Responses of dissolved organic carbon and dissolved nitrogen in surface water and soil to CO2 enrichment in paddy field

文献类型： 外文期刊

第一作者： Deng, Aixing

作者： Deng, Aixing;Zhang, Weijian;Guo, Jia;Zhang, Mingqian;Zhang, Li;Bian, Xinmin;Zhang, Weijian;Zhu, Jianguo

作者机构：

关键词： Global climate change;Paddy field;Dissolved organic carbon;Dissolved nitrogen;Free-air CO2 enrichment;Wetland

期刊名称：AGRICULTURE ECOSYSTEMS & ENVIRONMENT （ 影响因子：5.567； 五年影响因子：6.064 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： a- Elevated CO2 increases DOC and DN contents in the surface water of paddy field. a- Elevated CO2 increases DOC but decreases DN contents in paddy surface soil. a- Elevated CO2 may increase dissolved C and N exports from paddy ecosystem. Increasing evidences have shown that dissolved organic components are responsible for the significant C and N exports from terrestrial ecosystems to the surrounding aquatic ecosystems and very sensitive to CO2 enrichment. However, there is still a lack of direct evidence about CO2-led effects on these components at the ecosystem scale, especially in wetlands. We, therefore, simultaneously investigated the contents of dissolved organic carbon (DOC) and dissolved nitrogen (DN) in the surface water and soil layer in a paddy field under FACE facility in Eastern China. Elevated CO2 significantly increased the contents of DOC and DN in the surface water by 18.0% and 14.3% on average. Elevated CO2 also increased DOC content in the soil, but decreased DN content. The contents of DOC and DN in the soil-water interface of 0-1cm soil layer were on average 22.4% and 47.5% higher than in the 5-15cm soil layer. Besides, significant higher DOC and DN contents existed in the soil porewater than in the surface water. Due to multiple drainage regime and rainstorm-induced runoffs in rice cropping regions, CO2-led DOC and DN increments in the surface water may increase C and N exports from paddies to the surrounding aquatic ecosystems under future climate patterns.

分类号： S

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