Ecological environment in the Dongting Lake basin over the past decade:Spatio-temporal dynamic characteristics and their influencing factors from 2010 to 2019
Ecological environment in the Dongting Lake basin over the past decade:Spatio-temporal dynamic characteristics and their influencing factors from 2010 to 2019
Since the Dongting Lake basin is a significant ecological zone in the middle and lower reaches of the Yangtze River,quantitative monitoring and evaluation of its ecological environment serve as a prerequisite for regional ecological conservation,restoration,and governance.Using MODIS products involving 2010-2019 remote sensing data,this study constructed the remote sensing ecological index(RSEI)for the Dongting Lake basin based on four ecological indices:greenness,humidity,dryness,and heat.Furthermore,this study explored the spatio-temporal dynamic characteristics of the ecological environment in the basin and their influencing factors.The results show that:① From 2010 to 2019,the Dongting Lake basin exhibited an elevated greenness index,a reduced humidity index,and relatively stable dryness and heat indices;②The ecological environment of the Dongting Lake basin was generally satisfactory,with a mean annual RSEI of 0.58,indicating a fluctuating growth.In terms of spatial distribution,the ecological environment in the western and surrounding areas was superior to that in the eastern and central areas;③ There were strong correlations between RSEI and precipitation,air temperature,elevation,and land cover.The RSEI was the highest(0.65)for forest land and the lowest(0.31)for construction land.As for the two primary land conversion types(grassland → forest land,arable land → grassland)in the basin,the former type could improve the regional ecological environment(ΔRSEI=0.002 5,a contribution rate of 46.3%),whereas the latter type might lead to ecological environment deterioration(ΔRSEI =-0.000 4,contribution rate:44.44%).The results of this study,assisting in deeply understanding the spatio-temporal characteristics of the ecological environment in the basin and their internal driving mechanisms and facilitating scientific land planning and ecological environment governance,hold critical theoretical and practical significance.
关键词
遥感生态环境指数/MODIS数据/土地利用/覆盖变化/洞庭湖流域
Key words
remote sensing ecological index/MODIS data/land use/cover change/Dongting Lake basin
万方数据