complementary functions, e.g., by higher root mycorrhizal colonization. This dependence on complementary traits will decrease in P fertilized soils. At early growth stages, root hairs are of little benefit for nutrient uptake. Regardless of the presence or absence of root hairs, plants produced average root biomass of 0.14 g per plant and exhibited 23% root mycorrhizal colonization. At later growth stages of maize, contrasting mechanisms with functional complementarity explained similar plant biomass production under P limitation: the presence of root hairs versus higher root mycorrhizal colonization (67%) favored by increased fine root diameter in absence of root hairs. P fertilization decreased the dependence of plant on specific root traits for nutrient acquisition. Through root trait plasticity, plants can minimize trade-offs for developing and maintaining functional traits, while increasing the benefit in terms of nutrient acquisition and plant growth. The present study highlights the plasticity of functional root traits for efficient nutrient acquisition strategies in agricultural systems with low nutrient availability."],["dc.identifier.doi","10.1002/jpln.201900322"],["dc.identifier.issn","1436-8730"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/16813"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/91941"],["dc.language.iso","en"],["dc.notes.intern","Migrated from goescholar"],["dc.relation.issn","1436-8730"],["dc.relation.orgunit","Fakultät für Agrarwissenschaften"],["dc.rights","CC BY 4.0"],["dc.rights.access","openAccess"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0"],["dc.subject","arbuscular mycorrhizal colonization; nutrient acquisition; root hairs; root morphology; roothairless3 mutant; root traits"],["dc.subject.ddc","630"],["dc.title","Root trait plasticity and plant nutrient acquisition in phosphorus limited soil"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","233"],["dc.bibliographiccitation.journal","Applied Soil Ecology"],["dc.bibliographiccitation.lastpage","239"],["dc.bibliographiccitation.volume","125"],["dc.contributor.author","Kumar, Amit"],["dc.contributor.author","Shahbaz, Muhammad"],["dc.contributor.author","Blagodatskaya, Evgenia"],["dc.contributor.author","Kuzyakov, Yakov"],["dc.contributor.author","Pausch, Johanna"],["dc.date.accessioned","2020-12-10T14:22:27Z"],["dc.date.available","2020-12-10T14:22:27Z"],["dc.date.issued","2018"],["dc.identifier.doi","10.1016/j.apsoil.2018.02.001"],["dc.identifier.issn","0929-1393"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/71619"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Maize phenology alters the distribution of enzyme activities in soil: Field estimates"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1"],["dc.bibliographiccitation.journal","Applied Soil Ecology"],["dc.bibliographiccitation.lastpage","10"],["dc.bibliographiccitation.volume","90"],["dc.contributor.author","Tian, Jing"],["dc.contributor.author","Pausch, Johanna"],["dc.contributor.author","Yu, G."],["dc.contributor.author","Blagodatskaya, Evgenia"],["dc.contributor.author","Gao, Yang"],["dc.contributor.author","Kuzyakov, Yakov"],["dc.date.accessioned","2018-11-07T09:56:58Z"],["dc.date.available","2018-11-07T09:56:58Z"],["dc.date.issued","2015"],["dc.description.abstract","Soil organic matter (SOM) pools, allocated within various aggregates, are characterized by different degradability and turnover rates that depend on the spatial accessibility of organics and their recalcitrance. Hence, to understand the processes and mechanisms of SOM cycling and stability, the contribution of individual aggregate size classes to the total CO2 efflux including extra mineralization via priming effect (PE) should be considered. In this study, we determined whether aggregate size classes and their disruption affected the mineralization of SOM and induced PE depending on the primer amount. Soil samples were separated into three aggregate size classes (>2mm, 2-0.25mm macroaggregates and <0.25mm microaggregates). Half of the samples within each class were left intact, whereas half were crushed. After the addition of two levels of C-14-labeled glucose, the amount of C-14 in CO2 efflux and microbial biomass were measured several times during the 49-day incubation. Cumulative SOM-derived CO2 production from the macroaggregates was 16-21% greater than the CO2 production from the microaggregates after 49 days. The percentage of glucose mineralized to CO2 increased with the level of glucose addition, but C-14 incorporation into microbial biomass decreased, indicating lower carbon (C) use efficiency at high substrate availability. Aggregate disruption had no effect on the cumulative total and SOM-derived CO2 production, but it increased glucose mineralization up to 11.2% while the percentage of added glucose incorporated into microbial biomass in macroaggregates decreased. The PE increased with an increased glucose level for the intact aggregates. Aggregate disruption increased the PE in all aggregates sizes under low glucose level. In summary, our findings demonstrate that the aggregate size class has clear effects on C mineralization while their disruption affects the added labile C decomposition and transformation, indicating the relevance of soil structure for SOM cycling in terms of priming and C sequestration. (C) 2015 Elsevier B.V. All