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地膜覆盖对稻-油轮作农田CH4和N2O排放的影响
引用本文:石将来,郝庆菊,冯迪,张凯莉,石孝均,江长胜.地膜覆盖对稻-油轮作农田CH4和N2O排放的影响[J].环境科学,2017,38(11):4790-4799.
作者姓名:石将来  郝庆菊  冯迪  张凯莉  石孝均  江长胜
作者单位:西南大学资源环境学院, 三峡库区生态环境教育部重点实验室, 重庆 400716,西南大学资源环境学院, 三峡库区生态环境教育部重点实验室, 重庆 400716,西南大学资源环境学院, 三峡库区生态环境教育部重点实验室, 重庆 400716,西南大学资源环境学院, 三峡库区生态环境教育部重点实验室, 重庆 400716,西南大学资源环境学院, 三峡库区生态环境教育部重点实验室, 重庆 400716;国家紫色土肥力与肥料效益监测基地, 重庆 400716,西南大学资源环境学院, 三峡库区生态环境教育部重点实验室, 重庆 400716
基金项目:国家自然科学基金项目(41275160,40975095);中央高校基本科研业务费专项(XDJK2015A013,XDJK2013A009)
摘    要:以位于西南大学农业部重庆紫色土生态环境重点野外科学观测试验站内的稻-油轮作农田为研究对象,采用静态暗箱/气相色谱法,对覆膜与常规(不覆膜)两种处理下稻-油轮作农田CH_4和N_2O的排放特征及影响因素进行了为期一年的原位观测.结果表明,两种处理下,CH_4和N_2O的排放均主要集中在各作物的生长前期,水稻季CH_4和油菜季N_2O的排放通量均具有较明显的季节变化;全年CH_4的排放通量介于-0.45~1.90 mg·(m~2·h)~(-1),N_2O的排放通量介于-46.1~2 040.7μg·(m~2·h)~(-1).地膜覆盖提高了CH_4和N_2O排放总量,其中覆膜处理全年CH_4排放总量为(27.22±4.48)kg·hm~(-2),相比常规处理(19.93±0.56)kg·hm~(-2)提高了26.22%;覆膜处理N_2O的年排放总量为(13.14±0.82)kg·hm~(-2),较常规处理下(11.27±2.77)kg·hm~(-2)增加了16.6%.覆膜显著提高了油菜季土壤含水率,而对全年各作物季土壤温度(地下5 cm温度和地表温度)没有明显的影响.覆膜处理下油菜季CH_4和N_2O的排放与土壤含水率呈负相关,幼苗期达显著负相关;两种处理下,各作物季CH_4和N_2O的排放与土壤温度的相关性均很小.研究表明,地膜覆盖影响作物各生育期内CH_4和N_2O的排放规律,改变了作物各生育期内2种气体排放占全季排放量的比例,促进了稻-油轮作农田CH_4和N_2O的排放.在100 a时间尺度上,覆膜处理下全年排放的CH_4和N_2O所引起的综合GWP(CO_2量)为4 213.00 kg·hm~(-2),较常规处理3 454.17 kg·hm~(-2)提高了22.0%,表明覆膜不是一种有效的碳减排措施.

关 键 词:地膜覆盖  稻-油轮作  CH4  N2O  排放通量  全球增温潜势(GWP)
收稿时间:2016/12/28 0:00:00
修稿时间:2017/6/5 0:00:00

Effects of Plastic Film Mulching on Methane and Nitrous Oxide Emissions from a Rice-Rapeseed Crop Rotation
SHI Jiang-lai,HAO Qing-ju,FENG Di,ZHANG Kai-li,SHI Xiao-jun and JIANG Chang-sheng.Effects of Plastic Film Mulching on Methane and Nitrous Oxide Emissions from a Rice-Rapeseed Crop Rotation[J].Chinese Journal of Environmental Science,2017,38(11):4790-4799.
Authors:SHI Jiang-lai  HAO Qing-ju  FENG Di  ZHANG Kai-li  SHI Xiao-jun and JIANG Chang-sheng
Institution:Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, College of Resources and Environment, Southwest University, Chongqing 400716, China,Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, College of Resources and Environment, Southwest University, Chongqing 400716, China,Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, College of Resources and Environment, Southwest University, Chongqing 400716, China,Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, College of Resources and Environment, Southwest University, Chongqing 400716, China,Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, College of Resources and Environment, Southwest University, Chongqing 400716, China;National Monitoring Station of Soil Fertility and Fertilizer Efficiency on Purple Soils, Chongqing 400716, China and Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, College of Resources and Environment, Southwest University, Chongqing 400716, China
Abstract:
Keywords:plastic film mulching  rice-rapeseed rotation  CH4  N2O  emission flux  global warming potential(GWP)
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