文献类型：期刊文献

中文题名：Elevated CO_2 facilitates C and N accumulation in a rice paddy ecosystem

英文题名：Elevated CO_2 facilitates C and N accumulation in a rice paddy ecosystem

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

第一作者：郭嘉;Jia Guo

机构：[1]Institute of Wetland Research, Chinese Academy of Forestry;[2]Institute of Applied Ecology, Nanjing Agricultural University;[3]Technology Center of China Tobacco Fujian Industrial Co., Ltd.;[4]Chinese Academy of Engineering;[5]Institute of Crop Science, Chinese Academy of Agricultural Sciences/Key Laboratory of Crop Ecology, Physiology & Production, Ministry of Agriculture

年份：2015

期号：3

起止页码：27-33

中文期刊名：环境科学学报：英文版

收录：CSTPCD;;Scopus;CSCD:【CSCD2015_2016】；PubMed;

基金：supported by the National Natural Science Foundation of China (No. 31200369);the Lecture and Study Program for Outstanding Scholars from Home and Abroad, Chinese Academy of Forestry (CAFYBB2011007)

语种：英文

中文关键词：大气CO2浓度升高;稻田生态系统;氮积累;高浓度CO2;CO2浓度增高;自然湿地;碳;地上生物量

外文关键词：Free-air CO2 enrichment （FACE）Wetland ecosystemPaddy fieldCarbon （C）Nitrogen （N）

分类号：S718.512;S511

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, and22.7% 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 δ15N 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.
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 crn 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 5ISN 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.