N deposition may accelerate grassland degradation succession from grasses- and sedges-dominated into forbs-dominated in overgrazed alpine grassland systems on Qinghai-Tibetan Plateau

Alpine grasslands are sensitive to grazing and atmospheric nitrogen (N) deposition. Despite increases in N deposition, few field studies have assessed the effects of grazing in conjunction with increased N deposition on alpine grassland vegetation.In this two-year field study, we examined the effect...

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Autores principales:	Hao Shen, Shikui Dong, Antonio DiTommaso, Jiannan Xiao, Yangliu Zhi
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	N deposition Overgrazing Plant functional groups Photosynthesis Respiration Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/ea6808f4e6ae4f3784598ce1c84da973
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spelling	oai:doaj.org-article:ea6808f4e6ae4f3784598ce1c84da9732021-12-01T04:55:20ZN deposition may accelerate grassland degradation succession from grasses- and sedges-dominated into forbs-dominated in overgrazed alpine grassland systems on Qinghai-Tibetan Plateau1470-160X10.1016/j.ecolind.2021.107898https://doaj.org/article/ea6808f4e6ae4f3784598ce1c84da9732021-10-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X2100563Xhttps://doaj.org/toc/1470-160XAlpine grasslands are sensitive to grazing and atmospheric nitrogen (N) deposition. Despite increases in N deposition, few field studies have assessed the effects of grazing in conjunction with increased N deposition on alpine grassland vegetation.In this two-year field study, we examined the effects of overgrazing and overgrazing plus N deposition on eco-physiological processes of alpine grassland plants at the functional group level. We found that both overgrazing and overgrazing plus N deposition altered species composition and the dominance of three plant functional groups (grasses, sedges, and forbs) in an alpine meadow and alpine steppe.In the overgrazing and overgrazing plus N deposition treatments, forbs dominated the plant community. Grass and sedge dominance decreased substantially, relative to a ungrazed treatment. The underlying eco-physiological processes that led to the forb-dominated plant community differed between the overgrazing and overgrazing plus N deposition treatments. Overgrazing plus N deposition increased forb dominance both directly by selective herbivory and indirectly by enhancing forb photosynthetic rates.Our results suggest that overgrazing concomitant with increases in N deposition will likely shift the plant community composition of alpine grasslands on the Qinghai-Tibetan Plateau from grass/sedge communities to forb-dominated communities in the future.Hao ShenShikui DongAntonio DiTommasoJiannan XiaoYangliu ZhiElsevierarticleN depositionOvergrazingPlant functional groupsPhotosynthesisRespirationEcologyQH540-549.5ENEcological Indicators, Vol 129, Iss , Pp 107898- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	N deposition Overgrazing Plant functional groups Photosynthesis Respiration Ecology QH540-549.5
spellingShingle	N deposition Overgrazing Plant functional groups Photosynthesis Respiration Ecology QH540-549.5 Hao Shen Shikui Dong Antonio DiTommaso Jiannan Xiao Yangliu Zhi N deposition may accelerate grassland degradation succession from grasses- and sedges-dominated into forbs-dominated in overgrazed alpine grassland systems on Qinghai-Tibetan Plateau
description	Alpine grasslands are sensitive to grazing and atmospheric nitrogen (N) deposition. Despite increases in N deposition, few field studies have assessed the effects of grazing in conjunction with increased N deposition on alpine grassland vegetation.In this two-year field study, we examined the effects of overgrazing and overgrazing plus N deposition on eco-physiological processes of alpine grassland plants at the functional group level. We found that both overgrazing and overgrazing plus N deposition altered species composition and the dominance of three plant functional groups (grasses, sedges, and forbs) in an alpine meadow and alpine steppe.In the overgrazing and overgrazing plus N deposition treatments, forbs dominated the plant community. Grass and sedge dominance decreased substantially, relative to a ungrazed treatment. The underlying eco-physiological processes that led to the forb-dominated plant community differed between the overgrazing and overgrazing plus N deposition treatments. Overgrazing plus N deposition increased forb dominance both directly by selective herbivory and indirectly by enhancing forb photosynthetic rates.Our results suggest that overgrazing concomitant with increases in N deposition will likely shift the plant community composition of alpine grasslands on the Qinghai-Tibetan Plateau from grass/sedge communities to forb-dominated communities in the future.
format	article
author	Hao Shen Shikui Dong Antonio DiTommaso Jiannan Xiao Yangliu Zhi
author_facet	Hao Shen Shikui Dong Antonio DiTommaso Jiannan Xiao Yangliu Zhi
author_sort	Hao Shen
title	N deposition may accelerate grassland degradation succession from grasses- and sedges-dominated into forbs-dominated in overgrazed alpine grassland systems on Qinghai-Tibetan Plateau
title_short	N deposition may accelerate grassland degradation succession from grasses- and sedges-dominated into forbs-dominated in overgrazed alpine grassland systems on Qinghai-Tibetan Plateau
title_full	N deposition may accelerate grassland degradation succession from grasses- and sedges-dominated into forbs-dominated in overgrazed alpine grassland systems on Qinghai-Tibetan Plateau
title_fullStr	N deposition may accelerate grassland degradation succession from grasses- and sedges-dominated into forbs-dominated in overgrazed alpine grassland systems on Qinghai-Tibetan Plateau
title_full_unstemmed	N deposition may accelerate grassland degradation succession from grasses- and sedges-dominated into forbs-dominated in overgrazed alpine grassland systems on Qinghai-Tibetan Plateau
title_sort	n deposition may accelerate grassland degradation succession from grasses- and sedges-dominated into forbs-dominated in overgrazed alpine grassland systems on qinghai-tibetan plateau
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/ea6808f4e6ae4f3784598ce1c84da973
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N deposition may accelerate grassland degradation succession from grasses- and sedges-dominated into forbs-dominated in overgrazed alpine grassland systems on Qinghai-Tibetan Plateau

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