中大尺度下橡胶园土壤全氮和有机质含量的空间分布特征

Spatial Variability and Distribution of Soil Total Nitrogen and Organic Matter in Medium and Large Scales in Rubber Plantations

应用传统统计学和地统计学方法,对海南省国营阳江农场的农场尺度和队尺度数据进行分析。结果表明,全氮和有机质的变异系数范围为13.79%～28.24%,均属中等变异强度,且随着研究尺度的缩小,变异系数随之减少。半方差分析结果表明:2个研究尺度下,全氮和有机质均在一定范围内存在空间相关性,尺度越大,变程越大;全氮和有机质变异主要受地形、土壤类型、施肥等因素的影响,Kriging插值图均表现出明显不同的分布规律。

Descriptive statistics and geostatistics were used to analyze data at both farm and team scales. The results showed that the coefficients of variation （CV） for both soil total nitrogen （STN） and soil organic matter （SOM） variables ranged from 13.79% to 28.24%, which demonstrated a moderate variation. With the decrease in the scale, the CV for the STN and SOM were reduced slightly. Semi-variance analysis showed that both the STN and SOM variables at the two different scales were spatially correlated at different lag distances, the larger in scale, the longer in variation range. The variation of the STN and SOM was mainly due to the impact of landforms, soil types and farming practices, and the spatial distribution of the STN and SOM was obviously different when interpolated by using the Kriging method.