气候变化领域集成服务门户(CCPortal): Disentangling climatic and anthropogenic contributions to nonlinear dynamics of alpine grassland productivity on the Qinghai-Tibetan Plateau

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DOI	10.1016/j.jenvman.2020.111875
	Disentangling climatic and anthropogenic contributions to nonlinear dynamics of alpine grassland productivity on the Qinghai-Tibetan Plateau
	Wu J.; Li M.; Zhang X.; Fiedler S.; Gao Q.; Zhou Y.; Cao W.; Hassan W.; Mărgărint M.C.; Tarolli P.; Tietjen B.
发表日期	2021
ISSN	3014797
卷号	281
英文摘要	Alpine grasslands on the Qinghai-Tibetan Plateau are sensitive and vulnerable to climate change and human activities. Climate warming and overgrazing have already caused degradation in a large fraction of alpine grasslands on this plateau. However, it remains unclear how human activities (mainly livestock grazing) regulates vegetation dynamics under climate change. Here, alpine grassland productivity (substituted with the normalized difference vegetation index, NDVI) is hypothesized to vary in a nonlinear trajectory to follow climate fluctuations and human disturbances. With generalized additive mixed modelling (GAMM) and residual-trend (RESTREND) analysis together, both magnitude and direction of climatic (in terms of temperature, precipitation, and radiation) and anthropogenic impacts on NDVI variation were examined across alpine meadows, steppes, and desert-steppes on the Qinghai-Tibetan Plateau. The results revealed that accelerating warming and greening, respectively, took place in 76.2% and 78.8% of alpine grasslands on the Qinghai-Tibetan Plateau. The relative importance of temperature, precipitation, and radiation impacts was comparable, between 20.4% and 24.8%, and combined to explain 66.2% of NDVI variance at the pixel scale. The human influence was strengthening and weakening, respectively, in 15.5% and 14.3% of grassland pixels, being slightly larger than any sole climatic variable across the entire plateau. Anthropogenic and climatic factors can be in opposite ways to affect alpine grasslands, even within the same grassland type, likely regulated by plant community assembly and species functional traits. Therefore, the underlying mechanisms of how plant functional diversity regulates nonlinear ecosystem response to climatic and anthropogenic stresses should be carefully explored in the future. © 2020 Elsevier Ltd
英文关键词	Anthropogenic impacts; Climate fluctuations; Ecosystem non-linearity; Grassland productivity; Human disturbance; Vegetation dynamics
语种	英语
scopus关键词	Journal of Environmental Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/158268
作者单位	Institute of Environment and Sustainable Development in Agriculture; Chinese Academy of Agricultural Sciences; Beijing; 100081; China; Freie Universität Berlin; Institute of Biology; Theoretical Ecology; Berlin; 14195; Germany; Lhasa National Ecological Research Station; Key Laboratory of Ecosystem Network Observation and Modelling; Institute of Geographic Sciences and Natural Resources Research; Chinese Academy of Sciences; Beijing; 100101; China; School of Geographic Sciences; Nantong University; Nantong; Jiangsu Province 226007; China; University Bayreuth; Department of Ecological Modelling; Bayreuth; 95448; Germany; Department of Geography; Oklahoma State University; StillwaterOK 74078; United States; Department of Land; Environment; Agriculture and Forestry; University of Padova; Legnaro (PD)35020; Italy; Department of Geography; Geography and Geology Faculty; Alexandru Ioan Cuza University of Iaşi; RO; Iaşi; 700505; Romania; Berlin Brandenburg Institute of Advanced Biodiversity Research; Berlin; 1...
推荐引用方式 GB/T 7714	Wu J.,Li M.,Zhang X.,et al. Disentangling climatic and anthropogenic contributions to nonlinear dynamics of alpine grassland productivity on the Qinghai-Tibetan Plateau[J],2021,281.
APA	Wu J..,Li M..,Zhang X..,Fiedler S..,Gao Q..,...&Tietjen B..(2021).Disentangling climatic and anthropogenic contributions to nonlinear dynamics of alpine grassland productivity on the Qinghai-Tibetan Plateau.,281.
MLA	Wu J.,et al."Disentangling climatic and anthropogenic contributions to nonlinear dynamics of alpine grassland productivity on the Qinghai-Tibetan Plateau".281(2021).