ZHONG Shaohua,SHI Peng,YANG Wengang,et al.Health Evaluation and Obstacle Factors Diagnosis of Land Use System Based on PSR Model—A Case Study of Yanchang County[J].Research of Soil and Water Conservation,2019,26(02):283-289.
基于PSR模型的土地利用系统健康评价及障碍因子诊断——以延长县为例
- Title:
- Health Evaluation and Obstacle Factors Diagnosis of Land Use System Based on PSR Model—A Case Study of Yanchang County
- Keywords:
- land use; PSR model; health diagnosis; obstacle degree; Yanchang County
- 分类号:
- F301.24
- 摘要:
- 土地利用系统健康评价是从系统的结构、功能和效益等方面进行的评价，是评价土地资源可持续利用的重要手段。基于PSR模型理论，构建了延长县土地利用系统健康评价的指标体系，采用改进熵值法对各指标进行了权重赋值，对其土地利用系统进行了健康评价并诊断影响其系统健康的障碍因子。研究结果表明：（1）2000年以前延长县各土地利用类型面积变化较小，2000年以后草地和林地面积大幅增加，到2010年分别达到了1 165.58，431.10 km2，其林草面积占延长县总面积的一半以上。（2）延长县土地利用系统健康状态1980—2010年呈逐渐好转的趋势，其综合指数从1980年的0.268上升到2010年的0.654，土地利用健康等级从“不健康”转变为“亚健康”状态。（3）2000年以前系统健康的主要障碍因素有森林覆盖度、人均GDP、水土流失治理率、有效灌溉率，2000年以后主要障碍因素逐渐转变为土地垦殖率、水土协调度、人口自然增长率等。（4）系统评价的3个子系统，其中属系统状态的障碍度最高；系统压力的障碍度随时间变化一直呈上升趋势；系统响应障碍度随时间变化一直呈减小趋势。
- Abstract:
- The health evaluation of land use system is an evaluation from the aspects of the structure, function and efficiency of the system, is an important means to evaluate the sustainable utilization of land resources. Based on the PSR model theory, the index system of the health evaluation of the land use system in Yanchang County was constructed. The index was weighted by the improved entropy method, and the comprehensive index (CEL) and the obstacle model were used to evaluate the land use system, and to diagnose the obstacle factors affecting the health of the land use system. The results showed that: (1) the area of land use types in Yanchang County changed little before 2000, and the areas of grassland and woodland increased significantly after 2000, and the areas of grass land and woodland were 1 165.58 km2 and 431.10 km2 in 2010, respectively, and the areas of forest and grass accounted for more than half of the total area of Yanchang County; (2) the health status of the land use system in Yanchang County gradually improved from 1980 to 2010, and its comprehensive index rose from 0.268 in 1980 to 0.654 in 2010, and the health grade of land use changed from ‘unhealthy’ to ‘sub-health’; (3) the main obstacle factors of system health before 2000 were forest coverage, per capita GDP, soil erosion control rate and effective irrigation rate; after 2000, the main obstacle factors gradually changed into land reclamation rate, water and soil association scheduling, natural population growth rate and so on; (4) the three subsystems of system evaluation, among which the system state had the highest obstacle degree; the obstacle degree of system pressure had been on the rise with time, and the system response obstacle degree had been decreasing with time.
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备注/Memo
收稿日期:2018-04-28;改回日期:2018-06-19。
基金项目:国家重点研发计划（2017YFC0504704）；国家自然科学基金（41601092）
作者简介:钟少华(1995-),男,陕西商洛人,硕士研究生,研究方向为生态环境建设。E-mail:763772245@qq.com
通讯作者:时鹏(1986-),男,山东菏泽人,副教授,主要从事景观生态学研究。E-mail:shipeng015@163.com