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	Spatial and temporal variations in the end date of the vegetation growing season throughout the Qinghai-Tibetan Plateau from 1982 to 2011
	Che M. L. ; Chen B. Z. ; Innes J. L. ; Wang G. Y. ; Dou X. M. ; Zhou T. M. ; Zhang H. F. ; Yan J. W. ; Xu G. ; Zhao H. W.
	2014
关键词	Autumn phenology End date of the vegetation growing season (EGS) Spatial-temporal variation AVHRR LAI Qinghai-Tibetan Plateau time-series spring phenology mann-kendall temperature variability dynamics patterns europe trends tests
英文摘要	The spatial and temporal variations in the end date of the vegetation growing season (EGS) and their relationships with climate factors across the Qinghai-Tibetan Plateau yet have not been well researched. In this study, we used the rate of the change in the curvature of the S-curve function which integrated a logistic function and an asymmetric Gaussian function and showed a better performance for fitting the LAI (leaf area index) data to extract the EGS from a long-term time series of AVHRR (advanced very high resolution radiometer) LAI data. The spatial distribution pattern of the EGS averaged from 1982 to 2011 presented a gradual decrease from the southeast to northwest plateau. The various vegetation types showed different phenological EGS timing. The EGS occurred earlier with increasing altitude (slope = -3 day km(-1), p < 0.001). Throughout the entire Qinghai-Tibetan Plateau, the monthly air temperature and precipitation were positively correlated with the EGS, whereas the monthly sunshine duration showed a negative correlation. At the regional scale, a less pronounced increasing EGS trend (shifting about 1 day over 24 years, p = 0.084) was observed during the entire study period. By analyzing the trend turning points, we found that the EGS occurred later during 1982-1994 (slope = 0.155 day yr(-1), p = 0.045) and 1999-2011 (slope = 0.096 day yr(-1), p = 0.3), but occurred earlier during 1994-1999 (slope = -0.373 day yr(-1),p = 0.049). During 1982-2011, the annual changes of EGS negatively correlated with precipitation (p < 0.1) in June, but positively with precipitation (p < 0.1) in August. As the same time, the annual changes of EGS positively correlated with sunshine duration (p < 0.1) in June, yet negatively with sunshine duration (p < 0.1) in August. During 1982-1994, the annual changes of EGS positively correlated with air temperature (p < 0.01) and negatively with precipitation (p < 0.1) in June. During 1994-1999, the annual changes of EGS only negatively correlated with air temperature (p < 0.05)in August. During 1999-2011, the annual changes of EGS only negatively correlated with sunshine duration (p < 0.1) in August. (C) 2014 Elsevier B.V. All rights reserved.
出处	Agricultural and Forest Meteorology
卷	189
页	81-90
收录类别	SCI
语种	英语
ISSN号	0168-1923
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/29957]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Che M. L.,Chen B. Z.,Innes J. L.,et al. Spatial and temporal variations in the end date of the vegetation growing season throughout the Qinghai-Tibetan Plateau from 1982 to 2011. 2014.

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