Elevated CO2 facilitates C and N accumulation in a rice paddy ecosystem

文献类型： 外文期刊

第一作者： Guo, Jia

作者： Guo, Jia;Wang, Xiaowen;Guo, Jia;Zhang, Mingqian;Zhang, Weijian;Zhang, Mingqian;Wang, Xiaowen;Zhang, Weijian

作者机构：

关键词： Free-air CO2 enrichment (FACE);Wetland ecosystem;Paddy field;Carbon (C);Nitrogen (N)

期刊名称：JOURNAL OF ENVIRONMENTAL SCIENCES （ 影响因子：5.565； 五年影响因子：5.066 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： Elevated CO2 can stimulate wetland carbon (C) and nitrogen (N) exports through gaseous and dissolved pathways, however, the consequent influences on the C and N pools are still not fully known. Therefore, we set up a free-air CO2 enrichment experiment in a paddy field in Eastern China. After five year fumigation, we studied C and N in the plant-water-soil system. The results showed: (1) elevated CO2 stimulated rice aboveground biomass and N accumulations by 19.1% and 12.5%, respectively. (2) Elevated CO2 significantly increased paddy soil TOC and TN contents by 12.5% and 15.5%, respectively in the 0-15 cm layer, and 22.7% and 26.0% in the 15-30 cm soil layer. (3) Averaged across the rice growing period, elevated CO2 greatly increased TOC and TN contents in the surface water by 7.6% and 11.4%, respectively. (4) The TOC/TN ratio and natural delta 15N value in the surface soil showed a decreasing trend under elevated CO2. The above results indicate that elevated CO2 can benefit C and N accumulation in paddy fields. Given the similarity between the paddies and natural wetlands, our results also suggest a great potential for long-term C and N accumulation in natural wetlands under future climate patterns. (C) 2015 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences.

分类号： X5

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