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[1]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.

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Health Evaluation and Obstacle Factors Diagnosis of Land Use System Based on PSR Model—A Case Study of Yanchang County

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 26 Number of periods: 2019 02 Page number: 283-289 Column: Public date: 2019-04-28

Title:: Health Evaluation and Obstacle Factors Diagnosis of Land Use System Based on PSR Model—A Case Study of Yanchang County

Author(s):: ZHONG Shaohua¹, SHI Peng¹, YANG Wengang¹, LI Zhanbin^1,2, LI Peng¹, YANG Shutong¹; 1. State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi’an University of Technology, Xi’an 710048, China;
2. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, CAS & MWR, Yangling, Shaanxi 712100, China

Keywords:: land use; PSR model; health diagnosis; obstacle degree; Yanchang County

CLC:: F301.24

DOI:: -

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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