DOI: 10.5194/hess-24-4675-2020
论文题名: Throughfall isotopic composition in relation to drop size at the intra-event scale in a Mediterranean Scots pine stand
作者: Pinos J. ; Latron J. ; Nanko K. ; Levia D.F. ; Llorens P.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2020
卷: 24, 期: 9 起始页码: 4675
结束页码: 4690
语种: 英语
Scopus关键词: Drops
; Evaporation
; Isotopes
; Kinetic energy
; Kinetics
; Rain
; Cumulative rainfall
; Droplet evaporation
; Future applications
; Isotopic composition
; Isotopic enrichment
; Isotopic exchange
; Meteorological variables
; Vapour pressure deficits
; Forestry
; coniferous tree
; forest floor
; isotopic composition
; Mediterranean environment
; raindrop
; soil surface
; throughfall
; vapor pressure
; Spain
; Pinus sylvestris
英文摘要: The major fraction of water reaching the forest floor is throughfall, which consists of free throughfall, splash throughfall and canopy drip. Research has shown that forest canopies modify the isotopic composition of throughfall by means of evaporation, isotopic exchange, canopy selection and mixing of rainfall waters. However, the effects of these factors in relation to throughfall isotopic composition and the throughfall drop size reaching the soil surface are unclear. Based on research in a mountainous Scots pine stand in northeastern Spain, this study sought to fill this knowledge gap by examining the isotopic composition of throughfall in relation to throughfall drop size. In the experimental stand, throughfall consisted on average of 65 % canopy drip, 19 % free throughfall and 16 % splash throughfall. The dynamics of the isotopic composition of throughfall and rainfall showed complex behaviour throughout events. The isotopic shift showed no direct relationship with meteorological variables, number of drops, drop velocities, throughfall and rainfall amount, or raindrop kinetic energy. However, the experiment did reveal that the isotopic shift was higher at the beginning of an event, decreasing as cumulative rainfall increased, and that it also increased when the median volume drop size of throughfall (D50_TF) approached or was lower than the median volume drop size of rainfall (D50_RF). This finding indicates that the major contribution of splash throughfall at the initial phase of rain events matched the highest vapour pressure deficit (VPD) and, at the same time, corresponded to higher isotopic enrichment, which implies that splash droplet evaporation occurred. Future applications of our approach will improve understanding of how throughfall isotopic composition may vary with drop type and size during rainfall events across a range of forest types. © 2020 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162586
Appears in Collections: 气候变化与战略
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作者单位: Pinos, J., Surface Hydrology and Erosion Group, Institute of Environmental Assessment and Water Research, IDAEA-CSIC, Barcelona, Spain; Latron, J., Surface Hydrology and Erosion Group, Institute of Environmental Assessment and Water Research, IDAEA-CSIC, Barcelona, Spain; Nanko, K., Department of Disaster Prevention Meteorology and Hydrology, Forestry and Forest Products Research Institute, Tsukuba, Japan; Levia, D.F., Departments of Geographyg and Spatial Sciences and Plantg and Soil Sciences, University of Delaware, Newark, DE, United States; Llorens, P., Surface Hydrology and Erosion Group, Institute of Environmental Assessment and Water Research, IDAEA-CSIC, Barcelona, Spain
Recommended Citation:
Pinos J.,Latron J.,Nanko K.,et al. Throughfall isotopic composition in relation to drop size at the intra-event scale in a Mediterranean Scots pine stand[J]. Hydrology and Earth System Sciences,2020-01-01,24(9)