气候变化领域集成服务门户(CCPortal): Degradation shifts plant communities from S- to R-strategy in an alpine meadow, Tibetan Plateau

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DOI	10.1016/j.scitotenv.2021.149572
	Degradation shifts plant communities from S- to R-strategy in an alpine meadow, Tibetan Plateau
	Zhou, Tiancai; Hou, Ge; Sun, Jian; Zong, Ning; Shi, Peili
通讯作者	Shi, PL (通讯作者)
发表日期	2021
ISSN	0048-9697
EISSN	1879-1026
卷号	800
英文摘要	The replacement of dominant sedges/grasses with secondary forbs is common in alpine rangelands, but the un-derlying plant ecological strategies and their relevance to leaf traits and their variabilities of different plant func-tional groups remain largely unknown. Here, we measured key leaf traits and analyzed the competitor, stress-tolerator and ruderal (CSR) strategies of major species with different functional groups (sedges, grasses and forbs) in an alpine meadow along a degradation gradient on the Tibetan Plateau. Our results indicated that S-selected species were dominant in both non-degraded (C:S:R = 1:95:4%) and severely degraded (C:S:R = 2:87:11%) meadows. However, there was a shift from S-to R-strategy in the communities after rangeland degra-dation. More specifically, sedges and grasses with a conservative strategy maintained stronger S-strategy to tol-erate degraded and stressful conditions. In contrast, forbs with an opportunistic strategy (increase 9.5% in R-score) tended to adapt to degraded stages. Moreover, 51.1% and 23.9% of the increased R-scores in forbs were accounted by leaf mass per area and specific leaf area, respectively. Generally, higher leaf water and nitrogen con-tents coupled with larger variations in leaf traits and flexible SR strategies in forbs enabled them to capitalize on lower soil water and nutrient availability. Our findings highlighted that the contrasting strategies of plant species in response to the decrease in available resources might lead to niche expansion of secondary forbs and loss of diversity in the degraded alpine meadow. The emerging alternative stable states in the degraded rangelands might bring about a predicament for rangeland restoration. (c) 2021 Published by Elsevier B.V.
关键词	TRAITS NITROGEN DISTURBANCE COMPETITION GRASSLANDS DIVERSITY DOMINANCE DYNAMICS BIOMASS STEPPE
英文关键词	CSR strategy; Leaf traits; Rangeland degradation; Function groups; Niche expansion; Tibetan Plateau
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS记录号	WOS:000701792800009
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260155
推荐引用方式 GB/T 7714	Zhou, Tiancai,Hou, Ge,Sun, Jian,et al. Degradation shifts plant communities from S- to R-strategy in an alpine meadow, Tibetan Plateau[J]. 中国科学院青藏高原研究所,2021,800.
APA	Zhou, Tiancai,Hou, Ge,Sun, Jian,Zong, Ning,&Shi, Peili.(2021).Degradation shifts plant communities from S- to R-strategy in an alpine meadow, Tibetan Plateau.SCIENCE OF THE TOTAL ENVIRONMENT,800.
MLA	Zhou, Tiancai,et al."Degradation shifts plant communities from S- to R-strategy in an alpine meadow, Tibetan Plateau".SCIENCE OF THE TOTAL ENVIRONMENT 800(2021).