科研之友
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摘要
The analysis on the regional ecological security is an intricate, challenging task. Based on the existing evaluation methods of the ecological environment and ecological security, a system for assessing the ecological security of freeze-thaw agricultural area was developed using a pressure-state-response (PSR) model and the geographic information system (GIS) software. A case study is presented for the Sanjiang Plain located in the in the middle and high latitude temperate regions. Due to the agricultural reclamation and the rapid increase of population, the ecological environment had been destroyed since 1950s. Response to the deteriorating ecological environment of Sanjiang Plain, an evaluation index system for ecological security was constructed, and the weight of each index was determined by the method of Analytic Hierarchy Process (AHP). We then used the model of ecological security assessment for freeze-thaw agricultural area to comprehensively evaluate the status of ecological security in Sanjiang Plain. Our results showed that the ecological security in Sanjiang Plain had deteriorated from an 'early stages of damage status' in the 1950s to 'moderately damaged status' in 1986. Furthermore, it had again returned to the status of 'early stage of damage' in 2005 and almost to the "relative safety status" in 2010. The ecological security research can provide a scientific and effective basis for making decisions about ecological environmental protection and land use in Sanjiang Plain. However, with respect to the index representing the freeze-thaw characteristic, it needs to be further studied in future research.
- 出版日期2013
- 单位北京师范大学
