气候变化领域集成服务门户(CCPortal): Little change in heat requirement for vegetation green-up on the Tibetan Plateau over the warming period of 1998-2012

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DOI	10.1016/j.agrformet.2016.10.021
	Little change in heat requirement for vegetation green-up on the Tibetan Plateau over the warming period of 1998-2012
	Cong, Nan; Shen, Miaogen; Piao, Shilong; Chen, Xiaoqiu; An, Shuai; Yang, Wei; Fu, Yongshuo H.; Meng, Fandong; Wang, Tao
通讯作者	Shen, MG (通讯作者)
发表日期	2017
ISSN	0168-1923
EISSN	1873-2240
起始页码	650
结束页码	658
卷号	232
英文摘要	We investigated spatial and temporal variations in the accumulated growing degree-days (AGDD) requirement for spring vegetation green-up onset on the Tibetan Plateau (TP) during the rapid warming period of 1998-2012, which is essential for understanding and modeling the spring vegetation phenological responses to climate change. Annual green-up date was determined by using a satellite-derived normalized difference vegetation index. The annual AGDD requirement was then determined as the sum of daily mean air temperatures above 0 degrees C over the dormancy period. Linear regression between the AGDD requirement and year was used to determine its temporal trend. Partial correlation analysis was used to assess factors controlling inter-annual variations in the AGDD requirement. We found the AGDD requirement was significantly different for different vegetation types and showed large spatial variations ranging from a few degrees C-days in cold and wet areas to more than 1000 degrees C-days in warm and dry areas of the TP. Despite the rapid warming and subsequent earlier green-up date, the AGDD requirement did not increase significantly over the period 1998-2012. Interestingly, we found that the inter-annual variations in AGDD requirement were extensively driven by the number of chilling days, while precipitation sum and insolation affected the AGDD requirement in limited areas. Although the winter warming reduced chilling accumulation on the TP, the AGDD requirement for vegetation green-up onset did not necessarily increase over 1998-2012, being insensitive to decline in the chilling accumulation. This suggested that the chilling requirement to break vegetation dormancy might be still fulfilled. In other words, the winter warming might not substantially affect the vegetation green-up process, since the reduction in chilling accumulation may not affect the dormancy break. However, the negative temporal correlation between the AGDD requirement and number of chilling days indicates that continued future warming may lead to a deficiency in chilling and thus an increase in AGDD requirement. (C) 2016 Elsevier B.V. All rights reserved.
关键词	THERMAL GROWING-SEASON SPRING PHENOLOGY BUD BURST CLIMATE TEMPERATURE BUDBURST MODELS CARBON SENSITIVITY RESPONSES
英文关键词	Alpine grassland; Chilling requirement; Climate change; Heat requirement; Spring phenology; Tibetan Plateau
语种	英语
WOS研究方向	Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
WOS类目	Agronomy ; Forestry ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000389089800053
来源期刊	AGRICULTURAL AND FOREST METEOROLOGY
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/259039
推荐引用方式 GB/T 7714	Cong, Nan,Shen, Miaogen,Piao, Shilong,et al. Little change in heat requirement for vegetation green-up on the Tibetan Plateau over the warming period of 1998-2012[J]. 中国科学院青藏高原研究所,2017,232.
APA	Cong, Nan.,Shen, Miaogen.,Piao, Shilong.,Chen, Xiaoqiu.,An, Shuai.,...&Wang, Tao.(2017).Little change in heat requirement for vegetation green-up on the Tibetan Plateau over the warming period of 1998-2012.AGRICULTURAL AND FOREST METEOROLOGY,232.
MLA	Cong, Nan,et al."Little change in heat requirement for vegetation green-up on the Tibetan Plateau over the warming period of 1998-2012".AGRICULTURAL AND FOREST METEOROLOGY 232(2017).