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OALib Journal期刊
ISSN: 2333-9721
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太岳山油松人工林干湿交替时期土壤呼吸特征
DOI: 10.3724/SP.J.1145.2012.00904, PP. 904-910
Keywords: 干湿交替,土壤呼吸速率,土壤温度,土壤容积含水量,油松人工林,太岳山
Abstract:
为了解在温度升高和干湿交替的复合影响下森林生态系统土壤呼吸的动态特征，以太岳山地区油松人工林土壤为研究对象，应用li-8150土壤co2通量全自动连续测量系统原位、全天候、高频率地连续监测土壤呼吸速率及环境因子，基于原始数据、小时均值数据和日均值数据3种研究尺度，利用已有的单因子模型、双因子模型对土壤呼吸速率与5cm土壤温度和容积含水量的关系进行了拟合.结果表明：（1）在太岳山地区的干湿交替时期，降雨总体上促进了油松人工林的土壤呼吸；土壤呼吸速率和5cm土壤容积含水量的小时动态规律非常相似；5cm土壤容积含水量存在明显的消长，5cm土壤温度在波动中整体上升，两个土壤环境因子之间存在负相关关系（r=-0.37，r2=0.30，p<0.01）.（2）不同的研究尺度下，日均值数据拟合模型的效果最好，小时均值数据次之，原始数据最差.（3）相同的研究尺度下，双因子模型优于单因子模型，非线性模型要优于线性模型.综上所述，太岳山油松人工林土壤呼吸对该地区干湿交替现象的响应明显，所拟合的模型中，日均值数据尺度下的双因子指数-幂函数模型的解释力最好.图1表4参33
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