生态环境学报2011，Vol.20Issue(6)：1003-1010,8.
DNDC模型对川中丘陵区稻田CH4、N2O排放的模拟对比分析
Research of tillage-cropping systems on CH4 and N2O emission from permanently flooded rice fields in a central Sichuan hilly area of southwest China
摘要
Abstract
Used the high resolution(l m) IKONOS satellite, selected representative of the middle Jintang hilly area feature as the study area. Researched of CH4, and N2O emissions from three kinds of paddy-rice fields- permanently flooded paddy fields (PF), rapeseed-paddy rice fields (RR) and winter wheat-paddy rice fields (RW) from May 2005 to May 2006. Had some detailed fanner investigations, include crop type, tillage, fertilizer, manure type, irrigation, output. And determined and statisticsed soil pH, N concentration in rainfall, meteorological data and so on. The results show that: The average CH4 fluxes from a permanently flooded rice field with a single middle rice crop and flooded with PF were 2.24 kg-nm-2·d-1 and 0.512 kg-hm-·d-1 during rice-growing and non-rice growing periods, respectively. The annual CH4 emission was mainly occurred in the rice growing period, being only 29.27 % of the total annual CH4 flux emitted from the non-rice growing period, though the latter occupied two thirds of a year. The annual average flux of nitrous oxide was 0.014 kghm-2·d-1. N2O emission also intensive in the rice growing period. However, being only 16.41 % of total annual N2O flux emitted from the non-rice growing period. There was a clear trade-off between CH4 and N2O emission in paddy fields during the growth period of paddy-rice. CH4 emission flux in rice growth stage of RR was 1.16 kg-hm-2-d-1, it was 20.71 times of leisure period. CH4 emissions of rice growth stage account for the total emissions was 90.48%. N2O emission flux in rice growth stage and leisure period of RR were 0.070 and 0.027 kghm-2·d-1, respectively. N2O emissions of rice growth stage account for the total emissions was 54.19%. CH4 emission flux in rice growth stage of RW was 1.24 kg-hm-2·d-1, it was 21.02 times of leisure period. CH4 emission of rice growth stage account for the total emissions of RW was 89.75%. N2O emission flux in rice growth stage and leisure period of RW were 0.089 and 0.030 kg·hm-2·d-1, respectively. N2O emissions of rice growth stage account for the total emissions was 55.23%. CH4 emissions of PF was nearly 3 times of RR and RW, and less one season of crop yields. Should as far as possible to change PF to RR and RW.关键词
DNDC模型/稻田/CH4排放/N2O排放Key words
DNDC model/rice fields/CR4 emission/N2O emission分类
资源环境引用本文复制引用
孙园园,孙永健,王锐婷,冯建东,李春露,马均,李首成..DNDC模型对川中丘陵区稻田CH4、N2O排放的模拟对比分析[J].生态环境学报,2011,20(6):1003-1010,8.基金项目
国家科技支撑计划重大项目(2011BAD16B05) （2011BAD16B05）
中国气象局西南区域重大科研业务项目(2010-7) （2010-7）
四川省教育厅项目(10ZA047) （10ZA047）
四川现代农业产业技术体系建设项目 （）
