Research and Analysis of Ecological Environment Quality in the Middle Reaches of the Yangtze River Basin between 2000 and 2019

Abstract

Ecological environment quality is a long-term continuous concept that is affected by various environmental factors. Its assessment has important implications for implementing the planning and protection of dynamic regional ecosystems. Therefore, this study attempted to obtain these indicators (green, dry, wet, heat) through the Google Earth Engine (GEE) platform, and then coupled the ecological environment quality index in the middle reaches of the Yangtze River Basin (MYRB) between 2000 and 2019, based on the remote sensing ecological index (RSEI). The major results show that: (1) changes in the four indicators in summer were more obvious than those in winter, and the changes were concentrated in the central and northern regions of the MYRB; (2) both the modified normalized difference water index (MNDWI) and normalized differential build-up and bare soil index (NDBI) in summer and winter have higher weighting ratios, implying that water body changes and human activities had a greater impact on the ecological environment; and (3) ecological environment quality in the MYRB between 2000 and 2019 was relatively flat. The ecological conditions began to deteriorate in 2008, and substantial ecological degradation was noted in some areas between 2008 and 2019 (18.7% in the central region, 16.0% in the eastern region). The MYRB has an important position in the Yangtze River economic belt and is an important part of the Yangtze River protection. This research could provide a theoretical basis and decision support for the development and protection of the Yangtze River Basin (YRB) green economy.

Analysis of the Eco-environmental Quality Index in the Tropical Rainforest National Park in China during 1990-2020

“…The slope of change and z-value significance level of the time series EQI can be visualized using Sen's slope and the Mann-Kendall test (Eq.-9), which can then be used to pinpoint the study area's significant EQI change areas (Table 3) (Tong et al, 2018;Jia et al, 2021;Zhang et al, 2021).…”

“…As an ecological parameter with continuous long-term characteristics, ecological quality is strongly influenced by various environmental factors (Zhang et al, 2021), and geospatial techniques can rapidly, accurately, and quantitatively assess the spatial and temporal changes in the ecoenvironment quality (Jia et al, 2021;Maity et al, 2022). The application of remote sensing technology has the advantages of rapid, efficient, and wide-area observation, and it can accurately record ecological conditions on the land surface, including land use/cover changes, surface temperature changes, and vegetation succession processes (Shan et al, 2019;Ermida et al, 2020;Szewczak et al, 2020;Firozjaei et al, 2021).…”

How Can We Understand the Past from Now On? Three-Dimensional Modelling and Landscape Reconstruction of the Shuanghuaishu Site in the Central Plains of China

“…Based on the spectral information and morphological and other features in the images, we used the normalized difference water index (NDWI), the modified normalized difference water index (MNDWI), the maximum likelihood method and random forest to extract the edge information of the Yellow River water bodies. MNDWI and NDWI are ratio indexes that rely on the characteristics of river water in multispectral bands (such as the highest and lowest reflectance bands); the differences among land cover types are emphasised by the ratio, with the brightness of water bodies enhanced to their maximum value, while background features are suppressed in processed images [67,68]. The maximum likelihood method is important in supervised classification.…”

Comprehensive influence of water resources development and utilization on ecological environment in Taohe River basin

“…In addition, the development and utilization of water resources will also cause changes in land use types and ecological environment quality. Recently, the development of remote sensing technology has provided substantial data for ecosystem monitoring [5] . Different scholars discussed the land use change and ecological environment quality in different regions based on remote sensing ecological index, and found that human activities had a great impact on ecological environment [6][7][8] .…”