叶尔羌河流域棉田土壤有机碳和全氮含量调查分析

On the Distribution of Soil Organic Carbon and Total Nitrogen in the Yarkant River Basin

对叶尔羌河流域棉田土壤有机碳、全氮垂直分布状况进行了研究.结果表明：（1）剖面分布上不同地貌棉田土壤中有机碳、全氮含量随土壤深度呈下降趋势,冲积扇、扇缘、冲积平原不同土层有机碳、全氮含量变化规律为0~20 cm〉20~40 cm〉40~60 cm;（2）叶尔羌河流域棉田土壤中C/N为4.39~16.12,C/N在0~20 cm土层最高,在40~60 cm的土层最低,冲积扇、冲积平原不同土层C/N随土壤深度的增加而降低,而在扇缘不同土层C/N随土壤深度的增加而上升.

This study addresses the vertical distribution of organic carbon and total nitrogen in the cotton fields in the Yarkant River Basin. The results show that： （ 1 ） in terms of the vertical distribution, the content of organic carbon and total nitrogen decreases with the increase of soil depth. The variation ratio of organic carbon and total nitrogen content with the change of soil depth in the alluvial fan, fan, alluvial plain is 0 - 20 cm 〉 20 - 40 cm 〉 40 - 60 cm; （2） in the cotton field of the Yarkant River Basin, C/N is 4.39 -16.12, with the maximum content in the 0 -20 cm soil layer and the minimum content in the 40 -60 cm soil layer. C/N decreases with the increase of soil depth in the alluvial fan and alluvial plain while C/N decreases with the in- crease of soil depth in different soil layers.