基于PSR模型的兰州都市农业生态安全动态评价

林栋,马晖玲,柳小妮

中国农学通报. 2015, 31(20): 119-125

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中国农学通报 ›› 2015, Vol. 31 ›› Issue (20) : 119-125. DOI: 10.11924/j.issn.1000-6850.casb15020056
资源 环境 生态 土壤 气象

基于PSR模型的兰州都市农业生态安全动态评价

  • 林栋1,2,马晖玲1,2,柳小妮1,2
作者信息 +

Dynamic Assessment of Ecological Security of Urban Agriculture in Lanzhou City Based on PSR Model

  • Lin Dong1,2, Ma Huiling1,2, Liu Xiaoni1,2
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History +

摘要

为评估发展都市农业对区域生态环境的影响，调控农业生态系统结构与功能健康运转，对都市农业生态安全动态进行分析，基于PSR模型建立由4个层次24个指标构成的评价体系，分析1989—2009年兰州都市农业生态安全动态变化过程及影响因素，实现典型生态脆弱区都市农业综合生态安全的系统识别与预警。结果表明：1989年兰州都市农业生态安全为较不安全（II级）水平，1999年为临界安全（III级），2009年为较安全（IV级）。20年间综合安全指数增长46.7%，生态安全呈逐渐改善趋势。1989—2009年响应安全指数动态度最大为31.50%。对兰州都市农业综合生态安全有显著影响的指标为：第一产业产值、社会消费品零售总额、人均耕地面积、第二产业产值和农民纯收入。1989—2009年兰州都市农业生态安全格局变化，主要由耕地面积的转移引起。该实证研究为动态评价生态脆弱区都市农业生态安全等级，构建生态安全格局及预警体系提供了有效途径，生态安全动态分析可为监测和改善都市农业可持续发展提供依据。

Abstract

In order to assess the effect of urban agriculture development on ecological environment, and regulate the structure and function of agricultural ecosystem, dynamic of ecological security of urban agriculture was analyzed. Based on the Pressure-State-Response (PSR) model, 24 indexes were selected from 4 levels to build an assessment system to analyze the dynamic and influencing factors of ecological security of urban agriculture. It could serve as an early warning and system identification on ecological security of urban agriculture. Taking Lanzhou City as an example, this paper researched the ecological security trend at time scale (1989—2009) by PSR model. The results showed that ecological security of urban agriculture in Lanzhou was in level II in 1989, level III in 1999 and level IV in 2009. Index value of ecological security increased by 46.7% in the past 20 years and the status of ecological security was improved gradually. The dynamic degree of ecological response was 31.50% from 1989 to 2009. There were 5 factors which had significant effects on ecological security of urban agriculture in Lanzhou, including primary industry output value, total retail sale of consumer goods, cultivated area per capita, secondary industry output value and net income of farmers. Cultivated land transferring into construction land and unused land was the most important factor for change of ecological security pattern of urban agriculture from 1989 to 2009 in Lanzhou. This empirical study provided an effective way to assess the ecological security level of urban agriculture in ecological fragile region dynamically and construct the early-warning system and ecological security pattern. The dynamic analysis also provided the evidence for monitoring and improving agricultural sustainable development.

关键词

生态安全；PSR模型；都市农业；兰州

Key words

ecological security; PSR model; urban agriculture; Lanzhou

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林栋,马晖玲,柳小妮. 基于PSR模型的兰州都市农业生态安全动态评价. 中国农学通报. 2015, 31(20): 119-125 https://doi.org/10.11924/j.issn.1000-6850.casb15020056
Lin Dong,Ma Huiling and Liu Xiaoni. Dynamic Assessment of Ecological Security of Urban Agriculture in Lanzhou City Based on PSR Model. Chinese Agricultural Science Bulletin. 2015, 31(20): 119-125 https://doi.org/10.11924/j.issn.1000-6850.casb15020056

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