Ecological assessment and conservation measures of land for the city of Xinzheng

摘要

Survey and assessment of land ecological status is fundamental for the efficient use of land resources and effective protection of the environment.In this study,we constructed an evaluation system for land ecological status for the city of Xinzheng,using 21 indexes selected from 4 aspects related to natural fundamental factors that affect land conditions,structural factors,pollution and degradation factors,and comprehensive factors that contribute to ecological construction and conservation.The comprehensive scores were calculated using maximum difference normalization method and the entropy method to determine the weight.The city was classified into 5 levels according to the score,and maps of estimated values for land ecological status were constructed using the ArcGIS software.The results show that land ecological conditions in the city was overall good,with excellent and good areas accounting for74.62％ of the total land area.These areas were mainly located in lower elevation and fiat areas.On the other hand,areas with a poor ecological situation were mainly in the central and northern areas,where there is greater human activity,resulting in a great impact on land ecology.