气候变化领域集成服务门户(CCPortal): Rainy season onset mainly drives the spatiotemporal variability of spring vegetation green-up across alpine dry ecosystems on the Tibetan Plateau

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DOI	10.1038/s41598-020-75991-w
	Rainy season onset mainly drives the spatiotemporal variability of spring vegetation green-up across alpine dry ecosystems on the Tibetan Plateau
	Li, Xiang; Zhang, Lin; Luo, Tianxiang
通讯作者	Luo, TX (通讯作者)
发表日期	2020
ISSN	2045-2322
卷号	10 期号:1
英文摘要	It is still debatable whether temperature or precipitation mainly triggers spring vegetation green-up (SVG) in alpine dry ecosystems on the Tibetan Plateau. As phenological sensitivity to the arrival of monsoon-season rainfall would allow plants to simultaneously avoid drought and frost damages in the early growing season, we hypothesize that rainy season onset (RSO) rather than temperature mainly drives the spatiotemporal variability of SVG across alpine dry ecosystems over the Tibetan Plateau. Dates of RSO and SVG across 67 target areas nearby 67 weather stations over the Tibetan Plateau were calculated from time-series data of daily mean temperature and precipitation (1974-2013) and of the Normalized Difference Vegetation Index from the Moderate Resolution Imaging Spectroradiometer (2001-2013), respectively. Satellite-derived SVG was validated by 7-year observations (2007-2013) for leaf emergence of dominant species in alpine meadows along elevations (4400-5200 m) in Damxung of Tibet. We found that SVG generally synchronized with or was somewhat later than RSO although seasonal air temperatures were already continuously above 0 degrees C in 1 month before SVG dates. In pooled data across sites and years, the analysis of linear mixed model indicated that RSO (F=42.109) and its interactions with pre-SVG precipitation (F=6.767) and temperature (F=4.449) mainly explained the spatio-temporal variability of SVG, while pre-SVG temperature and its interaction with precipitation did not have significant effects on SVG. Our data supported the hypothesis, suggesting that synchronization of SVG and RSO is a general spring phenological strategy across alpine dry ecosystems under influence of monsoon climate.
关键词	CLIMATE-CHANGE ALTITUDINAL GRADIENT PHENOLOGY TEMPERATURE RESPONSES IMPACTS SHIFT PRODUCTIVITY MODEL DATES
语种	英语
WOS研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
WOS记录号	WOS:000589616100012
来源期刊	SCIENTIFIC REPORTS
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/259674
推荐引用方式 GB/T 7714	Li, Xiang,Zhang, Lin,Luo, Tianxiang. Rainy season onset mainly drives the spatiotemporal variability of spring vegetation green-up across alpine dry ecosystems on the Tibetan Plateau[J]. 中国科学院青藏高原研究所,2020,10(1).
APA	Li, Xiang,Zhang, Lin,&Luo, Tianxiang.(2020).Rainy season onset mainly drives the spatiotemporal variability of spring vegetation green-up across alpine dry ecosystems on the Tibetan Plateau.SCIENTIFIC REPORTS,10(1).
MLA	Li, Xiang,et al."Rainy season onset mainly drives the spatiotemporal variability of spring vegetation green-up across alpine dry ecosystems on the Tibetan Plateau".SCIENTIFIC REPORTS 10.1(2020).