南疆果园滴灌条件下土壤盐分离子的空间变异性分析──以农十四师224团典型地块为例

【目的】土壤盐渍化是制约干旱半干旱地区农业生产的主要障碍因子之一,在新疆,尤其是南疆,土壤盐渍化十分严重,系统认识和掌握盐分及其离子组成的空间变异特征对于治理改良盐渍土具有重要意义。【方法】基于区域变量理论,在GIS和地统计学技术支持下,通过地统计学的半变异函数和Kriging空间插值,以南疆和田地区农十四师224团典型地块为研究区,定量分析了试验区内不同层次土壤盐分的空间变异特征。【结果】各层总盐都表现出强变异性;K+各层表现出中等变异性。0~10 cm土层,土壤中盐类主要为氯化物型;10~30 cm土层为硫酸盐—氯化物型;其它各层为氯化物—硫酸盐型。总盐及各离子理论模型主要为球状。各土层盐分及其组成的离子空间分布主要表现为条带状伴有斑块状分布。【结论】试验区土壤盐渍化与次生盐渍化的防治是近期农业管理中所必须考虑的重要因素。

Analysis of Spatial Variability of Soil Salt Ions under Drip Irrigation Conditions in Orchard of Southern Xinjiang——A Case Study of 224 Regiment of No.14 Agricultural Division

【Objective】Soil salinization is one of the main barriers in agricultural production in arid and semi arid areas,especially in southern Xinjiang.Understanding the characteristics of spatial distribution of saline soil is important in establishing strategies for soil salinity management.【Method】 In the present study,based on the regional variable theory the spatial variability of soil salinity in different soil layers were studied by means of GIS,semi-variation function of geo-statistics and Kriging method in 224 Regiment of No.14 Agricultural Division to quantificationally analyze the spatial variation of soil salinity in experimental area.【Result】 The results indicated that tota1 salts showed strong variability and K+ showed medium variability.The spatial distribution maps of tota1 salts and salt ions interpolated by Kriging interpolation all show apparently strip and block.【Conclusion】The soil salinization and secondary salinization control is an important factor that must be considered in recent agricultural management.