东北农牧交错带土地生态环境安全指标体系的建立与综合评价——以镇赉县为例

本文以吉林省镇赉县为例,探讨了土地生态环境安全评价的方法。依据区域生态安全评价一般性指标体系,结合镇赉县土地利用结构及特点,从土地资源生态压力、生态环境状态和生态环境响应三方面入手,建立了由19项指标组成的土地生态环境安全评价指标体系。运用层次分析原理和综合评分法,计算该地区土地生态环境安全综合指数。研究表明,该地区在1985年和2001年土地生态环境安全状况均处于“很不安全”状态,且有不断恶化的趋势。滥垦、滥伐、过度放牧以及粗放经营的生产方式是导致该地区土地生态环境安全状况不断下降的主要原因。

Evaluation on Ecological Security of Land Resources in Ecotone Between Farming and Animal Raising in Northeastern China: A Case Study of Zhenlai County

In this paper the evaluation methods of land ecological security of Zhenlai County are discussed.Based on ordinary index system of regional ecological security,taking the characteristic of regional land use into account,we compose and construct the index system of land ecological security,from three aspects as ecological pressure,ecological status and ecological response of land resources.Then a comprehensive evaluation on the ecological security of land resources in the county is taken.The resuts indicate that the security status of the county is being deteriorated.The main causes for the deterioration of land ecological security are unreasonable reclaimation\,denudation,overgrazing and the extensive farming.