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DOI	10.1007/s12374-015-0536-4
	Evidences and magnitude of nighttime transpiration derived from Populus euphratica in the extreme arid region of China
	Yu, Tengfei; Feng, Qi; Si, Jianhua; Zhang, Xiaoyou; Alec, Downey; Zhao, Chunyan
发表日期	2016
ISSN	1226-9239
EISSN	1867-0725
卷号	59 期号:6
英文摘要	Extensive research has found that nighttime transpiration (E (n)) is positively correlated to the vapour pressure deficit (VPD), that suggested E (n) was highest during the night under high temperatures and low humidity along with high soil water availability, typically for the riparian forest in the extreme arid region of China. This study used the heat ratio method to measure sap velocity (V (s)) for mature and saplings Populus euphratica Oliv., and then E (n) was conservatively calculated as total nocturnal sap flow (F (s), the product of V (s) and sapwood area A (s)) between 01:00 to 06:00. A gas exchange system was used to measure the leaf transpiration rate (T (r)) and stomatal conductance (g (s)) of saplings. For mature trees, nighttime V (s) was extensive and logarithmic correlated to VPD (similar to daytime). For saplings, g (s) and T (r) was extensive in different months, and also a strong logarithmic relationship was found between V (s) and VPD for both daytime and nighttime periods. Both of stem sap flow and leaf gas exchange suggusted the occurrence of E (n), whether mature or sapling trees. E (n) contribution to daily transpiration (E (d)) was high just as expected for P. euphratica, which was confirmed by proportional E (n) to E (d) (E (n)/E (d)) means taken in 2012 (24.99%) and 2013 (34.08%). Compared to mature trees, E (n)/E (d) of saplings in 2013 was lower with means of 12.06%, that supported further by the shorter duration times and less T (r,n) (16.64%) and g (s,n) (26.45%) of leaf, suggesting that E (n) magnitude is associated to individual the tree size, that effect to stored water of individual trees, although this hypothesis requires further research.
关键词	Nighttime transpiration Populus euphratica Sap flow Stomatal conductance
学科领域	Plant Sciences
语种	英语
WOS研究方向	Plant Sciences
来源期刊	JOURNAL OF PLANT BIOLOGY
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/111872
作者单位	Chinese Acad Sci, Key Lab Ecohydrol Inland River Basin, Lanzhou 730000, Peoples R China
推荐引用方式 GB/T 7714	Yu, Tengfei,Feng, Qi,Si, Jianhua,et al. Evidences and magnitude of nighttime transpiration derived from Populus euphratica in the extreme arid region of China[J]. 中国科学院西北生态环境资源研究院,2016,59(6).
APA	Yu, Tengfei,Feng, Qi,Si, Jianhua,Zhang, Xiaoyou,Alec, Downey,&Zhao, Chunyan.(2016).Evidences and magnitude of nighttime transpiration derived from Populus euphratica in the extreme arid region of China.JOURNAL OF PLANT BIOLOGY,59(6).
MLA	Yu, Tengfei,et al."Evidences and magnitude of nighttime transpiration derived from Populus euphratica in the extreme arid region of China".JOURNAL OF PLANT BIOLOGY 59.6(2016).