典型岩溶坡面土壤水分的空间变异研究

选取典型岩溶区顺坡和土地整理后的坡改梯土壤水分空间分布为研究对象,应用地统计学与GIS技术,将土壤水分室内布点和实地监测相结合,对果化示范区进行两个坡面的网格布点和坡面土壤水分空间变异研究.结果表明:顺坡地和土地整理后的坡改梯两个坡地的空间分布存在一定程度的全局空间正相关;两个坡地的空间聚集区和空间孤立区呈现出类似的高-高集聚和低-低集聚明显,而孤立区零星分布的特征;两个坡地均符合球状模型,顺坡地的土壤水分受坡面情况的影响较大;土地整理后的坡改梯土壤水分主要受地形条件和人为因素共同作用的影响;顺坡和土地整理坡地的土壤水分的最小空间变程分别约为90 m和135 m,可作为不同类型坡面土壤水分样点间隔的布设依据.研究结果对于指导典型岩溶区农业生产、保障区域土壤资源可持续合理利用具有重要的理论意义和参考价值.

Spatial heterogeneity of soil water in typical terracing and sloping field in Karst

Selected terracing and sloping fields as study object in the typical karst area at Guohua demonstration area, used geostatistics and GIS technology to research the spatial distribution of soil moisture content, pre-meshed points in the laboratory, and collected soil samples in the experimental zone, then tested soil moisture content in the laboratory. The results showed that in the two experimental zones, the spatial distribution of soil moisture content was a certain degree of high degree positive correlation; space gathering area and space isolated area showed a similar high - high agglomeration and low - low agglomeration characteristics obviously, and isolated areas scattered; the spatial distribution of soil water content all accorded with the spherical model, soil moisture content was affected by the condition greatly in the sloping fields; in the terracing, the land was consolidated, soil moisture was mainly affected by the combined effects of terrain conditions and human factors; the minimum spatial Variable-range was about 90 m in the sloping fields, and 135 m in the terracing, the distance ould be emplaced as the sampling point interval basis at different types of sloping fields. The research has important theoretical significance and reference value for agricultural production and sustainable use of soil resources.