气候变化领域集成服务门户(CCPortal): Comparative study of daytime and nighttime sap flow of Populus euphratica

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DOI	10.1007/s10725-017-0263-6
	Comparative study of daytime and nighttime sap flow of Populus euphratica
	Zhao, Chun Yan; Si, Jian Hua; Feng, Qi; Yu, Teng Fei; Li, Pei Du
发表日期	2017
ISSN	0167-6903
EISSN	1573-5087
卷号	82 期号:2
英文摘要	In order to quantify and characterize the variance in desert riparian forest tree sap flow, we measured the sap flow from Populus euphratica and compared the daytime and nighttime patterns and responses to environmental variables. Results showed that daytime sap flow velocity was significantly higher (P < 0.05). Daytime and nighttime mean sap flow velocities were 7.65 and 4.01 cm h(-1) in spring, 21.38 and 9.60 cm h(-1) in summer, and 11.04 and 5.21 cm h(-1) in autumn, respectively. Moreover, results indicated that the stoma remained partially open (15% minimum) throughout the night, providing sufficient evidence for the existance of nighttime transpiration. The vapor pressure deficit (VPD), stomatal conductance (Cs), photosynthetically active radiation (PAR), air temperature (Ta), wind speed (WS), and soil moisture (theta) all had significant positive effects on P. euphratica sap flow velocity (P < 0.05). Furthermore, the relationship between daytime sap flow velocity and VPD showed clockwise hysteresis, while the relationship between nighttime sap flow velocity and VPD showed counter-clockwise hysteresis. It was evident that PAR and VPD were the key factors impacting daytime sap flow velocity, while Cs and theta were the key factors impacting nighttime sap flow velocity. Furthermore, linear regression results showed that daytime sap flow had a significant positive effect on nighttime sap flow throughout the growing season (P < 0.05).
关键词	Sap flow Heat ratio method Principle component analysis Populus euphratica
学科领域	Plant Sciences
语种	英语
WOS研究方向	Plant Sciences
来源期刊	PLANT GROWTH REGULATION
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/111926
作者单位	Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Lanzhou 730000, Peoples R China
推荐引用方式 GB/T 7714	Zhao, Chun Yan,Si, Jian Hua,Feng, Qi,et al. Comparative study of daytime and nighttime sap flow of Populus euphratica[J]. 中国科学院西北生态环境资源研究院,2017,82(2).
APA	Zhao, Chun Yan,Si, Jian Hua,Feng, Qi,Yu, Teng Fei,&Li, Pei Du.(2017).Comparative study of daytime and nighttime sap flow of Populus euphratica.PLANT GROWTH REGULATION,82(2).
MLA	Zhao, Chun Yan,et al."Comparative study of daytime and nighttime sap flow of Populus euphratica".PLANT GROWTH REGULATION 82.2(2017).