钟祥市平原、丘陵土壤养分空间变异性研究

摘要

[目的]本文研究了不同地形和地貌条件下土壤养分空间变异性差异规律.[方法]使用经典统计学和地统计学相结合的方法,研究了钟祥市土壤养分在不同地形和方向上的空间变异性特征.[结果]在不同地形中,土壤有机质、有效磷和速效钾的变异系数在23.79％～69.78％,属于中等变异;数据经过Box-Cox转换后,均为正态分布.丘陵地区的土壤养分均大于平原,平原地区的有机质空间相关性大于丘陵,有效磷东部的空间相关性大于西部,速效钾西部的空间相关性大于东部,说明在同一流域相同地形条件下的土壤养分在水平和垂直方向上的变异规律并不统一,这是自然环境与人为因素共同作用下产生的结果.[结论]研究区土壤养分在水平和垂直方向上的变异规律并不统一,尤其是在地理条件多变的丘陵流域范围内,养分的空间变异性受自然因素的影响较大.%[Objective]The present paper aimed to study the spatial variability of soil nutrients under different terrain and topography conditions.[Method] Classical statistics combined with Geostatistics were applied to analyze the spatial variability of soil nutrients in different terrain and direction of Zhongxiang city.[Result] The coefficient of variation of soil organic matter,available P and available K in different terrain were between 23.79 ％ and 69.78 ％ and belonged to moderate variation;All data were normally distributed after Box-Cox transformation.Soil nutrient content in the hills was higher than that in the plain.The spatial correlation of soil organic matter in plains was greater than that in hills.The spatial correlation of available P in eastern part was greater than that in the western part,but the available K was opposite.The results indicated that the spatial variability of soil nutrients in horizontal and vertical direction variation patterns were not uniform even in the same terrain and river basin,which was caused by both natural environment and human factors.[Conclusion] The spatial variation of soil nutrient in the horizontal and vertical directions was not uniform,especially in the hilly watershed with variable geographical conditions.The spatial variability of nutrients was influenced by natural factors