Allocation and dynamics of assimilated carbon in rice-soil system depending on water management
Allocation and dynamics of assimilated carbon in rice-soil system depending on water management
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DOI：
10.1007/s11104-012-1327-z
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发表时间：
2013-05
期刊：
影响因子：
4.9
通讯作者：
Jing Tian;J. Pausch;M. Fan;Xiaolin Li;Qiyuan Tang;Y. Kuzyakov
中科院分区：
文献类型：
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作者：
Jing Tian;J. Pausch;M. Fan;Xiaolin Li;Qiyuan Tang;Y. Kuzyakov
AimsThough水资源保护在水稻生产中已变得越来越重要，水管理的影响，分配和动态的碳（C）在水稻-土壤system.MethodsWe内的分配和动态的水稻同化的C连续淹水，非淹水和交替的水制度进行了比较。水稻（Oryza sativeL.）CV.结果在非淹水和交替水分条件下，14 C从根中释放到土壤中的量较多，而14 C从根中释放到土壤中的量较少。微生物14 C标记后随时间的推移而下降，在淹水条件下最低。根系和根系的微生物呼吸作用表现为非淹水处理>交替水分处理>淹水处理。水分管理影响了14 C在团聚体中的分布，在非淹水处理中，14 C在大团聚体中的分布更多。水稻标记后45天的地下C转移量估计为1，986、2，827和2，472 kg C ha−1，其中根沉积约占非淹、淹和交替水分条件下地下C转移量的41%、16%和30%，结论水分管理影响了水稻-土壤系统近期同化碳的分配和动态，改变了根系沉积对地下碳转移的相对贡献。这项研究表明，不同的驱动机制下，C封存淹没与非淹没和交替的水制度。
AimsAlthough 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.MethodsWe compared the allocation and dynamics of C assimilated by rice under continuously flooded, non-flooded and alternate water regimes. Rice (Oryza sativeL. cv. Luliangyou 996) was labeled with14CO2and harvested 7 times within 45 days.ResultsMore14C was released from roots into the soil in non-flooded and alternate water regimes treatments. Microbial14C 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 affected14C distribution in aggregates with more14C 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.ConclusionsWater 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.