干旱区生态环境知识资源中心(Arid): Change in grass hill size can signal species diversity changes and ecosystem state transitions during alpine wetland degradation

Arid

DOI	10.1016/j.ecolind.2021.108302
	Change in grass hill size can signal species diversity changes and ecosystem state transitions during alpine wetland degradation
	He, Mingrui; Xin, Chunming; Ma, Miaojun
通讯作者	Ma, MJ (corresponding author), Lanzhou Univ, Sch Life Sci, State Key Lab Grassland & Agroecosyst, Lanzhou 730000, Gansu, Peoples R China.
来源期刊	ECOLOGICAL INDICATORS
ISSN	1470-160X
EISSN	1872-7034
出版年	2021
卷号	132
英文摘要	The prospect of likely catastrophic transitions in ecosystems requires the development of early warning indicators that will provide advance warnings for undesired transitions. A grass hill is a unique microtopography that plays a crucial role in the functioning of wetland ecosystems. However, it is unclear whether grass hill size could serve as an important warning indicator to predict vegetation dynamics and ecosystem transitions during wetland degradation. Six degradation levels were selected along a grazing gradient in the alpine wetlands on the eastern Tibetan Plateau. General linear and segment regression were used to analyze whether grass hill area (GHA) can be used as an important warning indicator to predict biotic and abiotic factors and ecosystem transitions from typical alpine wetlands to meadows. The species diversity and biomass of aboveground vegetation increased slowly before the threshold point but decreased sharply after the threshold point (GHA (grass hill area) = 0.13 m2). The species diversity of both persistent and transient seed banks and the seed density of persistent seed banks also increased slowly but increased sharply before and after the threshold point (GHA = 0.2 m2). Soil moisture (SM), soil organic carbon (SOC) and total nitrogen (TN) decreased slowly but decreased sharply before and after the threshold point (GHA > 0.2 m2). Surprisingly, we also found the same threshold point (GHA = 0.13-0.2 m2) for the ecosystem transition from alpine wetlands to meadows as that for the other factors. GHA accurately predicted biotic (species diversity of vegetation and seed bank) and abiotic (SM, SOC, and TN) changes and the ecosystem transition from alpine wetlands to meadows. Thus, grass hill area is an effective warning indicator that could be used in future alpine wetland restoration and management.
英文关键词	Abiotic factor Alpine wetland Warning indicator Grass hill Soil seed bank Species diversity State transition Tibetan Plateau
类型	Article
语种	英语
开放获取类型	hybrid
收录类别	SCI-E
WOS记录号	WOS:000710621100002
WOS关键词	EARLY-WARNING INDICATORS ; SOIL SEED BANKS ; VEGETATION PATTERNS ; SLOWING-DOWN ; RESTORATION ; MICROTOPOGRAPHY ; DESERTIFICATION ; GERMINATION ; DYNAMICS ; SPHAGNUM
WOS类目	Biodiversity Conservation ; Environmental Sciences
WOS研究方向	Biodiversity & Conservation ; Environmental Sciences & Ecology
来源机构	兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/368130
作者单位	[He, Mingrui; Xin, Chunming; Ma, Miaojun] Lanzhou Univ, Sch Life Sci, State Key Lab Grassland & Agroecosyst, Lanzhou 730000, Gansu, Peoples R China
推荐引用方式 GB/T 7714	He, Mingrui,Xin, Chunming,Ma, Miaojun. Change in grass hill size can signal species diversity changes and ecosystem state transitions during alpine wetland degradation[J]. 兰州大学,2021,132.
APA	He, Mingrui,Xin, Chunming,&Ma, Miaojun.(2021).Change in grass hill size can signal species diversity changes and ecosystem state transitions during alpine wetland degradation.ECOLOGICAL INDICATORS,132.
MLA	He, Mingrui,et al."Change in grass hill size can signal species diversity changes and ecosystem state transitions during alpine wetland degradation".ECOLOGICAL INDICATORS 132(2021).