气候变化领域集成服务门户(CCPortal): Litter accumulation suppresses grass production but facilitates shrub expansion in a long-term fenced grassland

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DOI	10.1002/ecs2.4844
	Litter accumulation suppresses grass production but facilitates shrub expansion in a long-term fenced grassland
	Zhang, Yiwen; Chang, Xiaofeng; Zhang, Yuwei; Wilkes, Andreas; Wang, Guojie
发表日期	2024
ISSN	2150-8925
起始页码	15
结束页码	4
卷号	15 期号:4
英文摘要	Shrub expansion is increasing in grasslands worldwide and has profound effects on biodiversity and ecosystem functions. Shrub expansion has primarily been explained by extrinsic factors such as climate change and human activities, yet the roles of intrinsic shrub demographic population dynamic and shrub-grass interaction remain poorly understood. With a paired mown and exclosure comparison experiment and baseline levels of shrub abundance in a semiarid grassland, we confirmed that long-term livestock exclusion promotes expansion of two native shrubs, Artemisia sacrorum and Caragana brachypoda. Shrub abundance increased during the livestock exclusion period. Shrub biomass in fenced plots was about 5- to 10-fold greater than in mown plots. Both increase in population density and individual size (especially height) contributed to shrub increase. The mechanism behind this was the divergent effects of litter accumulation on shrubs and grasses. Litter accumulation suppressed grass production, while facilitating shrub recruitment and growth. Our findings highlight the potential role of litter accumulation-mediated shifts in shrub-grass interactions, which should be incorporated into grazing top-down control to better predict the restoration outcomes of grassland management changes. The identified internal biotic mechanism raises the possibility that removal of accumulated litter by grazing or mowing may be an alternative way to maintain or restore a grass-dominated state in shrub expansion areas.
英文关键词	biotic resistance; Loess Plateau; long-term fencing; shrub encroachment; shrub-grass interaction
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Ecology
WOS记录号	WOS:001200422300001
来源期刊	ECOSPHERE
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/297326
作者单位	Northwest A&F University - China; Northwest A&F University - China; Chinese Academy of Sciences; Institute of Soil & Water Conservation (ISWC), CAS; Pennsylvania Commonwealth System of Higher Education (PCSHE); Pennsylvania State University; Pennsylvania State University - University Park
推荐引用方式 GB/T 7714	Zhang, Yiwen,Chang, Xiaofeng,Zhang, Yuwei,et al. Litter accumulation suppresses grass production but facilitates shrub expansion in a long-term fenced grassland[J],2024,15(4).
APA	Zhang, Yiwen,Chang, Xiaofeng,Zhang, Yuwei,Wilkes, Andreas,&Wang, Guojie.(2024).Litter accumulation suppresses grass production but facilitates shrub expansion in a long-term fenced grassland.ECOSPHERE,15(4).
MLA	Zhang, Yiwen,et al."Litter accumulation suppresses grass production but facilitates shrub expansion in a long-term fenced grassland".ECOSPHERE 15.4(2024).