干旱区生态环境知识资源中心(Arid): The relative controls of temperature and soil moisture on the start of carbon flux phenology and net ecosystem production in two alpine meadows on the Qinghai-Tibetan Plateau

Arid

DOI	10.1093/jpe/rtaa007
	The relative controls of temperature and soil moisture on the start of carbon flux phenology and net ecosystem production in two alpine meadows on the Qinghai-Tibetan Plateau
	Chai, Xi; Shi, Peili; Song, Minghua; Zong, Ning; He, Yongtao; Li, Yingnian; Zhang, Xianzhou; Liu, Yanjiao
通讯作者	Chai, X
来源期刊	JOURNAL OF PLANT ECOLOGY
ISSN	1752-9921
EISSN	1752-993X
出版年	2020
卷号	13 期号:2 页码:247-255
英文摘要	Aims Variations in vegetation spring phenology are widely attributed to temperature in temperate and cold regions. However, temperature effect on phenology remains elusive in cold and arid/semiarid ecosystems because soil water condition also plays an important role in mediating phenology. Methods We used growing degree day (GDD) model and growing season index (GSI) model, coupling minimum temperature (T-min) with soil moisture (SM) to explore the influence of heat requirement and hydroclimatic interaction on the start of carbon uptake period (SCUP) and net ecosystem productivity (NEP) in two alpine meadows with different precipitation regimes on the Qinghai-Tibet Plateau (QTP). One is the water-limited alpine steppe-meadow, and the other is the temperature-limited alpine shrub-meadow. Important Findings We observed two clear patterns linking GDD and GSI to SCUP: SCUP was similarly sensitive to variations in preseason GDD and GSI in the humid alpine shrub-meadow, while SCUP was more sensitive to the variability in preseason GSI than GDD in the semiarid alpine steppe-meadow. The divergent patterns indicated a balance of the limiting climatic factors between temperature and water availability. In the humid meadow, higher temperature sensitivity of SCUP could maximize thermal benefit without drought stress, as evidenced by the stronger linear correlation coefficient (IV) and Akaike's information criterion (AIC) between observed SCUPs and those of simulated by GDD model. However, greater water sensitivity of SCUP could maximize the benefit of water in semiarid steppe-meadow, which is indicated by the stronger R' and AIC between observed SCUPs and those of simulated by GSI model. Additionally, although SCUPs were determined by GDD in the alpine shrub-meadow ecosystem, NFP was both controlled by accumulative GSI in two alpine meadows. Our study highlights the impacts of hydroclimatic interaction on spring carbon flux phenology and vegetation productivity in the humid and semiarid alpine ecosystems. The results also suggest that water, together with temperature should be included in the models of phenology and carbon budget for alpine ecosystems in semiarid regions. These findings have important implications for improving vegetation phenology models, thus advancing our understanding of the interplay between vegetation phenology, productivity and climate change in future.
英文关键词	growing degree day growing season index the start of carbon uptake period net ecosystem production alpine meadows Qinghai-Tibet Plateau
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000544726900015
WOS关键词	SPRING PHENOLOGY ; GROWING-SEASON ; INTERANNUAL VARIABILITY ; DECIDUOUS FORESTS ; BIOCLIMATIC INDEX ; KOBRESIA MEADOW ; CO2 EXCHANGE ; VEGETATION ; CLIMATE ; STEPPE
WOS类目	Plant Sciences ; Ecology ; Forestry
WOS研究方向	Plant Sciences ; Environmental Sciences & Ecology ; Forestry
来源机构	中国科学院地理科学与资源研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/324895
作者单位	[Chai, Xi; Shi, Peili; Song, Minghua; Zong, Ning; He, Yongtao; Zhang, Xianzhou] Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, 11A Datun Rd, Beijing 100101, Peoples R China; [Chai, Xi; He, Yongtao; Zhang, Xianzhou] Univ Chinese Acad Sci, Coll Resources & Environm, 80 Zhongguancun East Rd, Beijing 100190, Peoples R China; [Li, Yingnian] Chinese Acad Sci, Northwest Inst Plateau Biol, 23 Xining Rd, Xining, Qinghai, Peoples R China; [Liu, Yanjiao] Beijing Zhongnong Futong Hort Co Ltd, 17 Qinghua East Rd, Beijing 100083, Peoples R China
推荐引用方式 GB/T 7714	Chai, Xi,Shi, Peili,Song, Minghua,et al. The relative controls of temperature and soil moisture on the start of carbon flux phenology and net ecosystem production in two alpine meadows on the Qinghai-Tibetan Plateau[J]. 中国科学院地理科学与资源研究所,2020,13(2):247-255.
APA	Chai, Xi.,Shi, Peili.,Song, Minghua.,Zong, Ning.,He, Yongtao.,...&Liu, Yanjiao.(2020).The relative controls of temperature and soil moisture on the start of carbon flux phenology and net ecosystem production in two alpine meadows on the Qinghai-Tibetan Plateau.JOURNAL OF PLANT ECOLOGY,13(2),247-255.
MLA	Chai, Xi,et al."The relative controls of temperature and soil moisture on the start of carbon flux phenology and net ecosystem production in two alpine meadows on the Qinghai-Tibetan Plateau".JOURNAL OF PLANT ECOLOGY 13.2(2020):247-255.