汉中市生态脆弱性评价及空间分布规律研究

THE ECOLOGICAL VULNERABILITY ASSESSMENT AND SPATIAL DISTRIBUTION OF HANZHONG CITY

关键词:  生态脆弱性 评价 空间分布 汉中市

Key words:  ecological vulnerability  assessment  spatial distribution  Hanzhong city

摘要:

［目的］ 通过评价汉中市生态系统的脆弱性，掌控其空间分布差异，以促进其资源的合理利用、实现其可持续发展。［方法］ 确定30m×30m的栅格为基本评价单元，建立汉中市各数据资料的栅格数据库，以此作为生态脆弱性评价的基础数据资料，构建生态脆弱性评价指标体系，并通过计算评价值来最终反映生态脆弱性的高低，以及区域脆弱性的空间分布状况。［结果］ 将汉中市生态脆弱性评价结果结果划分为潜在脆弱、轻度脆弱、中度脆弱、重度脆弱等4个级别，其中轻度脆弱所占比例最大，为38.46%，轻度脆弱区主要集中分布在汉中市东部，涉及县域主要包括略阳县东部地区，宁强县、勉县及南郑县大部分地区，留坝县北部地区；占比最小的为重度脆弱，仅为11.28%，重度脆弱区集中在镇巴县。［结论］ 汉中市生态脆弱性以轻度脆弱为主，其生态脆弱性呈现出由西北部地区向东南部地区逐渐增强的趋势。

Abstract:

The objective of this paper is to evaluate the fragility of ecological system and reveal the spatial distribution difference in order to promote the rational use of its resources and realize its sustainable development. Taking 30 m by 30 m grid as the basic evaluation unit, it built the data of grid database as the ecological vulnerability evaluation data, and constructed an evaluation index system of ecological vulnerability, and ultimately calculated the value reflecting the high and low ecological fragility and the spatial distribution of regional vulnerability. The results showed that: the ecological vulnerability in Hanzhong could be divided to 4 classes, i.e., vulnerable, mildly vulnerable, moderately vulnerable, and seriously vulnerable. The mildly vulnerable area occupied the most proportion with 38.46%, where mainly distributed in east Hanzhong city, such as Ningqiang, Mianxian, Nanzheng, and Liuba county. The seriously vulnerable area occupied the least proportion with 11.28%, where mainly distributed in Zhenba county. It concluded that the ecological system in Hanzhong city was mild fragile, which presented an increased trend from the northwest to the southeast region.