基于SDR模型的抚仙湖流域生态安全空间分异特征研究
Acta Ecologica Sinica（2023）
云南师范大学能源与环境科学学院
Abstract
抚仙湖流域作为我国重要的战略水资源储备区,生态安全地位重要.本研究以该流域为研究对象,采用"状态-隐患-响应"模型,探索性空间分析法,基于格网尺度分析其 1987-2020 年生态安全空间分异特征.结果表明:(1)抚仙湖流域生态安全空间差异性明显,生态安全状况以中度安全(Ⅳ级)与高安全(Ⅴ级)状态为主,主要分布于流域四周,生态不安全(Ⅰ级)、较不安全(Ⅱ级)、临界安全(Ⅲ级)成片地集中于流域南北岸及东岸中部的人口农业密集区.(2)研究区生态安全空间集聚效应明显,全局空间自相关系数较高,且逐期上升,集聚效应增强,并以高高(HH),低低(LL)集聚为主,HH区域集中于流域西北,东南,西岸中部片区,LL区域分布于流域北岸人口密集区及南岸的农业地带.(3)研究区生态安全在不同土地利用类型、坡度、人口密度上空间分异规律明显,生态不安全(Ⅰ级)在建设用地分布居多,生态较不安全(Ⅱ级)和生态临界安全(Ⅲ级)以耕地分布为主,生态中度安全(Ⅳ)和高安全(Ⅴ级)主要分布在林地.生态安全分别与坡度、人口密度存在明显的分异特征,坡度增加,生态安全水平高,人口密度变大,生态安全质量越低.
MoreKey words
ecological security evaluation,grid scale,SDR model,Fuxian Lake Basin,spatial differentiation
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