Incorporating soil aggregate-associated indicators into evaluating ecological responses of degraded estuarine wetlands to freshwater replenishment at different intensity: A case study from the Yellow River Delta, China

Management intensity was considered an important factor in evaluating and regulating the anthropogenic restoration measures for a degraded ecosystem. By comparing selected conventional soil physicochemical, microbial and incorporating aggregate-associated indices between wetland plot with high-inten...

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Autores principales:	Ziwen Ma, Junhong Bai, Rong Xiao, Chen Wang, Yuan Cui, Jiang Wu, Jin Xu, Zhenming Zhang, Mingxiang Zhang
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Wetland restoration Freshwater replenishment intensity Soil microbial community Soil aggregate Yellow River Delta Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/c8e6c9e71e7140cabe2d20a3d8d132c7
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spelling	oai:doaj.org-article:c8e6c9e71e7140cabe2d20a3d8d132c72021-12-01T04:33:10ZIncorporating soil aggregate-associated indicators into evaluating ecological responses of degraded estuarine wetlands to freshwater replenishment at different intensity: A case study from the Yellow River Delta, China1470-160X10.1016/j.ecolind.2020.107039https://doaj.org/article/c8e6c9e71e7140cabe2d20a3d8d132c72021-02-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X2030978Xhttps://doaj.org/toc/1470-160XManagement intensity was considered an important factor in evaluating and regulating the anthropogenic restoration measures for a degraded ecosystem. By comparing selected conventional soil physicochemical, microbial and incorporating aggregate-associated indices between wetland plot with high-intensity freshwater replenishment (HI wetlands) and wetland plot with low-intensity freshwater replenishment (LI wetlands), edaphic responses of degraded estuarine wetlands to freshwater replenishment at different intensity were assessed in the present study. The results showed that high-intensity freshwater replenishment exerted better soil salinization and alkalization alleviation effects on degraded estuarine wetlands, which caused lower EC and pH values in HI wetlands than those in LI wetlands. And soil microbial biomass was promoted, with freshwater replenishment intensity increased, as indicated by MBC and total PLFAs. Minor alternation of soil microbial community composition was observed with an elevated abundance of arbuscular mycorrhizal fungi (AMF) in HI wetlands. On the other hand, freshwater replenishment at low intensity was found to contribute to organic matter accumulation, as indicated by both higher SOC concentrations and carbon stocks in LI wetlands than those in HI wetlands. And soil aggregate-associated indicators provided more scientific clues that freshwater replenishment at low intensity favored the formation of large macroaggregates, and thus supported higher soil aggregate stability. Moreover, a transfer of allocations of aggregate-associated carbon and nitrogen stocks from microaggregates to large macroaggregates was induced as the freshwater replenishment intensity decreased, and the principle governing factors were the proportion of large macroaggregates in soils, soil salinity and microbial decomposition rates based on multivariate statistical analysis. The findings of this study could provide basic data regarding soil physicochemical properties, microbial characteristics and soil structure stability in restored wetlands of the Yellow River Delta with freshwater replenishment at different intensity and guiding adaptive management strategies of freshwater replenishment to enhance the ecological functions of estuarine wetlands.Ziwen MaJunhong BaiRong XiaoChen WangYuan CuiJiang WuJin XuZhenming ZhangMingxiang ZhangElsevierarticleWetland restorationFreshwater replenishment intensitySoil microbial communitySoil aggregateYellow River DeltaEcologyQH540-549.5ENEcological Indicators, Vol 121, Iss , Pp 107039- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Wetland restoration Freshwater replenishment intensity Soil microbial community Soil aggregate Yellow River Delta Ecology QH540-549.5
spellingShingle	Wetland restoration Freshwater replenishment intensity Soil microbial community Soil aggregate Yellow River Delta Ecology QH540-549.5 Ziwen Ma Junhong Bai Rong Xiao Chen Wang Yuan Cui Jiang Wu Jin Xu Zhenming Zhang Mingxiang Zhang Incorporating soil aggregate-associated indicators into evaluating ecological responses of degraded estuarine wetlands to freshwater replenishment at different intensity: A case study from the Yellow River Delta, China
