Landscape Heterogeneity Of Non-Cropped Habitats In Shenbei New District

Non-cropped habitats are collectively referred to as natural semi-natural habitats such as hedges,ponds and river surfaces in farmland ecosystems.Non-cropped habitats are embedded in farmland ecosystems.The research on its heterogeneity can provide some reference for the rational distribution of farmland landscape and land remediation.In this paper,the agricultural area of Shenbei New District is the research area,and the landscape of the study area is classified under the technical support of GIS,and landscape heterogeneity is established from four aspects:fragmentation,diversity,mosaic and distance index.Then,we use the landscape index granularity analysis method and the area information conservation evaluation method to study the appropriate analytical granularity,and use the semi-variogram function to obtain the best analytical range.Finally,the heterogeneity level of farmland landscape was obtained by using landscape pattern index method.The landscape heterogeneity level and spatial visualization characteristics of non-cropped habitat were obtained by using mobile window method and landscape pattern index method,and the relationship between landscape heterogeneity and landscape heterogeneity of non-cropped habitat was studied.Based on the analytical size of the size of the analysis and the size of 725m,the following conclusions are obtained:(1)At the level of landscape,the degree of fragmentation of farmland landscape is relatively large.the degree of diversity is relatively high,the degree of mosaic is slightly lower,the distance index is larger and the degree of heterogeneity is relatively high.At the type level,the cultivated land is the base of the landscape.The degree of fragmentation of the surface of the pond,the ditch and the river surface is relatively high,and the degree of fragmentation of the reservoir surface is relatively small.Shrubs and bare land mosaic degree is relatively good,and the mosaic of cultivated land is poor.The distance index between shrub land and bare land is relatively large,and the distance index of reservoir water surface is small.(2)At the level of landscape,the degree of fragmentation of non-cropped habitat is higher,the degree of diversity is higher,the degree of mosaic is relatively high,the distance index is larger,and the degree of heterogeneity is at a high level.At the level of type,the hydraulic construction land is the dominant non-cropped habitat landscape type.The degree of fragmentation of the pond water and ditch is larger,and the degree of fragmentation of shrub and bare land is smaller.Shrubs and bare land mosaic is better,and the reservoir surface of the mosaic is poor.The distance index between shrub and bare land is larger,while the distance index of inland tidal flat is smaller.In the spatial distribution,the non-cropped habitat landscape type with high heterogeneity is ditch,river surface and inland tidal flat,and the landscape heterogeneity of shrub land,bare land and reservoir surface is low.(3)The heterogeneity level of non-cropped habitat was positively correlated with the heterogeneity of farmland landscape.The degree of fragmentation and diversity of non-cropped habitats showed a significant positive correlation with the degree of fragmentation and diversity of farmland landscapes.The mosaic degree and landscape distance index of non-cropped habitats and the mosaic degree and landscape distance of farmland landscape Index is related.