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艾比湖地区土壤呼吸对季节性冻土厚度变化的响应/Responses of soil respiration to changes in depth of seasonal frozen soil in Ebinur Lake area, arid area of Northwest China[J]
Authors
中国科学院新疆生态与地理研究所,乌鲁木齐830011
何学敏
+10 more
华东师范大学环境科学与技术系,上海200241
吕光辉
孙景鑫
张雪妮
张雪梅
新疆大学资源与环境科学学院,乌鲁木齐830046
新疆绿洲生态教育部重点实验室,乌鲁木齐830046
李尝君
杨晓东
秦璐
Publication date
1 January 2013
Publisher
Abstract
利用LI-8100土壤CO2排放通量全自动测量系统,于2010年1-4月测定了艾比湖地区不同植被类型样地的土壤呼吸速率,结合环境因子、冻土厚度及室内土壤理化性质分析,探讨了温带干旱区季节性冻土厚度变化对土壤呼吸的影响.结果表明:土壤温度在冻结期是影响冻土厚度的最主要环境因子,而解冻期冻土厚度变化与土壤温度等环境因子关系不显著(P>0.05);冻土厚度在不同时期影响土壤呼吸速率的程度不同,冻结期两者呈显著正相关(R2=0.782,P<0.05),解冻初期两者呈弱相关(P>0.05);土壤呼吸速率在土壤冻结期与解冻初期不存在显著差异(P>0.05),但在解冻完全期则表现出明显的增加趋势(差值为0.14-0.37 μmol· m-2·s-1),表明冻土融化会明显地增加土壤碳排放,从而增加大气中的CO2.结果阐明了艾比湖地区季节性冻土厚度变化对土壤呼吸的影响,为揭示全球变暖背景下冻土退化过程中的碳释放机理提供理论基础
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Institutional Repository of Xinjiang Institute of Ecology and Geography, CAS
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Last time updated on 29/11/2016