文献类型：期刊文献

英文题名：Elevated CO2 facilitates C and N accumulation in a rice paddy ecosystem

作者：Guo, Jia[1,2] Zhang, Mingqian[2,3] Wang, Xiaowen[1,4] Zhang, Weijian[2,5]

第一作者：郭嘉;Guo, Jia

通信作者：Wang, XW[1]

机构：[1]Chinese Acad Forestry, Inst Wetland Res, Beijing 100091, Peoples R China;[2]Nanjing Agr Univ, Inst Appl Ecol, Nanjing 210095, Jiangsu, Peoples R China;[3]China Tobacco Fujian Ind Co Ltd, Ctr Technol, Xiamen 361021, Peoples R China;[4]Chinese Acad Engn, Beijing 100088, Peoples R China;[5]Chinese Acad Agr Sci, Inst Crop Sci, Key Lab Crop Ecol Physiol & Prod, Minist Agr, Beijing 100081, Peoples R China

年份：2015

卷号：29

起止页码：27-33

外文期刊名：JOURNAL OF ENVIRONMENTAL SCIENCES

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000352181300004)】；

基金：This work was supported by the National Natural Science Foundation of China (No. 31200369), and the Lecture and Study Program for Outstanding Scholars from Home and Abroad, Chinese Academy of Forestry (CAFYBB2011007). We are grateful to Dr. Hu Shuijin in the Department of Plant Pathology, North Carolina State University for his constructive suggestions for this research, and Dr. Zhu Jianguo and Dr. Xie Zhubin in the Institute of Soil Science, Chinese Academy of Sciences, China, for their great comments on this investigation.

语种：英文

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

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.