Spatial-Temporal Change of Land Use and Its Impact on Water Quality of East-Liao River Basin from 2000 to 2020

Mingxi Zhang,Aru Han,Guangzhi Rong,Jiquan Zhang,Xingpeng Liu,Zhijun Tong,Dao Riao

doi:10.3390/w13141955

Mingxi Zhang, Aru Han + Show 5 more

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https://doi.org/10.3390/w13141955

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Abstract

Land use change is an important driving force factor affecting the river water environment and directly affecting water quality. To analyze the impact of land use change on water quality change, this study first analyzed the land use change index of the study area. Then, the study area was divided into three subzones based on surface runoff. The relationship between the characteristics of land use change and the water quality grade was obtained by grey correlation analysis. The results showed that the land use types changed significantly in the study area since 2000, and water body and forest land were the two land types with the most significant changes. The transfer rate is cultivated field > forest land > construction land > grassland > unused land > water body. The entropy value of land use information is represented as Area I > Area III > Area II. The shift range of gravity center is forest land > grassland > water body > unused land > construction land > cultivated field. There is a strong correlation between land use change index and water quality, which can be improved and managed by changing the land use type. It is necessary to establish ecological protection areas or functional areas in Area I, artificial lawns or plantations shall be built in the river around the water body to intercept pollutants from non-point source pollution in Area II, and scientific and rational farming in the lower reaches of rivers can reduce non-point source pollution caused by farming.

Highlights

Land use is a dynamic process that refers to the way and purpose of humans’ use of the natural attributes of land [1], and land use change is a dominant process with negative effects on the structure and functioning of the surface ecological environment system [2,3,4]
The forest and grassland on both sides of the river have become a large number of sloping farmlands in China, and this kind of human activity leads to deterioration of the river water environment [11,12,13], it causes the large-area non-point source pollution and affects the river water quality in the basin
In the impact of land use change on the watershed water environment, studies were limited to reflect the linear relationship between land use and water quality [20,21,22] and the impact of land use change on the pollution level of river basins [23,24,25]

Summary

Introduction

Land use is a dynamic process that refers to the way and purpose of humans’ use of the natural attributes of land [1], and land use change is a dominant process with negative effects on the structure and functioning of the surface ecological environment system [2,3,4]. Land use is an essential driving forces factor that affects rivers’ hydrological changes [5,6,7] and causes changes in surface runoff [8,9,10]. In the impact of land use change on the watershed water environment, studies were limited to reflect the linear relationship between land use and water quality [20,21,22] and the impact of land use change on the pollution level of river basins [23,24,25]. The single land use change index cannot truly represent the change characteristics of water quality. Few studies have analyzed the impact of the multiple land use change index on the water environment

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