摘要
基于生态敏感性-生态恢复力-生态压力度(SRP)概念模型,从地形、气候、植被和社会经济因子选取8个评价指标,利用遥感和GIS技术,采用主成分分析方法求取权重,对祁连山地区启动水源涵养区生态环境保护和综合治理规划研究前后近10 a的生态脆弱性程度进行系统、定量地评估,旨在揭示生态脆弱性的分布特征、时空演变及动因,为区域生态保护、资源利用和可持续发展提供参考。结果表明:(1)从研究区生态脆弱性分布来看,祁连山地区主要以轻度和重度脆弱为主,脆弱性程度从西北向东南地区逐渐减弱,西北地区植被覆盖度小,海拔高,生态环境较为恶劣是导致脆弱性程度较高的原因;(2)祁连山地区3期生态脆弱程度呈逐渐下降趋势,综合指数分别为3.307、3.118和3.103;2005年生态脆弱性较高,极度脆弱面积为28610 km^2,2010年下降为11723 km^2,2015年降低为6174 km^2,极度脆弱面积逐渐减少;(3)从祁连山地区生态脆弱性演变动因来看,8个指标对生态脆弱性影响均较为显著,但在不同的时间影响程度各不相同,2005—2015年3期数据中对生态脆弱性影响最大的均为植被指数,降水次之,地形因子影响最小。总体来看,近年来祁连山地区生态脆弱性程度有所降低,但仍然需要加强保护力度,促进生态环境可持续发展。
Global natural environment changes and increasing human activities have greatly affected the ecological environment,leading to the emergence of many ecological problems and the high attention of the ecological vulnerability.The Qilian Mountains region is an important part of the plateau ecological security barrier in China,which guarantees the ecological security in the northwestern region of China.This region is characterized by the typical continental climate with low rainfall and dry climate,where the ecological environment has been seriously influenced with social and economic development and frequent human activities.In 2008,the government issued relevant plans for the ecological management and restoration of the Qilian Mountains region.Therefore,it is of great significance to evaluate and analyze the ecological vulnerability of the Qilian Mountains region in the three phases of 2005,2010,and 2015.In this paper,according to the ecological environment characteristics of the Qilian Mountains,the operability and relevance of the evaluation indexes and the“sensitivity-resilience-stress”conceptual model of eight indicators of NDVI,topographic fluctuations,ground fragmentation,surface roughness,and topographic factors,as well as precipitation,temperature,meteorological factors,population density,and per capita GDP selected from natural and human aspects,using remote sensing and GIS technology,the principal component analysis method is used to obtain weights and ecological vulnerability Based on the ecological index and the ecological characteristics of the study area,and based on the existing ecological vulnerability assessment standards at home and abroad,the degree of ecological fragility in the Qilian Mountains during the past 10 a is systematically and quantitatively analyzed.The study's aim is to provide references for regional ecological protection,resource utilization,and sustainable development.Results showed that:(1)From the perspective of ecological vulnerability distribution in the study area,the de
作者
刘佳茹
赵军
沈思民
赵彦军
LIU Jia-ru;ZHAO Jun;SHEN Si-min;ZHAO Yan-jun(College of Geographical and Environment Science,Northwest Normal University,Lanzhou 730070,Gansu,China)
出处
《干旱区地理》
CSCD
北大核心
2020年第6期1573-1582,共10页
Arid Land Geography
基金
国家自然科学基金项目(41661084,41661005)。
关键词
生态脆弱性
SRP概念模型
生态遥感
主成分分析
祁连山地区
ecological vulnerability
SRP conceptual model
ecological remote sensing
principal component analysis
Qilian Mountains
