摘要
加强流域生态核心区的景观生态脆弱性评价及驱动机制研究对于生态系统功能优化调控具有重要意义.以巢湖流域水环境保护区为主体,基于网格单元尺度,应用空间数据探索及地理加权回归(GWR)等工具,对1970-2015年间的研究区景观生态脆弱性时空演变特征及驱动机制进行分析.结果表明:1970-2015年间,巢湖流域水环境保护区内的土地景观类型表现为"两降三升"的变化趋势,其中,农地景观下降6.62%,建设用地景观增加6.26%;近45 a来,景观生态脆弱性均值从1970年的2.9347下降为2000年的2.6720,2015年又上升为2.7989,整体呈波动式下降趋势,景观生态脆弱性的空间分布具有显著的集聚特征;GWR回归系数显示各驱动因子对研究区景观生态脆弱性作用力不同,依次表现为:农地破碎度(FN)>植被指数(NDVI)>坡度(SLOP)>土地利用程度(LUI),各因子的回归系数均存在空间非平稳性.其中,FN因子回归系数呈现由西向东逐渐增强趋势;NDVI因子回归系数的空间分布表现出从中部向两侧递减趋势;SLOP因子回归系数分布则由西向东依次递减;LUI因子回归系数表现出从东、南向西北逐渐减弱趋势.回归系数的空间分布特征显示出不同因子对景观生态脆弱性的影响作用具有各向异性.研究结果可为巢湖流域水环境保护区的生态恢复与土地利用及景观格局优化实践等提供决策支持.
It is of great significance to strengthen the study on the assessment and driving mechanism of landscape ecological vulnerability in the ecological core area of the watershed for the optimization and regulation of ecosystem functions.Based on the grid unit scale,using spatial data exploration and geographical weighted regression(GWR)and other tools,the temporal and spatial evolution characteristics and driving mechanism of landscape ecological vulnerability in Chaohu Basin during 1970-2015 were analyzed.The results show that:from 1970 to 2015,the land landscape types of water environment protection zone in Chaohu Basin show a trend of“two falls and three rises”,among which,the agricultural land landscape decreased by 6.62%,and the construction land landscape increased by 6.26%.In the past 45 years,the average value of landscape ecological vulnerability decreased from 2.9347 in 1970 to 2.6720 in 2000,and increased to 2.7989 in 2015,showing a fluctuating downward trend as a whole.The spatial distribution of apparent ecological vulnerability has a significant clustering feature.GWR regression coefficient shows that the driving forces of each driving factor on the ecological vulnerability of the landscape in the study area are different,in order:agricultural land fragmentation(FN)>normalized differential vegetation index(NDVI)>slope(SLOP)>land use degree index(LUI),and the regression coefficient of each factor has spatial non-stationary.Among them,the regression coefficient of FN factor shows a trend of gradually increasing from west to east,the spatial distribution of the regression coefficient of NDVI factor shows a trend of decreasing from the middle to both sides,the regression coefficient of SLOP factor shows a trend of decreasing from west to east,the regression coefficient of LUI factor shows a trend of gradually decreasing from east,south to northwest.The spatial distribution characteristics of the regression coefficients show that the effects of different factors on the ecological vulnerability of landscape are anisotropic.The results can provide decision support for practice of ecological restoration and landscape pattern optimization of water environment protection area in Chaohu Basin.
作者
黄木易
仲勇
冯少茹
张嘉晖
HUANG Muyi;ZHONG Yong;FENG Shaoru;ZHANG Jiahui(Department of Environmenta l Engineering,Anhui Jianzhu University,Hefei 230601,P.R.China;Division of Science and Technology,Anhui Jianzhu University,Hefei 230601,P.R.China)
出处
《湖泊科学》
EI
CAS
CSCD
北大核心
2020年第4期977-988,共12页
Journal of Lake Sciences
基金
国家自然科学基金项目(41671174)
安徽高校人文社会科学研究重大项目(SK2018ZD043)
安徽省科技创新战略与软科学研究项目(201806a02020046)
安徽省高校自然科学研究重点项目(KJ2019A0763)联合资助.
