南疆棉田表层土壤盐分的空间变异特征分析与应用Spatial Variability of Soil Salt on the Surface of Cotton Fields in the South of Xinjiang
何雨江;靳孟贵;刘延锋;汪丙国;
摘要(Abstract):
通过研究土壤盐分的空间变异,快速准确获取土壤盐分的空间分布是精准农业和环境保护的基础。使用土壤电导率仪(PET2000)网格法在50 m×70 m面积的田块内布点(网格边长5 m),测量棉田表层土壤(0~25 cm深度,每5 cm为一层)电导率;应用ArcGIS9.2中地统计学模块构建、筛选和验证模型;利用地统计学方法研究表层土壤盐分的空间变异规律,进行空间分布预测,并针对棉田表层积盐问题提出了相应的解决措施。结果表明:克里格(Kriging)插值方法中的Rational Quadratic模型适宜预测表层土壤电导率,区内棉田表层盐分的空间变异特征明显,变异系数达到0.578,土壤盐分的空间变异性随深度增大逐渐降低;产生空间变异的主要原因是土壤岩性的空间差异和微咸水灌溉;解决棉田局部积盐的措施是根据土壤盐分空间差异特征的分析与预测进行适时定位灌溉,从而合理利用水资源并改善作物生长环境。
关键词(KeyWords): 土壤盐分;空间变异;棉田;克里格插值方法;土壤电导率仪
基金项目(Foundation): 国家科技支撑计划项目(2007BAD38B01);; 国家自然科学基金项目(40802056)
作者(Author): 何雨江;靳孟贵;刘延锋;汪丙国;
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DOI:
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