Microbial response to rhizodeposition depending on water regimes in paddy soils

By Jing Tian, M. Dippold, J. Pausch, E. Blagodatskaya, M. Fan, Xiaolin Li, Y. Kuzyakov. 2013

90 citations recorded by the source corpus.

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 13 CO 2 and the incorporation of rhizo-C into specific microbial groups was determined by 13 C 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 13 C incorporation into microorganisms compared to the non-flooded and alternating water regimes treatments. Continuous flooding caused a relative increase of 13 C incorporation in Gram positive bacteria (i14:0, i15:0, a15:0, i16:0, i17:0, a17:0). In contrast, Gram negative bacteria (16:1ω7c, 18:1ω7c, cy17:0, cy 19:0) and fungi (18:2ω6, 9c, 18:1ω9c) 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 13 C 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.

Subfields: Plant Science, Soil Science

View Paper: https://www.semanticscholar.org/paper/d27f0faff10116ad757c40ee9d617cc22a7c34d4

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In Plant Science

1. Y. Kuzyakov
2. E. Blagodatskaya
3. A. Gunina
4. M. Dippold
5. B. Glaser
6. J. Pausch
7. B. Razavi
8. W. Cheng

In Soil Science

1. Y. Kuzyakov
2. A. Gunina
3. E. Blagodatskaya
4. M. Dippold
5. B. Glaser
6. J. Pausch
7. B. Razavi
8. W. Cheng

Citations in the corpus

• Fate of low molecular weight organic substances in an arable soil: From microbial uptake to utilisation and stabilisation (2014, background): “, 2003) or G bacteria (Tian et al., 2013) are the most active consumers of rhizodeposits.”
• Active microorganisms in soil: Critical review of estimation criteria and approaches (2013, background): “Despite small changes in total PLFA content, the higher contribution of 13C in specific PLFAs indicated the presence of microbial groups active in the rhizosphere (Denef et al., 2009; Tian et al., 2013).”