| 摘要: |
| 【目的】研究新疆玛纳斯河流域七大灌区内的土壤含水率及斥水性（用滴水穿透时间表示）的空间变异规律。【方法】在玛纳斯河流域七大灌区布设了400个土壤样点，分别用烘干法和滴水穿透时间法测定各土样的土壤含水率和滴水穿透时间，应用经典统计学方法和考虑高程影响的CoKriging方法分析各灌区土壤含水率及滴水穿透时间的变异规律。【结果】新疆玛纳斯河流域0～10，10～20 cm土层土壤含水率均值分别为12.00%和15.60%，平均土壤含水率以10～20 cm土层更高；滴水穿透时间均值为1.64 s，整体属于不斥水土壤。通过不同趋势效应下预测误差值及块金效应的比较，结果显示，0～10，10～20 cm土层土壤含水率空间变异的最优模型分别为0阶指数模型和0阶球状模型，土壤滴水穿透时间空间变异的最优模型为2阶指数模型。0～10 cm土层土壤含水率变化呈现出从东南和西北分别向西南和东北方向逐渐减小的趋势，10～20 cm土层土壤含水率的变化呈现出从东向西、从南向北逐渐减小的趋势；0～10 cm土层土壤含水率变异程度大于10～20 cm土层。滴水穿透时间的变化呈现出从东南和西北分别向西南和东北方向逐渐减小的趋势，与0～10 cm土层含水率的分布格局相似。【结论】灌区0～10与10～20 cm土层土壤含水率的空间分布格局类似，滴水穿透时间的空间分布属于强变异。 |
| 关键词: 玛纳斯河流域 土壤水分 斥水性 空间变异 新疆 |
| DOI： |
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| 基金项目:国家自然科学基金项目(51579213，U1203182)；西北农林科技大学基本科研业务费优秀青年基金项目(YQ2013006) |
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| Spatial variability in soil moisture and water repellency in Manasi River basin |
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SHAO Zhi-yi,LI Yi
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| Abstract: |
| 【Objective】The spatial variability in soil moisture and water repellency (represented as water droplet penetration time) were studied in 7 irrigation areas of Manasi River basin in Xinjiang.【Method】A total of 400 soil samples were collected from 7 irrigation areas and measured by oven dried method and water droplet penetration time method.Then classical statistics and CoKriging methods were used to analyze the spatial variation.【Result】Average soil moistures at the depths of 0 to 10 and 10 to 20 cm were 12.00% and 15.60%,respectively.Soil in this area was generally non water repellent with average water droplet penetration time of 1.64 s.The best models of semi variogram at two depths were zero order exponential model and zero order spherical model,respectively.The best model for water droplet penetration time was second order exponential model.Soil moisture at the depth of 0 to 10 cm decreased from southeast to southwest and from northwest to northeast,whereas soil moisture at the depth of 10 to 20 cm reduced from east to west and from south to north.Variation degree of moisture at depth of 0 to 10 cm was higher than that at 10 to 20 cm.The water droplet penetration time changed similarly with soil moisture at depth of 0 to 10 cm.【Conclusion】The spatial distributions of soil moisture contents at depths of 0 to 10 and 10 to 20 cm were similar.The spatial variability of water droplet penetration time was strong. |
| Key words: Manasi River basin soil moisture water repellency spatial variability Xinjiang |
