Sap flow dynamics of xerophytic shrubs differ significantly among rainfall categories in the Loess Plateau of China

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 城市与区域生态国家重点实验室

	Sap flow dynamics of xerophytic shrubs differ significantly among rainfall categories in the Loess Plateau of China
	Wang, Di; Gao, Guangyao; Li, Junran; Yuan, Chuan; Lu, Yihe; Fu, Bojie
刊名	JOURNAL OF HYDROLOGY
	2020-06
卷号	585 页码:1-9
关键词	Sap flow Rainfall category Inter-specific variation Xerophytic shrub Drylands
ISSN号	0022-1694
英文摘要	Global climate change is likely to change the timing, frequency and magnitude of precipitation events, studying the response of sap flow (SF) of plants to rainfall events is thus important for understanding the response of ecosystems to global climate change. Here, we conducted a comprehensive study on the SF, rainfall events, meteorological factors and soil water content (SWC) for two typical xerophytic shrub stands (Caragana korshinskii and Salix psammophila) on the Loess Plateau of China for two rainy seasons (June-September) in 2015 and 2016. The rainfall events were classified into three rainfall categories using the K-means clustering based on the rainfall amount (RA), rainfall duration (RD) and rainfall intensity (RI) (category I: lowest mean RA, RD and RI, category II: moderate mean RA, RI and highest mean RD and category III: highest mean RA, RI and moderate mean RD). The results showed that the response of SF at both C. korshinskii and S. psammophila stands to rainfall events differed within the three categories. The occurrence of rainfall events significantly decreased daily SF of C. korshinskii in three rainfall categories, whereas the daily SF of S. psammophila is more strongly influenced by rainfall category II. Maximum decreases in daily SF between the pre-rainfall and the rainfall weather condition of the two stands both occurred in rainfall category II. Daily rainfall SF at both stands was strongly correlated with daily SR, RH and VPD, regardless of the rainfall categories. Diurnal variation of hourly SF at both stands also differed among the days with similar RA and RD in the same rainfall category. It can be inferred that SF of C. korshinskii is more susceptible to rainfall events than S. psammophila. Rainfall characteristics (RA, RD and RI) and rainfall distribution should be fully considered when assessing the response of SF of shrubs to rainfall events.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/44440]
专题	生态环境研究中心_城市与区域生态国家重点实验室
推荐引用方式 GB/T 7714	Wang, Di,Gao, Guangyao,Li, Junran,et al. Sap flow dynamics of xerophytic shrubs differ significantly among rainfall categories in the Loess Plateau of China[J]. JOURNAL OF HYDROLOGY,2020,585:1-9.
APA	Wang, Di,Gao, Guangyao,Li, Junran,Yuan, Chuan,Lu, Yihe,&Fu, Bojie.(2020).Sap flow dynamics of xerophytic shrubs differ significantly among rainfall categories in the Loess Plateau of China.JOURNAL OF HYDROLOGY,585,1-9.
MLA	Wang, Di,et al."Sap flow dynamics of xerophytic shrubs differ significantly among rainfall categories in the Loess Plateau of China".JOURNAL OF HYDROLOGY 585(2020):1-9.