Land ecological evaluation based on niche fitness model 要A case study of Shangqiu city袁Henan province

Taking administrative villages as evaluation unit, the land ecological survey and assessment system was established including natural niche -fitness, structural niche fitness, stress niche -fitness and ecological construction niche-fitness. Based on ARCGIS software and niche theory, the quality of land ecological was evaluated. The results showed that land ecological conditions in different areas were different. In Yucheng country except the central region, Sui country except the central region, Ningling country except the central region, the southern of Xiayi country and the northwest of Yongcheng, the conditions of land ecology were excellent. The land ecology in the southeast of Xiayi country, the northeast of Yongcheng and the most parts of Minquan country and Zhecheng country was good. The condition was fair in Liangyuan district and Suiyang district. The land ecology of central region in every counties was poor. Soil pollution and population density were the main factors influencing the land ecological condition