河北省近20年耕地生态安全动态变化及阻力分析

发布时间：2018-03-05 14:51

本文选题：耕地　切入点：生态安全　出处：《水土保持研究》2017年01期 　论文类型：期刊论文

【摘要】：耕地的生态安全关系到粮食安全及区域可持续发展。运用PSR模型,选取耕地生态系统压力、耕地生态系统状态和耕地生态系统响应3个准则层,人口自然增长率、土地垦殖率和农民人均纯收入等17个指标层,构建河北省耕地生态安全指标体系,并采用熵值法和阻力诊断模型,对1991—2010年河北省耕地生态安全状况进行了评价分析。结果表明:(1)1991—2010年河北省耕地生态安全状态经历了"不安全—较不安全—临界安全"的变化阶段。(2)从单项指标变化趋势上看,1991—2010年河北省单位耕地化肥负荷、单位耕地农膜负荷、单位耕地农药负荷等指标阻力度上升幅度较大。系统压力和系统状态的阻力度呈上升趋势,而系统响应的阻力度呈下降态势。因此,在耕地利用过程中应注重对农药和化肥使用的管理,防止耕地生态环境的持续恶化,以保护耕地生态安全。
[Abstract]:The ecological security of cultivated land is related to food security and regional sustainable development. By using PSR model, three criteria layers, namely, cultivated land ecosystem pressure, cultivated land ecosystem state and cultivated land ecosystem response, are selected, and the natural population growth rate is obtained. The ecological security index system of cultivated land in Hebei Province was constructed by using entropy method and resistance diagnosis model, and 17 index layers, such as land reclamation rate and per capita net income of farmers, were constructed. The ecological security status of cultivated land in Hebei Province from 1991 to 2010 was evaluated and analyzed. The results show that the ecological security status of cultivated land in Hebei Province from 1991 to 2010 has gone through the changing stage of "unsafe-less unsafe-critical safety". On the trend, the fertilizer load per unit cultivated land in Hebei Province from 1991 to 2010, The resistance degree of agricultural film load per unit cultivated land and pesticide load per unit cultivated land is larger. The resistance degree of system pressure and system state is rising, while the resistance degree of system response is decreasing. In order to protect the ecological security of cultivated land, we should pay attention to the management of pesticide and fertilizer use in the process of cultivated land utilization, prevent the continuous deterioration of cultivated land ecological environment.
【作者单位】：河北农业大学资源与环境科学学院;河北农业大学国土资源学院;
【基金】：国土资源部公益性行业项目“环渤海盐碱土地景观整治与植物修复技术集成”(201311060)
【分类号】：F323.211

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