基于变异函数的耕地质量等别监测点布设分析——以四川省中江县和北京市大兴区为例

摘要

The purpose of this study is to explore a method of location sampling for monitoring the quality of cultivated land on flat area and hilly ground through studying the variation of the land types in different areas.Method of semi-variable function is employed.The results indicate that optimal semi-variable theoretical models of cultivated land quality of ZhongJiang County and DaXing District fitted well with the spherical model.The spatial variability of cultivated land quality is affected by structural factors in plain region,and it is affected by random factors in hilly area.%研究目的：研究丘陵与平原区耕地质量变异情况的差异,总结不同地貌类型监测点布设原则,为合理布设耕地质量监测点提供依据。研究方法：采用地统计学的变异函数分析耕地质量变异情况,分析对比平原区与丘陵区耕地质量变异影响因素,依据变异分析结果布设监测点。研究结果：中江县和大兴区耕地质量的变异模型均符合球状模型,依据各自变异特征,在区域内品字状布设监测点,并应用克里格插值分析验证,结果表明所布设监测点满足耕地质量等级监测要求。研究结论：平原地区的耕地质量在空间上的变异受结构性因素影响较大,空间变异特征更有规律,品字形布设能够满足监测精度要求;丘陵地区受随机性因素影响较大,需根据实际情况加密监测点。