Abstract
Aims
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.
Methods
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 14CO2 and harvested 7 times within 45 days.
Results
More 14C was released from roots into the soil in non-flooded and alternate water regimes treatments. Microbial 14C 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 14C distribution in aggregates with more 14C 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.
Conclusions
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.
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Abbreviations
- SOC:
-
Soil organic carbon
- SOM:
-
Soil organic matter
- TN:
-
Soil total nitrogen
- DOC:
-
Dissolved organic carbon
- MBC:
-
Microbial biomass carbon
- WHC:
-
Water holding capacity
- F:
-
Continuously flooded
- NF:
-
Non-flooded
- AWD:
-
Alternate wetting and drying
- C- carbon:
-
CO2- carbon dioxide
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Acknowledgments
We thank Prof. JC Yang for his kind help about suggestion during growing the rice. We also thank the three anonymous reviewers for their helpful comments that helped us to greatly improve the manuscript. We thank the Major State Basic Research Development Programmer of the People’s Republic of China (Grant No. 2011CB100505), the National Natural Science Foundation of China (Grant No. 41171195), the Innovative Group Grant of the National Science of Foundation of China (Grant No. 311210620) for generous financial support. The authors also thank China Scholarship Council for providing fund to Jing Tian to pursue her study in Germany.
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Tian, J., Pausch, J., Fan, M. et al. Allocation and dynamics of assimilated carbon in rice-soil system depending on water management. Plant Soil 363, 273–285 (2013). https://doi.org/10.1007/s11104-012-1327-z
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DOI: https://doi.org/10.1007/s11104-012-1327-z