干旱区生态环境知识资源中心(Arid): Responses of nighttime sap flow to atmospheric and soil dryness and its potential roles for shrubs on the Loess Plateau of China

Arid

	Responses of nighttime sap flow to atmospheric and soil dryness and its potential roles for shrubs on the Loess Plateau of China
	Fang Weiwei; Lu Nan; Zhang Yu; Jiao Lei; Fu Bojie
来源期刊	Journal of Plant Ecology
ISSN	1752-9921
出版年	2018
卷号	11 期号:5 页码:717-729
英文摘要	Aims Nocturnal sap flow (E_(night)) has been observed in a variety of plant species and environmental conditions. In water-limited environments, E_(night) is important in the regulation of plant waters physiology. This study was designed to evaluate the way in which E_(night) (defined as sap flow from 20:30 to 06:00) responded to changes in the atmospheric vapor pressure deficit (VPD) and the soil water content (SWC), and explored its potential physiological significance for different plant species in a semi-arid area. Methods We selected three shrub species: Vitex negundo L. (VN), Hippophae rhamnoides L. (HR) and Spiraea pubescens Turcz (SP) in the semi-arid Loess Plateau of China. The plots of the three communities dominated by each of three species were on the same hill slope. Half-hourly sap flow density was measured in six to seven sample stems for each species during the main growing season (June to August 2015). VPD, SWC, leaf water potential (Psi_(leaf)) and stomatal conductance (Gs) were measured at the same time. Regression analyses were conducted to determine the relationships between E_(night), Eday, E_(night)/Edaily, VPD and SWC at halfhourly and daily time scales, as well as between E_(night), Eday and Psi_(leaf). Important Findings The mean values of E_(night) and Eday were higher, but E_(night)/Edaily values were lower for VN compared to HR and SP. The responses of sap flow density to VPD and SWC varied at different temporal scales. VPD was the dominant factor that affected E_(night) and Eday at the half-hourly scale for all three species. In contrast, SWC was the key factor that influenced Eday at the daily time scale. The values of Eday and E_(night)/Edaily correlated negatively with SWC because the effect of SWC was stronger on Eday than on E_(night). Although the low fraction of E_(night)/Edaily (4%-7%) may indicate a minor shortterm effect of E_(night) on the standing water balance, E_(night) had ecophysiologically significance to the plants. The discrepancy in Psi_(leaf) between sunset and the following days predawn (DeltaPsi) indicated that stem refilling occurred during this period. SP had the higher fraction of recharge water among the three species, as it had the relatively higher value of DeltaPsi/E_(night). E_(night) had positive relationship with predawn Gs. The increased Gs facilitated rapid onset of photosynthesis in the early morning. In addition, the positive correlation between E_(night) and Eday from 06:00 to 10:30 suggested that E_(night) was beneficial for transpiration in the following morning. The responses of E_(night) to VPD and SWC indicated differences in plant adaptation to drought stress, which provides important information for our understanding of the reactions to climate changes among species in semi-arid areas.
英文关键词	nocturnal sap flow stem refilling stomatal conductance leaf water potential Loess Plateau
类型	Article
语种	英语
开放获取类型	Bronze
收录类别	CSCD
WOS研究方向	Life Sciences & Biomedicine - Other Topics
CSCD记录号	CSCD:6343265
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/336016
作者单位	Fang Weiwei, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences;;University of Chinese Academy of Sciences, State Key Laboratory of Urban and Regional Ecology;;, ;;, Beijing;;Beijing 100085;;100049.; Lu Nan, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences;;University of Chinese Academy of Sciences, State Key Laboratory of Urban and Regional Ecology;;, ;;, Beijing;;Beijing 100085;;100049.; Fu Bojie, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences;;University of Chinese Academy of Sciences, State Key Laboratory of Urban and Regional Ecology;;, ;;, Beijing;;Beijing 100085;;100049.; Zhang Yu, School of Natural Resources, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China.; Jiao Lei, College of Tourism and Environment, Shaanxi Normal University, Shaanxi 710119, China.
推荐引用方式 GB/T 7714	Fang Weiwei,Lu Nan,Zhang Yu,et al. Responses of nighttime sap flow to atmospheric and soil dryness and its potential roles for shrubs on the Loess Plateau of China[J],2018,11(5):717-729.
APA	Fang Weiwei,Lu Nan,Zhang Yu,Jiao Lei,&Fu Bojie.(2018).Responses of nighttime sap flow to atmospheric and soil dryness and its potential roles for shrubs on the Loess Plateau of China.Journal of Plant Ecology,11(5),717-729.
MLA	Fang Weiwei,et al."Responses of nighttime sap flow to atmospheric and soil dryness and its potential roles for shrubs on the Loess Plateau of China".Journal of Plant Ecology 11.5(2018):717-729.