新疆若羌县土壤微量营养元素的空间分布特征及影响因素

基于若羌县2015年143组0~20 cm土层土壤6种微量营养元素(Fe、Mn、Zn、Cu、Mo和B)的实测含量,运用多元统计分析、地统计学和Arc GIS技术相结合的方法,对研究区土壤微量营养元素的含量和空间分布特征进行分析。结果表明:Fe、Mn、Zn、Cu、Mo和B变异系数介于18.2%~47.4%,均属于中等变异。Fe、Mn、Zn、Mo和B的块金效应均小于25%,空间相关性较强,空间变异主要受到土壤母质等结构性变异主导;Cu的块金效应介于25%~75%之间,属于中等空间相关,空间变异受到人为活动等随机因素和结构性因素的共同影响。Fe、Mn、Zn和Cu的空间分布格局相似,总体呈现出从研究区四周向中心含量逐渐增大的趋势;Mo和B的空间分布格局相似,总体呈现出从南向北含量逐渐增大的趋势。土壤有机质、pH值和不同的成土母质、土壤类型、土地利用类型对土壤微量营养元素均有不同程度的影响。

Spatial distribution and its influencing factors of micronutrients in soils of Ruoqiang County, Xinjiang

Based on the analysis of seven micronutrients (Fe, Mn, Zn, Cu, Mo and B) of 143 surface soil samples in Ruoqiang County of Xinjiang, this study used multivariate statistical analysis, geostatistics and ArcGIS to explore the and spatial distribution of these micronutrients. The results showed that: (1) the variation coefficient of Fe, Mn, Zn, Cu, Mo and B varied from 18.2% to 47.4%. (2) The nugget-to-sill ratio of Fe, Mn, Zn, Mo and B were less than 25% with high spatial correlation, indicating Fe, Mn, Zn, Mo and B were influenced by structural factors such as the parent materials. The nugget-to-sill ratio of Cu ranged from 25% to 75% with medium spatial correlation, indicating the influence by the combined effects of artificial random and structural factors. (3) Spatial distribution maps showed the similar spatial distribution characteristics for Fe, Mn, Zn and Cu, with an increasing trend from the surrounding to the center. The spatial distribution pattern of Mo and B was similar, showing an ascending trend from the south to the north. (4) Soil organic matter, pH and parent materials, soil types, land use types also influenced soil micronutrients.