Sources and routes from terrestrial exogenous pollutants affect phytoplankton biomass in reservoir bays

Reservoir bays, at the terrestrial and water boundary, where water fluidity slows down and self-purification ability turns weak, hence they are especially sensitive to terrestrial exogenous pollutants, even resulting in eutrophication. According to N:P, water nutrient types can be divided into N lim...

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Autor principal:	R. Y. Hu
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	chlorophyll-a nonpoint pollution n:p ratio partial least squares structural equation model (pls-sem) Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506
Acceso en línea:	https://doaj.org/article/0c4bbf2f380048588a40e8c2911009be
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spelling	oai:doaj.org-article:0c4bbf2f380048588a40e8c2911009be2021-11-23T18:57:05ZSources and routes from terrestrial exogenous pollutants affect phytoplankton biomass in reservoir bays1606-97491607-079810.2166/ws.2021.148https://doaj.org/article/0c4bbf2f380048588a40e8c2911009be2021-11-01T00:00:00Zhttp://ws.iwaponline.com/content/21/7/3913https://doaj.org/toc/1606-9749https://doaj.org/toc/1607-0798Reservoir bays, at the terrestrial and water boundary, where water fluidity slows down and self-purification ability turns weak, hence they are especially sensitive to terrestrial exogenous pollutants, even resulting in eutrophication. According to N:P, water nutrient types can be divided into N limited, P limited and N + P limited classes. Phytoplankton biomass is represented by chlorophyll a, which is one of the sensitive indicators of water eutrophication. Comprehensively tracing non-point pollution from terrestrial exogenous pollutants (fertilizer, soil release, anthropogenic discharge) to water nutrients that happen in reservoir bays is of great significance. This paper identified the dominant environmental variables and nutrients' limited types of reservoir bays at storage and discharge periods, and constructed a partial least squares structural equation model (PLS-SEM) to explore the impacts of terrestrial exogenous pollutants. Results showed that in the storage period, water contamination mainly came from residential discharge and soil endogenous release, and the total contribution rate reached 61%. In the discharge period, with the increase of rainfall–runoff erosion, the explanatory ability of land use, topography and landscape pattern to water quality increased, up to 58%. The dominant nutrient limited types of reservoir bays were P limited (35%–47%) and N + P limited (35%–59%) at both stages, N limited situations were less than 20% and generally appeared in the storage period. Whatever the nutrient limited type was, phosphorus always had a higher effect on phytoplankton biomass. In the N limited situation, nitrogen came mainly from soil release (total effect = 0.6) and phosphorus from fertilizer (total effect = 0.22) and soil release (total effect = 0.17). In the P limited situation, all three sources had almost high effects on nitrogen, phosphorus, and phytoplankton biomass. In the N + P limited situation, anthropogenic discharge was the main source of nutrients and the primary threat factor for phytoplankton biomass. The approaches employed in this study could be generalized to other basins and the results were significant for early warning and controlling water eutrophication. HIGHLIGHTS The relationships between the terrestrial exogenous input with the nutrient limited types were explored.; The dominant nutrient limited types of reservoir bays were P limited and N + P limited at both stages.; Whatever the nutrients limited type was, phosphorus always had higher effect on phytoplankton biomass.; The effects and contributions of fertilizer, soil release and anthropogenic discharge to water nutrients and phytoplankton biomass were calculated.;R. Y. HuIWA Publishingarticlechlorophyll-anonpoint pollutionn:p ratiopartial least squares structural equation model (pls-sem)Water supply for domestic and industrial purposesTD201-500River, lake, and water-supply engineering (General)TC401-506ENWater Supply, Vol 21, Iss 7, Pp 3913-3931 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	chlorophyll-a nonpoint pollution n:p ratio partial least squares structural equation model (pls-sem) Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506
spellingShingle	chlorophyll-a nonpoint pollution n:p ratio partial least squares structural equation model (pls-sem) Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506 R. Y. Hu Sources and routes from terrestrial exogenous pollutants affect phytoplankton biomass in reservoir bays
description	Reservoir bays, at the terrestrial and water boundary, where water fluidity slows down and self-purification ability turns weak, hence they are especially sensitive to terrestrial exogenous pollutants, even resulting in eutrophication. According to N:P, water nutrient types can be divided into N limited, P limited and N + P limited classes. Phytoplankton biomass is represented by chlorophyll a, which is one of the sensitive indicators of water eutrophication. Comprehensively tracing non-point pollution from terrestrial exogenous pollutants (fertilizer, soil release, anthropogenic discharge) to water nutrients that happen in reservoir bays is of great significance. This paper identified the dominant environmental variables and nutrients' limited types of reservoir bays at storage and discharge periods, and constructed a partial least squares structural equation model (PLS-SEM) to explore the impacts of terrestrial exogenous pollutants. Results showed that in the storage period, water contamination mainly came from residential discharge and soil endogenous release, and the total contribution rate reached 61%. In the discharge period, with the increase of rainfall–runoff erosion, the explanatory ability of land use, topography and landscape pattern to water quality increased, up to 58%. The dominant nutrient limited types of reservoir bays were P limited (35%–47%) and N + P limited (35%–59%) at both stages, N limited situations were less than 20% and generally appeared in the storage period. Whatever the nutrient limited type was, phosphorus always had a higher effect on phytoplankton biomass. In the N limited situation, nitrogen came mainly from soil release (total effect = 0.6) and phosphorus from fertilizer (total effect = 0.22) and soil release (total effect = 0.17). In the P limited situation, all three sources had almost high effects on nitrogen, phosphorus, and phytoplankton biomass. In the N + P limited situation, anthropogenic discharge was the main source of nutrients and the primary threat factor for phytoplankton biomass. The approaches employed in this study could be generalized to other basins and the results were significant for early warning and controlling water eutrophication. HIGHLIGHTS The relationships between the terrestrial exogenous input with the nutrient limited types were explored.; The dominant nutrient limited types of reservoir bays were P limited and N + P limited at both stages.; Whatever the nutrients limited type was, phosphorus always had higher effect on phytoplankton biomass.; The effects and contributions of fertilizer, soil release and anthropogenic discharge to water nutrients and phytoplankton biomass were calculated.;
format	article
author	R. Y. Hu
author_facet	R. Y. Hu
author_sort	R. Y. Hu
title	Sources and routes from terrestrial exogenous pollutants affect phytoplankton biomass in reservoir bays
title_short	Sources and routes from terrestrial exogenous pollutants affect phytoplankton biomass in reservoir bays
title_full	Sources and routes from terrestrial exogenous pollutants affect phytoplankton biomass in reservoir bays
title_fullStr	Sources and routes from terrestrial exogenous pollutants affect phytoplankton biomass in reservoir bays
title_full_unstemmed	Sources and routes from terrestrial exogenous pollutants affect phytoplankton biomass in reservoir bays
title_sort	sources and routes from terrestrial exogenous pollutants affect phytoplankton biomass in reservoir bays
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/0c4bbf2f380048588a40e8c2911009be
work_keys_str_mv	AT ryhu sourcesandroutesfromterrestrialexogenouspollutantsaffectphytoplanktonbiomassinreservoirbays
_version_	1718416135475429376

Sources and routes from terrestrial exogenous pollutants affect phytoplankton biomass in reservoir bays

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