Evaluation of eco-security of cultivated land requisition-compensation balance based on entropy weight and matter element model

This paper used Yongchuan District in Chongqing City as a case study to address the issues of method disunity, information shield and subjectivity of evaluation processes of eco-security of cultivated land requisition-compensation balance in China with the context and theory of entropy weight and matter element model. The entropy weight method included building systems of assessment factors; setting up factor fields for classifications of eco-security, entropy construction model and matter element analysis; relevancy calculations of factors and eco-securities of cultivated land requisition-compensation balance; and mapping out factor weights. The results showed that eco-security grade of cultivated land requisition-compensation balance for 2005 and 2009 was generally safe and for 2015 and 2020 was safe. The overall trend in eco-security of cultivated land requisition-compensation balance in Yongchuan District improved from general security to high security over the period from 2005, 2009, 2015 onto 2020. The key driving factors of eco-security of cultivated land requisition-compensation balance in the study area included population density, forest cover ratio, pesticide load per unit-area of cultivated land, chemical fertilizer load per unit-area cultivated land, etc. Also the key driving factors of eco-security of cultivated land requisition-compensation balance in Yongchuan District included per-capita cultivated land, cultivated/uncultivated land ratio, annual farmers' per-capital net income growth rate, annual GDP growth rate, primary industry annual growth rate, population natural growth rate, etc. Compared with fuzzy comprehensive evaluation, entropy weight and matter element analysis results were largely consistent. Although differences existed in individual years, leapfrog phenomenon was not apparent. This showed that the evaluation results of matter element analysis were visualized, reasonable and reliable. Also the matter element analysis was practical and the scientific evaluation method more meticulously described the evaluation process of eco-security of cultivated land requisition-compensation balance.