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利用沿土壤深度方向的垂直滞后空间相关系数和经验正交函数分解方法研究了新疆艾比湖流域土壤有机质含量的垂直空间分布结构。结果表明:垂直滞后空间相关系数和经验正交函数分解方法能够有效分析空间区域土壤有机质垂直分布的相关性和空间异质性;垂直滞后空间正相关或负相关的集聚区域指示了相似或相反的有机质垂直分布模式,并且土壤有机质含量相关性随土层深度间隔增大而衰减;流域不同区域土壤有机质沿土层深度的垂直分布呈现分异特征,流域东部和西部地区有机质含量随土层深度增加而升高,但中部区域有机质含量随土层加深而降低,而且土壤有机质含量沿垂直方向递增或递减的速率在流域内亦表现出空间异质性。
The vertical spatial distribution of soil organic matter in the Aibi Lake watershed of Xinjiang was studied using the vertical lag spatial correlation coefficient along the soil depth and the empirical orthogonal decomposition method. The results show that the vertical lag spatial correlation coefficient and the empirical orthogonal function decomposition method can effectively analyze the correlation and spatial heterogeneity of the vertical distribution of soil organic matter in the spatial region. The positive or negative correlation of the vertical lag space indicates the similar or opposite The vertical distribution pattern of organic matter and the correlation of soil organic matter content decay with the increase of soil depth interval. The vertical distribution of soil organic matter along the depth of soil layer shows different characteristics in different regions of the basin. The organic matter content increases with the depth of soil layer in eastern and western regions But the content of organic matter in the central region decreased with the deepening of the soil layer. Moreover, the spatial heterogeneity of the rate of soil organic matter increasing or decreasing in the vertical direction also showed spatial heterogeneity.