农牧交错带典型区土壤氮磷空间分布特征及其影响因素

土壤氮磷在土壤物理、化学和生物过程中扮演着重要角色，明确土壤氮磷含量和空间分布对土壤资源管理和利用具有重要意义.利用经典统计学和地统计学方法对准格尔旗土壤全氮和全磷空间分布特征及影响因子进行研究.结果表明，研究区土壤肥力水平较低，0~100 cm深度土壤全氮和全磷含量加权平均值分别为0.29 g·kg^-1和0.26 g·kg^-1.土壤全氮和全磷的块金效应值分别集中在0.15~0.43和0.34~0.53之间，表明土壤全氮（0~10 cm和80~100 cm除外）和全磷呈中等空间依赖性，空间变异由结构性和随机性因子共同主导.土壤全氮和全磷空间分布特征与土层和元素有关，即使在同一深度，土壤氮磷的空间分布特征亦不相吻合.土壤全氮主要受有机碳的影响，而土壤全磷主要受纬度、海拔、土地利用类型和土壤质地的影响.

Spatial Patterns of Nitrogen and Phosphorus in Soil and Their Influencing Factors in a Typical Agro-pastoral Ecotone

Soil nitrogen and phosphorus influence physical, chemical, and biological processes in soil, therefore, clarifying their contents and spatial patterns is of great significance for soil resource management and utilization. The spatial patterns of soil total nitrogen (TN) and phosphorus (TP) and the influencing factors in Jungar Banner were studied using classical statistical and geostatistical methods. The results showed that soil TN and TP contents decreased with soil depth, and the weighted mean values of TN and TP were 0.29 g·kg^-1 and 0.26 g·kg^-1, respectively. The nugget effect values of soil TN and TP were concentrated in the ranges 0.15-0.43 and 0.34-0.53, respectively, indicating that soil TN (except in the 0-10 cm and 80-100 cm zones) and TP were moderately spatially dependent, dominated by structural and random factors. The spatial distributions of soil nutrients were related to soil layers and elements, even in same layer, while the distributions of TN and TP were not consistent. Soil total nitrogen was mainly affected by soil organic carbon, while TP was mainly affected by latitude, altitude, vegetation, and soil texture.