Pausch, Johanna

[["dc.bibliographiccitation.firstpage","273"],["dc.bibliographiccitation.issue","1-2"],["dc.bibliographiccitation.journal","Plant and Soil"],["dc.bibliographiccitation.lastpage","285"],["dc.bibliographiccitation.volume","364"],["dc.contributor.author","Pausch, Johanna"],["dc.contributor.author","Tian, Jing"],["dc.contributor.author","Riederer, Michael"],["dc.contributor.author","Kuzyakov, Yakov"],["dc.date.accessioned","2018-11-07T09:27:56Z"],["dc.date.available","2018-11-07T09:27:56Z"],["dc.date.issued","2013"],["dc.description.abstract","Rhizodeposition of plants is the most uncertain component of the carbon (C) cycle. By existing approaches the amount of rhizodeposition can only roughly be estimated since its persistence in soil is very short compared to other organic C pools. We suggest an approach to quantify rhizodeposition at the field scale by assuming a constant ratio between rhizodeposited-C to root-C. Maize plants were pulse-labeled with (CO2)-C-14 under controlled conditions and the soil (CO2)-C-14 efflux was separated into root and rhizomicrobial respiration. The latter and the C-14 activity remaining in the soil corresponded to total rhizodeposition. By relating rhizodeposited-C-14 to root-C-14 a rhizodeposition-to-root ratio of 0.56 was calculated. This ratio was applied to the root biomass C measured in the field to estimate rhizodeposition under field conditions. Maize allocated 298 kg C ha(-1) as root-C and 166 kg C ha(-1) as rhizodeposited-C belowground, 50 % of which were recovered in the upper 10 cm. The fate of rhizodeposits was estimated based on the C-14 data, which showed that 62 % of total rhizodeposition was mineralized within 16 days, 7 % and 0.3 % was incorporated into microbial biomass and DOC, respectively, and 31 % was recovered in the soil. We conclude that the present approach allows for an improved estimation of total rhizodeposition, since it accounts not only for the fraction of rhizodeposits remaining in soil, but also for that decomposed by microorganisms and released from the soil as CO2."],["dc.description.sponsorship","German Research Foundation (DFG) within the Research Unit"],["dc.identifier.doi","10.1007/s11104-012-1363-8"],["dc.identifier.isi","000314722800023"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/10372"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/30656"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","0032-079X"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","Estimation of rhizodeposition at field scale: upscaling of a C-14 labeling study"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","273"],["dc.bibliographiccitation.issue","1-2"],["dc.bibliographiccitation.journal","Plant and Soil"],["dc.bibliographiccitation.lastpage","285"],["dc.bibliographiccitation.volume","363"],["dc.contributor.author","Tian, Jing"],["dc.contributor.author","Pausch, Johanna"],["dc.contributor.author","Fan, Mingsheng"],["dc.contributor.author","Li, Xiaolin"],["dc.contributor.author","Tang, Qiyuan"],["dc.contributor.author","Kuzyakov, Yakov"],["dc.date.accessioned","2018-11-07T09:28:47Z"],["dc.date.available","2018-11-07T09:28:47Z"],["dc.date.issued","2013"],["dc.description.abstract","Although water conservation in rice production has become increasingly important, the effects of water management on the allocation and dynamics of carbon (C) within the rice-soil system remain unknown. We compared the allocation and dynamics of C assimilated by rice under continuously flooded, non-flooded and alternate water regimes. Rice (Oryza sative L. cv. Luliangyou 996) was labeled with (CO2)-C-14 and harvested 7 times within 45 days. More C-14 was released from roots into the soil in non-flooded and alternate water regimes treatments. Microbial C-14 decreased with time after the labeling and was lowest under flooded condition. Roots and rhizomicrobial respiration followed the order of non-flooded > alternate water regimes > flooded treatment. Water management affected C-14 distribution in aggregates with more C-14 in macroaggregates in the non-flooded treatment. Estimated amounts of C transferred remaining belowground by rice 45 days after labeling were 1,986, 2,827 and 2,472 kg C ha(-1), of which rhizodeposition accounted for about 41 %, 16 % and 30 % of C transferred belowground under non-flooded, flooded and alternate water regimes, respectively. Water management affected the allocation and dynamics of recently assimilated C within the rice-soil system and also changed the relative contribution of rhizodeposition to C transferred belowground. This study suggests the differences in the driving mechanisms of C sequestration under flooded vs. non-flooded and alternate water regimes."],["dc.identifier.doi","10.1007/s11104-012-1327-z"],["dc.identifier.isi","000313729000021"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/30863"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","0032-079X"],["dc.title","Allocation and dynamics of assimilated carbon in rice-soil system depending on water management"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1242"],["dc.bibliographiccitation.journal","Science of The Total Environment"],["dc.bibliographiccitation.lastpage","1252"],["dc.bibliographiccitation.volume","627"],["dc.contributor.author","Gavrichkova, Olga"],["dc.contributor.author","Liberati, Dario"],["dc.contributor.author","de Dato, Giovanbattista"],["dc.contributor.author","Abou Jaoudé, Renée"],["dc.contributor.author","Brugnoli, Enrico"],["dc.contributor.author","de Angelis, Paolo"],["dc.contributor.author","Guidolotti, Gabriele"],["dc.contributor.author","Pausch, Johanna"],["dc.contributor.author","Spohn, Marie"],["dc.contributor.author","Tian, Jing"],["dc.contributor.author","Kuzyakov, Yakov"],["dc.date.accessioned","2020-12-10T15:21:12Z"],["dc.date.available","2020-12-10T15:21:12Z"],["dc.date.issued","2018"],["dc.identifier.doi","10.1016/j.scitotenv.2018.01.311"],["dc.identifier.issn","0048-9697"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/72946"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Effects of rain shortage on carbon allocation, pools and fluxes in a Mediterranean shrub ecosystem – a 13C labelling field study"],["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","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"]]