基于CRITIC-TOPSIS模型的浮梁县土地生态安全时空分异及其障碍因素分析

Spatio-temporal Differentiation and Obstacle Factors of Land Ecological Security in Fuliang County Based on CRITIC-TOPSIS Model

以江西省浮梁县为研究区域,基于土地利用数据与社会经济数据,从自然条件、人类活动、景观格局3个方面构建评价体系,采用CRITIC-TOPSIS模型研究2000~2018年浮梁县土地生态安全的时空分异状况,并通过障碍度模型,分析影响浮梁县土地生态安全的主要障碍因素。研究结果表明:(1)2000~2018年浮梁县土地生态安全水平呈现小幅度下降的态势,在具体历程上经历了从较好到恶化再到恢复向好的一个过程。(2)浮梁县各乡镇区域土地生态安全状况存在着显著的差异,形成差异的原因也各有不同。较为良好的地区主要集中在东部、中北部,较差的地区呈现围绕县城区聚集的特点,蛟潭镇、湘湖镇两地呈现出特殊性。(3)浮梁县土地生态安全状态受到多种障碍因素的共同影响,在不同时间节点,障碍因素与作用程度也不尽相同,关系较为复杂。水网密度、地形位指数、水土协调指数、人均耕地面积4项障碍因素对浮梁县土地生态安全的影响程度较为突出。

Take Fuliang County of Jiangxi Province as the research area.Based on land use data and social and economic data, the evaluation system is constructed from three aspects: natural conditions, human activities and landscape pattern.The spatial and temporal differentiation of land ecological security in Fuliang County from 2000 to 2018 is studied by using the CRITIC-TOPSIS model.The obstacle degree model is used to analyze the main obstacle factors affecting the land ecological security in Fuliang County. The research results show that:(1) From 2000 to 2018, the land ecological security level in Fuliang County showed a small decline, and experienced a process from good to worse and then to better.(2) There are significant differences in the land ecological security conditions among towns in Fuliang County, and the reasons for the differences are also different.The relatively good areas are mainly concentrated in the east and the central-northern part, while the poor towns show the characteristics of clustering around the county and urban areas. Jiaotan Town and Xianghu Town show their particularity.(3) The land ecological security state of Fuliang County is affected by various obstacles. At different time nodes, the obstacles and the degree of action are not the same, and the relationship is complex.Water network density, topographic location index, soil and water coordination index, per capita cultivated land area four obstacle factors to the land ecological security of Fuliang County is more prominent factors.