基于PSR模型的河西制种基地耕地生态安全物元分析评价

Analysis and Evaluation of Hexi Seed Production Base of Cultivated Land Ecological Security Element Based on PSR Model

【目的】河西制种基地作为良种供应的中心,常年连作制种给当地带来了可观的经济增长,同时对制种基地耕地的生态安全造成威胁。【方法】本文以PSR模型为基础构建河西制种基地耕地生态安全评价指标,先后运用物元分析法与改进的熵值法,对指标量化求证。【结果】(1)2002-2016年河西制种基地耕地生态安全水平逐年提高,实现了从"临界安全"到"较安全"状态的积极转变。(2)单位化肥负荷、农药负荷、地膜负荷、制种地复种指数、单位耕地制种废弃物承载力依旧是生态安全的主要阻碍因素。(3)河西制种基地耕地生态安全面临的压力逐渐降低,生态安全状态以及采取的响应措施逐年提高。【结论】挖掘影响制种基地耕地生态安全的因素,针对阻碍因素提出相应的对策建议,以提高河西制种基地耕地的生态安全水平。

[ Objective] As a center of good seed supply, Hexi seed base brought considerable economic growth and threatened the ecological security of cultivated land. [ Method] In this paper, based on PSR model to construct Hexi seed production base of cultivated land ecological security evaluation index, successively by using matter element analysis method and the improved entropy method, the index quantification was verified. [ Result] （i） The cultivated land ecological security level of Hexi in 2002-2016 was increased year by year, and the positive change from ＇ critical safety＇ to ＇ safer＇ state was achieved. （ii） Unit fert1izer load, pesticide load, surface film load, subspecies index and unit arable land were still the main obstacles to ecological security. （iii） The pressure on the ecological safety of the cultivated area of Hexi was gradually decreasing, and the state of ecological security and the response measures taken were improved year by year. [ Conclusion ] The factors affecting the ecological security of cultivated land in the seed production base was explored, and the con＇esponding countermeasures for the obstacle was put forward to improve the ecological security level of cultivated land in Hexi.