基于指示Kriging法的地下水埋深与土地利用变化关系研究

Study on the Relationship Between Groundwater Depth and Land Use Change Based on Indicator Kriging Method

研究地下水埋深的时空变化对合理开发利用地下水资源、促进作物生长以及防治土地盐渍化有着重要的意义。以河套灌区解放闸灌域为研究区域,利用指示Kriging插值分析不同灌溉时期的地下水位埋深的时空变化规律,并结合土地利用类型分类图,叠加分析不同地下水埋深变化与土地利用类型转移的关系。结果表明:①解放闸灌域地下水埋深的年内变化呈双峰型曲线,最小值出现在5、6月,最大埋深值出现于8、9月,各年灌域内地下水埋深总体呈增大趋势,地下水埋深在空间上从西南地区向东北地区逐渐增大,具有浅埋区面积增大、深埋区面积减小的特征;②地下水埋深在1.82~1.99 m变化,有利于灌域内耕地、林草地的稳定生长;从局部区域的生态环境变化来看,当地下水埋深大于2 m,各地区均存在土地退化的不良转化现象。

It is very important to study the temporal and spatial variation of groundwater depth for the rational development and utilization of groundwater resources,the promotion of crop growth and the prevention and control of land salinization.Taking Jiefangzha of Hetao Irrigation Area as the research area,this paper analyzes the spatial-temporal variation of groundwater depth in different irrigation periods by the indicator Kriging interpolation,and explores the relationship between different groundwater depth and land use type change with land use type classification map.The results show that:①The annual variation of groundwater depth in the Jiefangzha irrigation area presents a double-peak curve.The minimum value appears in May and June,while the maximum value appears in August and September.On the whole,the groundwater depth in the irrigation area shows an increasing trend in each year,and the groundwater depth gradually increases from southwest to northeast,with the characteristics of shallow buried area increasing and deep buried area decreasing;②The groundwater depth changes from 1.82 m to 1.99 m,which is conducive to the stable growth of cultivated land,forest and grassland in irrigation area.From the perspective of regional ecological environment change,when the groundwater depth is greater than 2 m,there is an adverse transformation of land degradation.