rights reserved."],["dc.identifier.doi","10.1016/j.apsoil.2015.01.014"],["dc.identifier.isi","000351691600001"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/37070"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Bv"],["dc.relation.issn","1873-0272"],["dc.relation.issn","0929-1393"],["dc.title","Aggregate size and their disruption affect C-14-labeled glucose mineralization and priming effect"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","111"],["dc.bibliographiccitation.journal","Soil Biology and Biochemistry"],["dc.bibliographiccitation.lastpage","118"],["dc.bibliographiccitation.volume","92"],["dc.contributor.author","Löppmann, Sebastian"],["dc.contributor.author","Blagodatskaya, Evgenia V."],["dc.contributor.author","Pausch, Johanna"],["dc.contributor.author","Kuzyakov, Yakov"],["dc.date.accessioned","2018-11-07T10:21:40Z"],["dc.date.available","2018-11-07T10:21:40Z"],["dc.date.issued","2016"],["dc.description.abstract","Microbial and enzyme functioning depends on the quality of substrates, which strongly differ in bare soil and in the hotspots of microbial activity such as the rhizosphere and detritusphere. We established a field experiment to determine the effects of contrasting substrate quality, namely, soil organic matter, maize shoot litter (detritusphere) and maize rhizodeposits (rhizosphere) on microorganisms and their extracellular enzymes in an arable soil. Kinetic parameters (V-max and K-m) of four hydrolytic extracellular enzymes: beta-cellobiohydrolase, beta-glucosidase, acid phosphate and beta-xylosidase were analyzed in 0-10 and 10-20 cm to elucidate the effects of substrate content on substrate affinity and catalytic efficiency (V-max/K-m). Living roots increased microbial biomass by 179% and microbial respiration by 100% compared to fallow soil. Lower enzyme affinities to substrates (e.g. 93% for beta-glucosidase) in rooted soil pointed to the domination of r-strategists, which are favored in the decomposition of labile organics common in the rhizosphere. No differences in catalytic properties of cellulolytic enzymes were detected between bulk and litter-treated soil, indicating the recalcitrance of organics in both treatments. The rhizosphere and detritusphere effects on enzyme kinetics were negligible in 10-20 cm, except beta-glucosidase. The reduction of K-m of all enzymes in 10-20 cm versus the upper 10 cm indicated increasing substrate affinity with depth. Nonetheless, the catalytic efficiency increased from 0 to 10 to 10-20 cm (e.g. up to 420% for acid phosphatase), reflecting changes in properties and functioning of enzymatic systems. This pointed to a shift towards a more K-selected microbial community with higher affinity and more efficient substrate utilization. It also indicated the microbial adaptation to decreasing substrate contents with depth by altered enzyme functioning. Overall, the catalytic properties of cellulolytic enzymes were much more strongly affected by plants (substrate quality in the rhizosphere and detritusphere compared to bare fallow) than by depth (substrate content). (C) 2015 Elsevier Ltd. All rights reserved."],["dc.identifier.doi","10.1016/j.soilbio.2015.09.020"],["dc.identifier.isi","000367487700012"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/42132"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","0038-0717"],["dc.title","Substrate quality affects kinetics and catalytic efficiency of exo-enzymes in rhizosphere and detritusphere"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","199"],["dc.bibliographiccitation.journal","Soil Biology and Biochemistry"],["dc.bibliographiccitation.lastpage","210"],["dc.bibliographiccitation.volume","97"],["dc.contributor.author","Tian, Jing"],["dc.contributor.author","Pausch, Johanna"],["dc.contributor.author","Yu, G."],["dc.contributor.author","Blagodatskaya, Evgenia"],["dc.contributor.author","Kuzyakov, Yakov"],["dc.date.accessioned","2018-11-07T10:13:59Z"],["dc.date.available","2018-11-07T10:13:59Z"],["dc.date.issued","2016"],["dc.description.abstract","Decomposition of soil organic matter (SOM) protected within aggregates can be accelerated via priming effect (PE) by the addition of fresh substrates. However, the knowledge of the sources of mineralization and PE in aggregate size classes is absent. We applied the three-source-partitioning isotopic (C-14 + delta C-13) approach to determine how aggregate size classes affect the contribution of three C sources (substrate added, recent and old SOM) to CO2 efflux and PE depending on the amount of added primer. Soil from a field with 3 years of maize cropping (C-4 plants) after long-term C-3 vegetation was used to differentiate between recent C (C-4-C; < 3 years) and old C (C-3 C; >3 years). Soil samples were separated into three aggregate size classes (>2 mm, 2-0.25 mm macroaggregates and <0.25 mm microaggregates) and were incubated for 49 days after being amended with two levels of C-14 labeled glucose. The proportion of glucose mineralized to CO2 increased with decreasing aggregate size, but C-14 incorporation into microbial biomass decreased, indicating higher C use efficiency in macroaggregates compared with microaggregates. The short-time PE was positive and was accompanied by a rapid reduction of dissolved organic C. After 49 days, the PE was higher in macro-versus microaggregates at both glucose levels. Positive PE