Gradient analysis on landscape heterogeneity of green space pattern in the urban fringe of Zhengzhou City

Based on principles and methods of landscape ecology,taking northwest quadrant transect of Zhengzhou for example,this paper analysized the green space landscape heterogeneity gradient,evenness index and patch density index of five different layers.The results showed that with the deciease of human intervention,green landscape diversity increased landscape fragmentation decreased,heterogeneity increased and then decreased,and ecological stability gradually enhanced.Analysis on the elements of the different layers in the regional landscape composition and heterogeneity index showed that the key to the improvement of landscape diversity of green landscape and maintenance of the ecological stability is modenate human interference,changing the existing green landscape type ratio,increasing the area of the ever-shrinking landscape types;strict control of the erosion of cultivated land during the course of peri-urban spatial expansion,and focusing on protecting the edge of green landscape.