description	Management intensity was considered an important factor in evaluating and regulating the anthropogenic restoration measures for a degraded ecosystem. By comparing selected conventional soil physicochemical, microbial and incorporating aggregate-associated indices between wetland plot with high-intensity freshwater replenishment (HI wetlands) and wetland plot with low-intensity freshwater replenishment (LI wetlands), edaphic responses of degraded estuarine wetlands to freshwater replenishment at different intensity were assessed in the present study. The results showed that high-intensity freshwater replenishment exerted better soil salinization and alkalization alleviation effects on degraded estuarine wetlands, which caused lower EC and pH values in HI wetlands than those in LI wetlands. And soil microbial biomass was promoted, with freshwater replenishment intensity increased, as indicated by MBC and total PLFAs. Minor alternation of soil microbial community composition was observed with an elevated abundance of arbuscular mycorrhizal fungi (AMF) in HI wetlands. On the other hand, freshwater replenishment at low intensity was found to contribute to organic matter accumulation, as indicated by both higher SOC concentrations and carbon stocks in LI wetlands than those in HI wetlands. And soil aggregate-associated indicators provided more scientific clues that freshwater replenishment at low intensity favored the formation of large macroaggregates, and thus supported higher soil aggregate stability. Moreover, a transfer of allocations of aggregate-associated carbon and nitrogen stocks from microaggregates to large macroaggregates was induced as the freshwater replenishment intensity decreased, and the principle governing factors were the proportion of large macroaggregates in soils, soil salinity and microbial decomposition rates based on multivariate statistical analysis. The findings of this study could provide basic data regarding soil physicochemical properties, microbial characteristics and soil structure stability in restored wetlands of the Yellow River Delta with freshwater replenishment at different intensity and guiding adaptive management strategies of freshwater replenishment to enhance the ecological functions of estuarine wetlands.
format	article
author	Ziwen Ma Junhong Bai Rong Xiao Chen Wang Yuan Cui Jiang Wu Jin Xu Zhenming Zhang Mingxiang Zhang
author_facet	Ziwen Ma Junhong Bai Rong Xiao Chen Wang Yuan Cui Jiang Wu Jin Xu Zhenming Zhang Mingxiang Zhang
author_sort	Ziwen Ma
title	Incorporating soil aggregate-associated indicators into evaluating ecological responses of degraded estuarine wetlands to freshwater replenishment at different intensity: A case study from the Yellow River Delta, China
title_short	Incorporating soil aggregate-associated indicators into evaluating ecological responses of degraded estuarine wetlands to freshwater replenishment at different intensity: A case study from the Yellow River Delta, China
title_full	Incorporating soil aggregate-associated indicators into evaluating ecological responses of degraded estuarine wetlands to freshwater replenishment at different intensity: A case study from the Yellow River Delta, China
title_fullStr	Incorporating soil aggregate-associated indicators into evaluating ecological responses of degraded estuarine wetlands to freshwater replenishment at different intensity: A case study from the Yellow River Delta, China
title_full_unstemmed	Incorporating soil aggregate-associated indicators into evaluating ecological responses of degraded estuarine wetlands to freshwater replenishment at different intensity: A case study from the Yellow River Delta, China
title_sort	incorporating soil aggregate-associated indicators into evaluating ecological responses of degraded estuarine wetlands to freshwater replenishment at different intensity: a case study from the yellow river delta, china
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/c8e6c9e71e7140cabe2d20a3d8d132c7
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Incorporating soil aggregate-associated indicators into evaluating ecological responses of degraded estuarine wetlands to freshwater replenishment at different intensity: A case study from the Yellow River Delta, China

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