干旱区生态环境知识资源中心(Arid): Biophysical control on nighttime sap flow in Salix psammophila in a semiarid shrubland ecosystem

Arid

DOI	10.1016/j.agrformet.2021.108329
	Biophysical control on nighttime sap flow in Salix psammophila in a semiarid shrubland ecosystem
	Hayat, Muhammad; Iqbal, Sundas; Zha, Tianshan; Jia, Xin; Qian, Duo; Bourque, Charles P-A; Khan, Alamgir; Tian, Yun; Bai, Yujie; Liu, Peng; Yang, Ruizhi
通讯作者	Zha, TS (corresponding author), Beijing Forestry Univ, Sch Soil & Water Conservat, Yanchi Res Stn, Beijing 100083, Peoples R China. ; Zha, TS (corresponding author), Beijing Forestry Univ, Beijing Engn Res Ctr Soil & Water Conservat, Beijing, Peoples R China.
来源期刊	AGRICULTURAL AND FOREST METEOROLOGY
ISSN	0168-1923
EISSN	1873-2240
出版年	2021
卷号	300
英文摘要	The impact of extreme desert conditions on long-term nighttime sap flow dynamics in desert-dwelling shrubs is poorly understood. Based on heat-balance measurements in a semiarid area of northwest China, we investigated the nighttime sap flow (transpiration) dynamics in Salix psammophila as affected by changes in site biophysical variables over a six-year period (2012-2017). Nocturnally, sap flow rate per leaf area (J(s)(n)) formed a positive linear relationship with air temperature (T-a), water vapor pressure deficit (VPD) and stomatal conductance (G(s)), when T-a < 17 degrees C, VPD < 1 kPa, and G(s) < 0.004 mol m(-2) s(-1), remaining unchanging or forming a negative linear relationship, when T-a, VPD and G(s) were greater than these limits. This relationship was modified by soil water content (SWC) through its effects on G(s). The multiple regression model showed that together T-a, VPD and G(s) explained 63% of the variation in J(s)(n). Seasonally, pairwise relationships between T-a and VPD and G(s) and SWC explained 76 and 70% of the variation in J(s)(n) during wet and dry years, respectively. Interannually, T-a and G(s) were able to explain a significant portion of observed variation in J(s)(n), individually explaining about 74 and 83% of that variation. Interannual control on J(s)(n) also varied with SWC, T-a and G(s) explaining 84% of the variation. The diminished sensitivity of J(s)(n) to both T-a and VPD and increased sensitivity to SWC during dry years, suggested that the shrubs had a physiological capacity to adapt to dry soil conditions. Daytime sap flow rates (J(s)(d)) were significantly greater than those at night (i.e., J(s)(n)), with an interannual mean difference of 0.15 +/- 0.04 g cm(-2) d(-1) and coefficient of variation of 27%. In addition, J(s)(n) formed a positive linear association with J(s)(d) during the growing season. Mean J(s)(n) contributed to the daily total sap flow (i.e., J(s)(n)/J(s)(n)/J(s)(24-h) x 100) by 8-14% over the six years, with an interannual mean of 11%. Our findings underscore the importance of nighttime sap flow in S. psammophila and the importance of temperature and SWC in controlling nighttime water losses through transpiration. It is suggested that the proportion of nighttime sap flow could increase during plant acclimatization in response to increasing temperature and water shortages with future climate change.
英文关键词	Biophysical variables Heat balance Nighttime sap flow Salix psammophila Stomatal conductance Water vapor pressure deficit
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000635674500018
WOS关键词	NOCTURNAL STOMATAL CONDUCTANCE ; SPECIES ARTEMISIA-ORDOSICA ; HOLM OAK FOREST ; POPULUS-EUPHRATICA ; WATER-LOSS ; INTERSPECIFIC VARIATION ; ENVIRONMENTAL CONTROLS ; DESERT REGION ; GAS-EXCHANGE ; CO2 EXCHANGE
WOS类目	Agronomy ; Forestry ; Meteorology & Atmospheric Sciences
WOS研究方向	Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
来源机构	北京大学 ; 北京林业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/349316
作者单位	[Hayat, Muhammad; Iqbal, Sundas; Zha, Tianshan; Jia, Xin; Bourque, Charles P-A; Khan, Alamgir; Tian, Yun; Bai, Yujie; Liu, Peng; Yang, Ruizhi] Beijing Forestry Univ, Sch Soil & Water Conservat, Yanchi Res Stn, Beijing 100083, Peoples R China; [Hayat, Muhammad; Iqbal, Sundas; Zha, Tianshan; Jia, Xin; Khan, Alamgir; Tian, Yun; Bai, Yujie; Liu, Peng; Yang, Ruizhi] Beijing Forestry Univ, Beijing Engn Res Ctr Soil & Water Conservat, Beijing, Peoples R China; [Qian, Duo] Beijing Vocat Coll Agr, Beijing 102442, Peoples R China; [Bourque, Charles P-A] Univ New Brunswick, Fac Forestry & Environm Management, 28 Dineen Dr, Fredericton, NB E3B 5A3, Canada; [Hayat, Muhammad] Peking Univ, Sch Environm & Energy, Shenzhen Grad Sch, Shenzhen 518055, Peoples R China
推荐引用方式 GB/T 7714	Hayat, Muhammad,Iqbal, Sundas,Zha, Tianshan,et al. Biophysical control on nighttime sap flow in Salix psammophila in a semiarid shrubland ecosystem[J]. 北京大学, 北京林业大学,2021,300.
APA	Hayat, Muhammad.,Iqbal, Sundas.,Zha, Tianshan.,Jia, Xin.,Qian, Duo.,...&Yang, Ruizhi.(2021).Biophysical control on nighttime sap flow in Salix psammophila in a semiarid shrubland ecosystem.AGRICULTURAL AND FOREST METEOROLOGY,300.
MLA	Hayat, Muhammad,et al."Biophysical control on nighttime sap flow in Salix psammophila in a semiarid shrubland ecosystem".AGRICULTURAL AND FOREST METEOROLOGY 300(2021).