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中国东北区淡水沼泽湿地N2O和CH4排放通量及主导因子 被引量:15

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摘要 在中国东北三江平原沼泽湿地分布区(47°35′N,133°31′E)内选择相邻的地表积水特征分别为季节性积水(SW)和地表常年无积水(NW)的小叶章(Calamagrostis angustifolia)湿地作为研究对象,于2002~2004年采用静态箱法监测了湿地系统内氧化亚氮(N2O)和甲烷(CH4的排放状况.结果表明,两种温室气体的日变化与季节变化与5cm地温显著相关.生长季期内,NW湿地表现为N2O的源和CH4的汇,而SW湿地为N2O的汇和CH4的源.土壤氧化还原电位(Eh)在200~400mV之间有利于N2O排放,而在-300~?100mV之间有利于CH4排放值得注意的是,分别在Eh值-300~-100mV和300~400mV观测到N2O和CH4的另一排放峰值,说明土壤中必然存在其他影响源决定着7,8月份N2O和CH4排放峰值;进一步研究证明,因融化而致使冻层下累积的N2O和CH4集中释放是生长季N2O和CH4这一排放峰值的主要来源.
出处 《中国科学(D辑)》 CSCD 北大核心 2009年第2期177-187,共11页 Science in China(Series D)
基金 中国科学院百人计划、国家自然科学基金项目(批准号:40873062,40803023) 中国科学院知识创新工程项目(编号:KZCX2-YW-309,KZCX3-SW-332)资助
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