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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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近45年青藏高原土壤温度的变化特征分析
DOI: 10.11821/xb200811004, PP. 1151-1159
Keywords: 青藏高原,土壤温度,温度梯度,多年冻土
Abstract:
利用青藏高原60个气象站1960-2005年的土壤温度观测资料，采用Mann-Kendall法和功率谱方法对不同深度土壤温度的时间变化进行趋势突变和周期检验，并以主成分方法考察其空间分布特征。分析结果发现青藏高原浅层土壤温度自1970年以来升高趋势明显，1969-1970年为明显的突变点；40~320cm的深层土壤温度存在3.25年的显著周期变化；浅层土壤温度空间特征则主要体现为全区一致型和南北反向变化型。同时以浅层土壤温度梯度(10~20cm)的变化特征讨论了青藏高原地气间能量的交换关系以及浅层土壤温度梯度对高原多年冻土的响应，认为高原地气温差和浅层土壤温度梯度之间存在一种涨落机制，体现的是高原地气间的耗散结构关系；而浅层土壤温度梯度分布特征对高原多年冻土有明显的响应。
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