Biological carbon assimilation and dynamics in a flooded rice - Soil system

By T. Ge, Hongzhao Yuan, Han-hua Zhu, Xiaohong Wu, S. Nie, Chang Liu, C. Tong, Jinshui Wu, P. Brookes. 2012

132 citations recorded by the source corpus.

14 continuous labelling abstract Information on the input, distribution and fate of photosynthesized carbon (C) in plantesoil systems is essential for understanding their nutrient and C dynamics. Our objectives were to: 1) quantify the input to, and distribution of, photosynthesized C byriceintoselected soil Cpools byusing aC 14 continuous labelling technique and 2) determine the influence of the photosynthesized C input on the decomposition of native soil organic carbon (SOC) under laboratory conditions. The amounts of C 14 in soil organic C (SOC 14 ) were soil dependent, and ranged from 114.3 to 348.2 mg C kg � 1 , accounting for 0.73%e1.99% of total SOC after continuous labelling for 80 days. However, the mean SOC 14 concentrations in unplanted soils (31.9 e64.6 mg kg � 1 ) were accounted for 21.5% of the rice-planted soils. The amounts of C 14 in the dissolved organic C (DOC 14 ) and in the microbial biomass C (MBC 14 ), as percentages of SOC 14 , were 2.21%e3.54% and 9.72%e17.97%, respectively. The DOC 14 and MBC 14 were 6.72%e14.64% and 1.70%e7.67% of total DOC and MBC respectively after 80-d of rice growth. At 80-d of labelling, the SOC 14 concentration was positively correlated with the MBC 14 concentration and rice root biomass. Rice growth promotes more photo- synthesized (newly-derived) C into soil C pools compared to unplanted soils, reflecting the release of root exudates from rice roots. Laboratory incubation of photosynthesized (plant-derived) C in soil decreased the decomposition of native SOC (i.e. a negative priming effect), in some, but not all cases. If this negative priming effect of the new C on native SOC also occurs in the field in the longer term, paddy soils will probably sequester more C from the atmosphere if more photosynthesized C enters them.

Subfields: Ecology, Environmental Chemistry, Soil Science

View Paper: https://www.semanticscholar.org/paper/fdd0d2bf1a5f8fc012b336caf16dbbdf0592e670

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Ecology

1. Y. Kuzyakov
2. E. Blagodatskaya
3. J. Pausch
4. M. Dippold
5. A. Gunina
6. C. Nguyen

In Environmental Chemistry

1. J. Pausch
2. Y. Kuzyakov
3. E. Blagodatskaya
4. M. Dippold
5. C. Nguyen

In Soil Science

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

Citations in the corpus

• Microbial response to rhizodeposition depending on water regimes in paddy soils (2013, background): “Only a few studies have evaluated the rhizo-C utilization by microorganisms in flooded rice systems (Lu et al., 2004; Wu et al., 2009; Ge et al., 2012), especially there is only one study that was related to water status (Yao et al., 2012).”