基于GIS的宁夏中部干旱带土地利用生态安全动态评价
发布时间：2018-11-06 20:55
【摘要】：土地利用生态安全评价是区域可持续发展关注的重要内容之一。以宁夏中部干旱带为例,针对研究区实际生态问题,基于RS和GIS技术,构建"隐患—状态—免疫"生态安全评价指标体系,采用熵权法与综合指数模型,实现了30m×30m栅格水平可视化的土地利用生态安全综合评价。结果表明:2004—2014年,研究区土地利用变化和区域政策的实施结果一致。草地、林地面积急剧扩大,旱地和未利用地面积持续下降,建设用地和水域面积变化不大,水浇地面积呈缓慢增加趋势。结合已有研究成果与研究区实际,采用聚类法,将研究区土地利用安全分为5个等级:生态安全区(Ⅰ)、生态较安全区(Ⅱ)、生态临界安全区(Ⅲ)、生态不安全区(Ⅳ)和生态极不安全区(Ⅴ)。研究区土地利用生态安全指数从2004年的-0.12上升为2014年的0.03,整体状态呈变好趋势,但ESI指数仍小于0.1,处于临界安全状态。具体表现为:Ⅰ级乡镇从4个增加为5个、Ⅱ级区从10个增至11个、Ⅲ级乡镇从13个减少为12个、Ⅳ级乡镇从5个减少为4个、Ⅴ级乡镇从8个减少为7个,针对评价结果分析其动态演变机制。通过对宁夏中部干旱带土地利用生态安全动态评价,以期为宁夏境内生态移民区选址和生态环境保护提供数据支撑。
[Abstract]:Land use ecological security assessment is one of the important contents of regional sustainable development. Taking the arid zone of central Ningxia as an example, aiming at the actual ecological problems in the study area, based on RS and GIS technology, the ecological security evaluation index system of "hidden trouble, state immunity" was constructed, and the entropy weight method and the comprehensive index model were adopted. A 30 m 脳 30 m grid level visualization comprehensive evaluation of land use ecological security was realized. The results show that the results of land use change and regional policy in the study area are consistent from 2004 to 2014. The area of grassland and woodland expands rapidly, the area of dry land and unused land decreases continuously, the area of construction land and water area does not change much, and the area of irrigated land increases slowly. Combined with the existing research results and the actual situation of the study area, the land use security in the study area was divided into five levels by cluster method: ecological safety zone (鈪，
本文编号：2315445
[Abstract]:Land use ecological security assessment is one of the important contents of regional sustainable development. Taking the arid zone of central Ningxia as an example, aiming at the actual ecological problems in the study area, based on RS and GIS technology, the ecological security evaluation index system of "hidden trouble, state immunity" was constructed, and the entropy weight method and the comprehensive index model were adopted. A 30 m 脳 30 m grid level visualization comprehensive evaluation of land use ecological security was realized. The results show that the results of land use change and regional policy in the study area are consistent from 2004 to 2014. The area of grassland and woodland expands rapidly, the area of dry land and unused land decreases continuously, the area of construction land and water area does not change much, and the area of irrigated land increases slowly. Combined with the existing research results and the actual situation of the study area, the land use security in the study area was divided into five levels by cluster method: ecological safety zone (鈪，
本文编号：2315445
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