农田-草地景观镶嵌体土壤水分界面瞬时判定初探

Study of temporal boundary elements of soil moisture ecological boundary in cropland-grassland mosaic

采用地统计学方法和LatticeWombling界面判定方法对典型农牧交错带（河北沽源地区）农田-草地景观镶嵌体土壤水分界面的瞬时界面因子空间特征进行初探．结果表明：利用地统计学对不同粒度的土壤水分空间特征研究验证土壤水分界面存在，且存在不同生态梯度效应．应用LatticeWombling界面判定方法对农田-草地界面土壤水分进行界面的瞬时判定表明，农田-草地界面土壤水分界面的判定呈不规则曲线的界面变化；农田-草地界面土壤水分界面的界面因子（BE）在农田内部较为明显，在距农田草地边界农田一侧的3～7m处和草地内部3m处左右．

By the method of Geostatistics and Lattice wombling, the boundary elements （BE） of soil moisture of the cropland--grassland mosaic with sampling grain size were quantified, and further, the spatial patterns for soil moisture across the cropland--grassland boundary （CGB） were delineated. There is apparently spatial ecological gradient effects of soil moisture across the CGB from spatial pattern map. Lattice wombling method was used to detect the locations of simulated boundary of the soil moisture related to the cropland and grassland boundary. BE of soil moisture are found at 3 -- 7 meter inner of cropland from the border, and about 3 meter inner of grassland. The results reported here provide initial data of the spatial structure for soil moisture in the CGB. Improved understanding of ecological process and structure for soil attributes of cropland-grassland boundary is crucial for this fragmented area.