紫色丘陵区土壤养分空间变异特征研究——以重庆市铜梁县为例

为了解紫色丘陵区土壤养分含量分布及空间变异特征，对因地制宜施肥给予科学指导，笔者利用地统计学方法，以重庆市铜梁县为例，对紫色丘陵区土壤中速效氮、磷、钾、有机质及土壤pH进行空间分布变异特征研究。结果表明：速效氮、磷、钾及有机质的均值分别为105.86 mg/kg、7.19 mg/kg、81.31 mg/kg、22.89 g/kg，均属于中低等水平；土壤pH主要集中在6.5附近，土壤偏酸性。土壤有效磷变异系数最大，为77.61%；其次是速效钾、有机质和碱解氮，均属于中等变异性强度；相对而言，pH分布最为稳定，变异系数为17.78%。从空间插值图可知，碱解氮含量大都在114.42~148.39 mg/kg之间变化；有效磷含量基本都小于14.35 mg/kg；速效钾分布最不规律，约1/2区域的速效钾含量在60.56~74.82 mg/kg之间；有机质含量则主要集中分布在15.27~33.77 g/kg；大部分地区土壤pH在5.2~6.5之间，进一步说明该区域土壤偏酸性。

Study on Spatial Variability of Soil Nutrients in Purple Soil Hilly Region -Take Tongliang in Chongqing as an Example

In order to discover the content and spatial variability of purple soil nutrients in southwest China and to make proper fertilization recommendations adapted to the local conditions, the author combined geostatistics with GIS to analyze the spatial variability of soil nutrients in topsoil (0-20 cm) in Tongliang, Chongqing. The results showed that the mean of available N, available P, available K and Organic matter were 105.86 mg/kg, 7.19 mg/kg, 81.31 mg/kgand 22.89 g/kg, respectively, and they were all in m...