基于DNDC模型的川中丘陵区不同轮作制度下稻田CO_2排放研究  

Simulation of CO_2 Emission from Rice Fields under Different Cropping Systems in Central Sichuan Hilly Area with DCDC Model

作　　者：孙园园[1,2,3] 孙永健[3] 王锐婷[2] 冯建东[2] 李春露 马均[3] 李首成[3] 

机构地区：[1]中国气象局成都高原气象研究所,成都610072 [2]四川省农业气象中心,成都610072 [3]四川农业大学农学院,温江611130 [4]四川省农网中心,成都610072

出　　处：《中国农业气象》2011年第4期530-537,共8页Chinese Journal of Agrometeorology

基　　金：国家科技支撑计划重大项目(2011BAD16B05);中国气象局西南区域重大科研业务项目(2010-7);四川省教育厅项目(10ZA047);四川现代农业产业技术体系建设项目

摘　　要：利用IKONOS高分辨率(1m)卫星遥感图,选定代表川中丘陵区特征的四川省金堂县为研究区域,选取冬水田-水稻田(PF)、油菜-水稻田(RR)和小麦-水稻田(RW)3种主要轮作制度下353块稻田为研究对象,于2005年5月-2006年5月对作物田间管理、作物产出、土壤理化性状及施肥情况,以及水质与气象等基础资料进行调查、测定和统计分析,利用DNDC模型模拟川中丘陵区不同轮作制度下稻田CO2排放情况。结果表明:PF、RR和RW 3种轮作制度下CO2年总排放量分别为:4102、7512和8111kg.hm-2,且RW和RR均显著高于PF,但3种轮作制度下单季作物的CO2排放量差异不大,RR处理的单季作物的CO2排放量最小,其年总作物产量居中,RW处理产量最高。PF水稻生长期和休闲期CO2排放通量分别为25.48和3.36kg.hm-2.d-1,水稻生长期是休闲期的7.58倍;RR和RW在水稻生长期CO2排放通量平均为23.32和25.21kg.hm-2.d-1,低于PF水稻生长期CO2排放通量,但差异未达到显著水平,而RR和RW非水稻生长期的CO2排放通量分别为19.34和20.96kg.hm-2.d-1,分别为PF休闲期的5.76和6.24倍。根际呼吸是土壤呼吸的主要部分,整个生长期PF、RR、RW的根呼吸贡献率平均为59.14%～62.96%。CO2 emission from rice fields under different rotation system,including flooded paddy fields to paddy to rice fields（PF）,rapeseed to paddy rice fields（RR） and winter wheat to paddy rice fields（RW）,was simulated by using DNDC model,based on the high resolution（1m） IKONOS satellite.The experiment was conducted from May 2005 to May 2006 in Jintang county,Sichuan province,a typical hilly area.The results showed that annual total flux CO2 emission from PF,RR and RW was 4102,7512 and 8111 kg·ha-1,respectively.But the flux of CO2emission for one-cropping among the treatments was not significantly different.The total yield of RW was highest,followed by RR.Both of them was higher significant than PF.The flux of CO2emission was 25.48 and 3.36 kg·ha-1·d-1 during rice growing season and non-growing season for PF.The flux of CO2emission was 23.32 and 25.21 kg·ha-1·d-1 during rice growing season for RR and RW,and 19.34 and 20.96 kg·ha-1·d-1 during non-growing seasonrespectively.Root respiratory was the main soil respiratory,which contributed to 59.14%-62.96% during the whole growth season for RR,RW,and PF.

关 键 词：DNDC模型 轮作制度 稻田 CO2排放 

分 类 号：X511[环境科学与工程—环境工程] S511[农业科学—作物学]