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Analysis of water quality indexes and their relationships with vegetation using self-organizing map and geographically and temporally weighted regression.

Authors :
Feng, Zhaohui
Xu, Chengjian
Zuo, Yiping
Luo, Xi
Wang, Lingqing
Chen, Hao
Xie, Xiaojing
Yan, Dan
Liang, Tao
Source :
Environmental Research. Jan2023:Part 2, Vol. 216, pN.PAG-N.PAG. 1p.
Publication Year :
2023

Abstract

Natural vegetation has been proved to promote water purification in previous studies, while the relevant laws has not been excavated systematically. This research explored the relationships between vegetation cover and water quality indexes in Liaohe River Basin in China combined with self-organizing map (SOM) and geographically and temporally weighted regression (GTWR) innovatively and systematically based on the distributing heterogeneity of water quality conditions. Results showed that the central and northeast regions of the study area had serious organic and nutrient pollution, which needed targeted treatment. And SOM verified that high vegetation coverage with retention potential of organic and inorganic pollutants as well as nutrients improved water quality to some degree, while the excessive discharges of pollutants still had serious threats to nearby water environment despite the purification function of vegetation. GTWR indicated that the waterside vegetation was beneficial for dissolved oxygen increasing and contributed to the decreasing of organic pollutants and inorganic pollutants with reducibility. Natural vegetation also obsorbed nutrients like TN and TP to some degree. However, the retential potential of nitrogen and organic pollutants became not obvious when there were heavy pollution, which demonstrated that pollution sources should be controlled despite the purification function of vegetation. This study implied that natural vegetation purified water quality to some degree, while this function could not be revealed when there was too heavy pollution. These findings underscore that the pollutant discharge should be controlled though the natural vegetation in ecosystem promoted the purification of water bodies. • Natural vegetation had a certain promoting effect on water quality improvement. • Excessive pollution impacted water quality though the vegetation purification. • Nitrogen absorption of vegetation became not obvious with heavy nitrogen pollution. • Pollutants with similar distribution patterns needed the targeted treatment. • Construction of waterfront vegetation is a good method to improve water quality. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00139351
Volume :
216
Database :
Academic Search Index
Journal :
Environmental Research
Publication Type :
Academic Journal
Accession number :
160368693
Full Text :
https://doi.org/10.1016/j.envres.2022.114587