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基于PSR模型的广西石漠化地区土地生态安全动态评价
谢玲1,2,3, 严土强1, 高一薄3
1.广西师范大学 环境与资环学院, 广西 桂林 541004;2.岩溶生态与环境变化研究广西高校重点实验室(广西师范大学), 广西 桂林 541004;3.新疆大学 资源与环境科学学院, 新疆 乌鲁木齐 830046
摘要:
[目的] 对广西壮族自治区轻度及以上石漠化地区进行土地生态安全评价,为该区土地生态安全及其可持续发展提供科学参考。[方法] 基于PSR模型构建了广西石漠化地区土地生态安全评价指标体系,采用熵权赋权法确定权重,运用生态安全综合模型,对研究区2005,2015年的土地生态安全综合指数进行计算。[结果] 广西石漠化地区土地生态安全主导因素为人口密度、单位GDP综合耗能、土地垦殖率、耕地粮食单产、城市化水平、人口自然增长率等因素;压力指数、状态指数和响应指数共同决定广西石漠化地区土地生态安全评价的综合指数;从时间上看,2005—2015年广西石漠化地区土地生态安全经历了从临界安全等级向较安全等级的变化趋势,土地生态安全的状况主要因响应状态系统的提升,而使得综合土地生态安全指数有所上升。从空间上看,2005年贵港地区的土地生态安全等级处于不安全级,2015年南宁、贵港、来宾等地区的土地生态安全等级处于较不安全级。[结论] 广西石漠化地区的土地生态安全略有上升,但受压力和状态子系统承载力水平的限制,研究区的土地生态安全仍处于中等水平,需要进一步加强土地生态安全建设。
关键词:  PSR模型  土地生态安全  石漠化地区  广西壮族自治区
DOI:10.13961/j.cnki.stbctb.2018.06.048
分类号:
基金项目:广西师范大学青年基金项目“广西部分贫困地区乡村聚落的演变和空间优化问题研究”(201517A4);广西高校重点实验室基金项目“广西石漠化地区土地利用/覆被变化与生态优化调控研究”(YRHJ16Z016);广西高校中青年教师基础能力提升项目(2018KY0059)
Dynamic Evaluation of Land Ecological Security in Rocky Desertification Mountainous Area of Guangxi Zhuang Autonomous Region
XIE Ling1,2,3, YAN Tuqiang1, GAO Yibo3
1.School of Environment and Resources, Guangxi Normal University, Guilin, Guangxi 541004, China;2.University Key Laboratory of Karst Ecology and Environmental Change of Guangxi Province(Guangxi Normal University), Guilin, Guangxi 541004, China;3.College of Resources and Environmental Sciences, Xinjiang University, Uramqi, Xinjiang 830046, China
Abstract:
[Objective] The status of land ecological security development in the light-to-severe rocky desertification mountainous area of Guangxi Zhuang Autonomous Region was studied in order to provide scientific reference for land ecological security and its sustainable development in study area.[Methods] Based on PSR model, and from three aspects including pressure, state and response, this paper constructed a land ecological security early-warning index system for the light-to-severe rocky desertification mountainous area of Guangxi Zhuang Autonomous Region. The entropy weight method and the integrated model of ecological security were used to calculat the comprehensive index of land ecological in 2005 and 2015 in study area.[Results] The main affecting factors of land ecological security in the rocky desertification mountainous area of Guangxi Zhuang Autonomous Region were the population density, the integrated energy consumption per unit of GDP, the land cultivation rate, the per unit area yied of grain, the urbanization level, the natural population growth rate. Pressure index, state index and response index jointly determined the comprehensive index of land ecological security evaluation in the rocky desertification mountainous area. With respect to time differentiation, from 2005 to 2015, the land ecological security in the rocky desertification mountainous area had changed from critical level to mainly relatively safe level over the past 10 years, the situation of land ecological security was mainly due to the improvement of the response state system, which made the comprehensive land ecological security index increased. With respect to spatial differentiation, the land ecological security was the lowest in 2005, and the level of land ecological security was at a relatively unsafe level in Nanning, Guigang, Laibin areas in 2015.[Conclusions] Although the land ecological security in the rocky desertification mountainous area of Guangxi Zhuang Autonomous Region raised slightly, limited by the level of carrying capacity of pressure and state subsystem, the land ecological security of the study area is still at an intermediate level, the construction of land ecological security needs to be further strengthened.
Key words:  PSR model  land ecological security  the rocky desertification mountainous area  Guangxi Zhuang Autonomous Region