N and P fertilization enhanced carbon decomposition function by shifting microbes towards an r-selected community in meadow grassland soils

Applications of mineral nitrogen (N) and phosphorus (P) fertilizer to grasslands become more frequently in recent decade, aiming to improve the grass production. Nonetheless, the ecological impacts of N and P fertilizer on ecosystem components, especially the belowground soil microbes, are not well...

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Autores principales:	Zhihui Wang, Zhirui Wang, Tianpeng Li, Cong Wang, Ning Dang, Ruzhen Wang, Yong Jiang, Hongyi Wang, Hui Li
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	N fertilization P fertilization Bacterial diversity Bacterial community composition Bacterial function prediction Meadow grassland Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/80ae09c1c7f044e697ab74b87350ed62
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spelling	oai:doaj.org-article:80ae09c1c7f044e697ab74b87350ed622021-12-01T05:02:11ZN and P fertilization enhanced carbon decomposition function by shifting microbes towards an r-selected community in meadow grassland soils1470-160X10.1016/j.ecolind.2021.108306https://doaj.org/article/80ae09c1c7f044e697ab74b87350ed622021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X21009717https://doaj.org/toc/1470-160XApplications of mineral nitrogen (N) and phosphorus (P) fertilizer to grasslands become more frequently in recent decade, aiming to improve the grass production. Nonetheless, the ecological impacts of N and P fertilizer on ecosystem components, especially the belowground soil microbes, are not well acknowledged in grasslands ecosystem. We investigated the responses of plant traits, soil properties, bacterial community composition and potential functions to 5-year N and P fertilization in a mid-high latitude meadow grassland in Inner Mongolia, China. Bacterial species richness and diversity significantly (P < 0.05) decreased under combined N and P fertilization treatment. The overall bacterial community composition was significantly (PERMANOVA, P < 0.05) changed by N and P fertilization. In specific, N and P fertilization increased the relative abundance of the nominated r-strategists (copiotrophs), such as Actiobacteria, Candidatus Saccharibacteria, and Firmicutes; whereas reduced the relative abundance of the putative K-strategists (oligotrophs), including Acidobacteria, Gammaproteobacteria, and Deltaproteobacteria. As a consequence, the ratio of r-strategists to K strategists (r/K ratio) increased under nutrients addition. The shifts towards an r-selected community were further verified by the increased averaged rRNA operon copy number (rrn) of bacterial communigy. Soil N cycling process was inhibited by N fertilization, whereas soil C metabolizing function was accelerated by N and P fertilization. It implies that application of N and P fertilization will increase the risk of C loss in this region. The present study deepens our knowledge on the impacts of N and P fertilization on soil biotic and abiotic parameters in an organic-carbon-rich meadow grassland ecosystem. It provides a reference for designing a sustainable grassland management that can balance the grass yield and environment protection.Zhihui WangZhirui WangTianpeng LiCong WangNing DangRuzhen WangYong JiangHongyi WangHui LiElsevierarticleN fertilizationP fertilizationBacterial diversityBacterial community compositionBacterial function predictionMeadow grasslandEcologyQH540-549.5ENEcological Indicators, Vol 132, Iss , Pp 108306- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	N fertilization P fertilization Bacterial diversity Bacterial community composition Bacterial function prediction Meadow grassland Ecology QH540-549.5
spellingShingle	N fertilization P fertilization Bacterial diversity Bacterial community composition Bacterial function prediction Meadow grassland Ecology QH540-549.5 Zhihui Wang Zhirui Wang Tianpeng Li Cong Wang Ning Dang Ruzhen Wang Yong Jiang Hongyi Wang Hui Li N and P fertilization enhanced carbon decomposition function by shifting microbes towards an r-selected community in meadow grassland soils
description	Applications of mineral nitrogen (N) and phosphorus (P) fertilizer to grasslands become more frequently in recent decade, aiming to improve the grass production. Nonetheless, the ecological impacts of N and P fertilizer on ecosystem components, especially the belowground soil microbes, are not well acknowledged in grasslands ecosystem. We investigated the responses of plant traits, soil properties, bacterial community composition and potential functions to 5-year N and P fertilization in a mid-high latitude meadow grassland in Inner Mongolia, China. Bacterial species richness and diversity significantly (P < 0.05) decreased under combined N and P fertilization treatment. The overall bacterial community composition was significantly (PERMANOVA, P < 0.05) changed by N and P fertilization. In specific, N and P fertilization increased the relative abundance of the nominated r-strategists (copiotrophs), such as Actiobacteria, Candidatus Saccharibacteria, and Firmicutes; whereas reduced the relative abundance of the putative K-strategists (oligotrophs), including Acidobacteria, Gammaproteobacteria, and Deltaproteobacteria. As a consequence, the ratio of r-strategists to K strategists (r/K ratio) increased under nutrients addition. The shifts towards an r-selected community were further verified by the increased averaged rRNA operon copy number (rrn) of bacterial communigy. Soil N cycling process was inhibited by N fertilization, whereas soil C metabolizing function was accelerated by N and P fertilization. It implies that application of N and P fertilization will increase the risk of C loss in this region. The present study deepens our knowledge on the impacts of N and P fertilization on soil biotic and abiotic parameters in an organic-carbon-rich meadow grassland ecosystem. It provides a reference for designing a sustainable grassland management that can balance the grass yield and environment protection.
format	article
author	Zhihui Wang Zhirui Wang Tianpeng Li Cong Wang Ning Dang Ruzhen Wang Yong Jiang Hongyi Wang Hui Li
author_facet	Zhihui Wang Zhirui Wang Tianpeng Li Cong Wang Ning Dang Ruzhen Wang Yong Jiang Hongyi Wang Hui Li
author_sort	Zhihui Wang
title	N and P fertilization enhanced carbon decomposition function by shifting microbes towards an r-selected community in meadow grassland soils
title_short	N and P fertilization enhanced carbon decomposition function by shifting microbes towards an r-selected community in meadow grassland soils
title_full	N and P fertilization enhanced carbon decomposition function by shifting microbes towards an r-selected community in meadow grassland soils
title_fullStr	N and P fertilization enhanced carbon decomposition function by shifting microbes towards an r-selected community in meadow grassland soils
title_full_unstemmed	N and P fertilization enhanced carbon decomposition function by shifting microbes towards an r-selected community in meadow grassland soils
title_sort	n and p fertilization enhanced carbon decomposition function by shifting microbes towards an r-selected community in meadow grassland soils
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/80ae09c1c7f044e697ab74b87350ed62
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N and P fertilization enhanced carbon decomposition function by shifting microbes towards an r-selected community in meadow grassland soils

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