induced by a low glucose level was observed only in large macroaggregates (>2 mm), but was observed in both macroaggregates (>0.25 mm) and microaggregates (<0.25 mm) after high glucose amendment. These results indicate that SOM pools are more decomposable in macro-versus microaggregates and that the SOM pools are involved in PE according to their biochemical availability. More primed CO2 originated from recent C-4-C than old C-3-C in larger macroaggregates under a low glucose level. The relative contribution of recent C-4-C to primed CO2 increased from macroaggregates (37.8%) to microaggregates (100%) after high glucose amendment. Therefore, increasing glucose addition stimulated the decomposition of old C-3-C in macroaggregates, but not in microaggregates. This indicates that microaggregates protect SOM against decomposition better than macroaggregates, and consequently, microaggregates can be considered as a potential reservoir for longterm C sequestration. Concluding, aggregate size is crucial for SOM decomposition, and it determines the source of PE and thus the protection of sequestrated C. The effects of the added primer on C sources involved in PE depend on the aggregate size. (C) 2016 Elsevier Ltd. All rights reserved."],["dc.identifier.doi","10.1016/j.soilbio.2016.03.013"],["dc.identifier.isi","000375517400021"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/40537"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Pergamon-elsevier Science Ltd"],["dc.relation.issn","0038-0717"],["dc.title","Aggregate size and glucose level affect priming sources: A three-source-partitioning study"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","195"],["dc.bibliographiccitation.journal","Soil Biology and Biochemistry"],["dc.bibliographiccitation.lastpage","203"],["dc.bibliographiccitation.volume","65"],["dc.contributor.author","Tian, Jing"],["dc.contributor.author","Dippold, Michaela"],["dc.contributor.author","Pausch, Johanna"],["dc.contributor.author","Blagodatskaya, Evgenia"],["dc.contributor.author","Fan, Mingsheng"],["dc.contributor.author","Li, Xiaolin"],["dc.contributor.author","Kuzyakov, Yakov"],["dc.date.accessioned","2018-11-07T09:19:42Z"],["dc.date.available","2018-11-07T09:19:42Z"],["dc.date.issued","2013"],["dc.description.abstract","Rhizodeposit-carbon (rhizo-C) serves as a primary energy and C source for microorganisms in the rhizosphere. Despite important progress in understanding the fate of rhizo-C in upland soils, little is known about microbial community dynamics associated with rhizo-C in flooded soils, especially depending on water regimes in rice systems. In this study, rice grown under non-flooded, continuously flooded and alternating water regimes was pulse labeled with (CO2)-C-13 and the incorporation of rhizo-C into specific microbial groups was determined by C-13 in phospholipid fatty acids (PLFAs) at day 2 and 14 after the labeling. A decreased C released from roots under continuously flooded condition was accompanied with lower total C-13 incorporation into microorganisms compared to the non-flooded and alternating water regimes treatments. Continuous flooding caused a relative increase of C-13 incorporation in Gram positive bacteria (i14:0, i15:0, a15:0, i16:0, i17:0, a17:0). In contrast, Gram negative bacteria (16:1 omega 7c, 18:1 omega 7c, cy17:0, cy 19:0) and fungi (18:2 omega 6, 9c, 18:1 omega 9c) showed greater rhizo-C incorporation coupled with a higher turnover under non-flooded and alternating water regimes treatments. These observations suggest that microbial groups processing rhizo-C differed among rice systems with varying water regimes. In contrast to non-flooded and alternating water regimes, there was little to no temporal C-13 change in most microbial groups under continuous flooding condition between day 2 and 14 after the labeling, which may demonstrate slower microbial processing turnover. In summary, our findings indicate that belowground C input by rhizodeposition and its biological cycling was significantly influenced by water regimes in rice systems. (C) 2013 Elsevier Ltd. All rights reserved."],["dc.identifier.doi","10.1016/j.soilbio.2013.05.021"],["dc.identifier.isi","000323686800024"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/28701"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","0038-0717"],["dc.title","Microbial response to rhizodeposition depending on water regimes in paddy soils"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","69"],["dc.bibliographiccitation.journal","Soil Biology and Biochemistry"],["dc.bibliographiccitation.lastpage","78"],["dc.bibliographiccitation.volume","118"],["dc.contributor.author","Ma, Xiaomin"],["dc.contributor.author","Zarebanadkouki, Mohsen"],["dc.contributor.author","Kuzyakov, Yakov"],["dc.contributor.author","Blagodatskaya, Evgenia"],["dc.contributor.author","Pausch, Johanna"],["dc.contributor.author","Razavi, Bahar S."],["dc.date.accessioned","2020-12-10T15:21:21Z"],["dc.date.available","2020-12-10T15:21:21Z"],["dc.date.issued","2018"],["dc.identifier.doi","10.1016/j.soilbio.2017.12.009"],["dc.identifier.issn","0038-0717"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/72998"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Spatial patterns of enzyme activities in the rhizosphere: Effects of root hairs and root radius"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]