气候变化领域集成服务门户(CCPortal): Spatiotemporal variations of leaf senescence velocity on the Tibetan Plateau grasslands

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DOI	10.1016/j.ecolind.2023.111094
	Spatiotemporal variations of leaf senescence velocity on the Tibetan Plateau grasslands
	Tang, Yusong; Chen, Rui; Xie, Jiangliu; Ma, Dujuan; Wang, Changjing; Wang, Cong; Xie, Qiaoyun; Yin, Gaofei
发表日期	2023
ISSN	1470-160X
EISSN	1872-7034
卷号	156
英文摘要	Leaf senescence plays a pivotal role in the regulation of carbon and nutrient cycles within terrestrial ecosystems. However, our understanding of leaf senescence velocity (LSV) remains comparatively limited when compared to the end of the growing season (EOS). In this study, we extracted the LSV in Tibet Plateau (TP) over the period 2001-2018 based on the satellite-derived normalized difference greenness index (NDGI), then we evaluated the influences of climate drivers on the spatio-temporal variations of LSV. Lastly, we explored the implications of LSV on vegetation growth by analyzing the correlation between LSV and the start of growing season (SOS) and the annual net primary production (NPP). Our findings revealed that the multi-year averaged LSV ranged from 30 to 70% mon-1 and displayed a discernible spatial gradient, declining from west to east, and the spatial pattern of LSV was mainly controlled by radiation. Trend tests and partial correlation analyses unveiled a temporal decrease in LSV within the central TP region, attributed to rising temperatures, while an increase was observed in the southwestern TP due to water deficits. We also found that LSV had a strong impact on current-year net NPP and following-year SOS. This suggests that LSV may play a significant role in regulating carbon exchange during the current year and influencing the onset of spring green-up in the subsequent year. By emphasizing the continuous nature of leaf senescence, our study provides fresh insights into the intricate interactions between vegetation growth and climate change, contributing to the existing body of knowledge in this field.
关键词	Leaf senescence velocity Tibetan Plateau Normalized difference greenness index Vegetation phenology
英文关键词	AUTUMN PHENOLOGY; GENE-EXPRESSION; VEGETATION; CLIMATE; DYNAMICS; STORAGE; CHINA; DATE; DIE
WOS研究方向	Biodiversity Conservation ; Environmental Sciences
WOS记录号	WOS:001095907600001
来源期刊	ECOLOGICAL INDICATORS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283712
作者单位	Southwest Jiaotong University; Central China Normal University; Central China Normal University; University of Western Australia
推荐引用方式 GB/T 7714	Tang, Yusong,Chen, Rui,Xie, Jiangliu,et al. Spatiotemporal variations of leaf senescence velocity on the Tibetan Plateau grasslands[J],2023,156.
APA	Tang, Yusong.,Chen, Rui.,Xie, Jiangliu.,Ma, Dujuan.,Wang, Changjing.,...&Yin, Gaofei.(2023).Spatiotemporal variations of leaf senescence velocity on the Tibetan Plateau grasslands.ECOLOGICAL INDICATORS,156.
MLA	Tang, Yusong,et al."Spatiotemporal variations of leaf senescence velocity on the Tibetan Plateau grasslands".ECOLOGICAL INDICATORS 156(2023).