OALib Journal期刊
ISSN: 2333-9721
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气候变化及人类活动对中国土壤有机碳储量的影响
DOI: 10.11821/xb200305011, PP. 727-734
Keywords: 土壤有机碳储量,气候,人类活动,偏相关,耕地,中国
Abstract:
对中国1998年第二次土壤普查中的2000多个土壤剖面中碳储量与年平均温度(T)、年降水量(P)的相关性研究表明它们之间的相关性在不同的温度带下具有很大的差异,在T≤10oC的地区,土壤有机碳储量与温度的负相关性最强;在10oC20oC的地区,土壤有机碳储量与温度和降水的相关性都很差。由于温度和降水在中国存在很强的正相关性,因此在相关分析中宜采用偏相关分析方法。受人类耕种的影响,耕地土壤有机碳储量与温度、降水相关性远低于非耕地土壤。对具有相同土壤属性和气候条件的同一地区的耕地土壤与非耕地土壤样本进行的配对检验表明,耕地土壤与非耕地土壤有机碳储量之间存在显著差异,土地利用的改变在总体上导致了土壤碳的释放。
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