Optimizing theory and case studies of cultivated slope land in the center of three gorges reservoir area based on patch-scale land evaluation

Heterogeneity and stability of the agricultural landscape is the premise to maintain the stable and high efficient agricultural ecosystem. Currently, habitat loss and the changes of landscape structure caused by human activities have become the important reason for the loss of biodiversity of the agricultural landscape. This study implies that some landscape metrics can be good indicators for revealing diversity characteristics of different habitats. To get a better relationship of the landscape heterogeneity and species diversity, we recommend further research about scale effects of the landscape metrics and much more application studies of these metrics in Landscape Ecology. This paper suggested that the control and optimization scheme should not only combine the spatial distribution pattern and the ecological functions of cultivated slope land, hut also consider the current distribution and future trends of sloping farmland. The result of this study provides a theoretical basis for the current cultivated slope land optimization as well as a certain guidance to the cultivated slope land regulation in the Three Gorges Reservoir area.