Effect on greenhouse gas balance of converting rice paddies to vegetable production

作     者：Lei Wu Xian Wu Ronggui Hu 

作者机构：College of Resources and Environment Huazhong Agricultural University Wuhan 430070 China 

出 版 物：《Acta Geochimica》 (地球化学学报（英文）)

年 卷 期：2017年第36卷第3期

页      面：353-354页

核心收录：

学科分类：080706[工学-化工过程机械] 08[工学] 09[农学] 0807[工学-动力工程及工程热物理] 0902[农学-园艺学] 090202[农学-蔬菜学] 

主　　题：Greenhouse gas balance Land management change CH4 N2O Soil organic carbon 

摘      要：Rice paddies are increasingly being converted to vegetable production due to economic benefits related,in part,to changes in demand during recent ***,we implemented a parallel field experiment to simultaneously measure annual emissions of CH_4and N_2O,and soil organic carbon(SOC)stock changes,in rice paddies(RP),rice paddy–converted conventional vegetable fields(CV),and rice paddy–converted greenhouse vegetable fields(GV).Changing from rice to vegetable production reduced CH_4emissions by nearly 100%,and also triggered substantial N_2O ***,annual N_2O emissions from GV significantly exceeded those from CV due to lower soil p H and higher soil *** SOC losses occurred after one year of cultivation of RP,CV,and GV,contributing an important share(3.4%,32.2%,and 10.3%,respectively)of the overall global warming potential(GWP)*** decline in CH_4emissions outweighed the increased N_2O emissions and SOC losses in CV and GV,leading to a 13%–30%reduction in annual GWP as compared to *** results suggest that large-scale expansion of vegetable production at the expense of rice paddies is beneficial for mitigating climate change in terms of the overall GWP.