DOI: 10.1016/j.jhydrol.2020.124815
论文题名: Sap flow dynamics of xerophytic shrubs differ significantly among rainfall categories in the Loess Plateau of China
作者: Wang D. ; Gao G. ; Li J. ; Yuan C. ; Lü Y. ; Fu B.
刊名: Journal of Hydrology
ISSN: 221694
出版年: 2020
卷: 585 语种: 英语
英文关键词: Drylands
; Inter-specific variation
; Rainfall category
; Sap flow
; Xerophytic shrub
Scopus关键词: Climate change
; K-means clustering
; Landforms
; Sediments
; Soil moisture
; Dry land
; Global climate changes
; Inter-specific variation
; Loess plateau of chinas
; Meteorological factors
; Rainfall characteristics
; Sap flow
; Xerophytic shrubs
; Rain
; Caragana korshinskii
; Salix psammophila
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. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/158110
Appears in Collections: 气候变化与战略
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作者单位: State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Department of Geosciences, The University of Tulsa, Tulsa, OK 74104, United States; Institute of International Rivers and Eco-security, Yunnan University, Kunming, 650091, China
Recommended Citation:
Wang D.,Gao G.,Li J.,et al. Sap flow dynamics of xerophytic shrubs differ significantly among rainfall categories in the Loess Plateau of China[J]. Journal of Hydrology,2020-01-01,585