DOI: 10.5194/hess-23-3457-2019
论文题名: Modeling boreal forest evapotranspiration and water balance at stand and catchment scales: a spatial approach
作者: Launiainen S. ; Guan M. ; Salmivaara A. ; Kieloaho A.-J.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2019
卷: 23, 期: 8 起始页码: 3457
结束页码: 3480
语种: 英语
Scopus关键词: Catchments
; Climate change
; Evapotranspiration
; Forecasting
; Geographic information systems
; Land use
; Open Data
; Runoff
; Soil moisture
; Topography
; Vegetation
; Boreal coniferous forests
; Catchment water balance
; Discharge measurements
; Eddy covariance technique
; Soil characteristics
; Spatially distributed modeling
; Stomatal conductance
; Vegetation properties
; Forestry
; boreal forest
; catchment
; climate change
; coniferous forest
; discharge
; evapotranspiration
; forest management
; GIS
; headwater
; heterogeneity
; leaf area index
; parameterization
; soil moisture
; stomatal conductance
; water budget
; Coniferophyta
英文摘要: Vegetation is known to have strong influence on evapotranspiration (ET), a major component of terrestrial water balance. Yet hydrological models often describe ET by methods unable to include the variability of vegetation characteristics in their predictions. To take advantage of the increasing availability of high-resolution open GIS data on land use, vegetation and soil characteristics in the boreal zone, a modular, spatially distributed model for predicting ET and other hydrological processes from grid cell to catchment level is presented and validated. An improved approach to upscale stomatal conductance to canopy scale using information on plant type (conifer/deciduous) and stand leafarea index (LAI) is proposed by coupling a common leafscale stomatal conductance model with a simple canopy radiation transfer scheme. Further, a generic parametrization for vegetation-related hydrological processes for Nordic boreal forests is derived based on literature and data from a boreal FluxNet site. With the generic parametrization, the model was shown to reproduce daily ET measured using an eddycovariance technique well at 10 conifer-dominated Nordic forests whose LAI ranged from 0.2 to 6.8m2 m-2. Topography, soil and vegetation properties at 21 small boreal headwater catchments in Finland were derived from open GIS data at 16m×16m grid size to upscale water balance from stand to catchment level. The predictions of annual ET and specific discharge were successful in all catchments, located from 60 to 68° N, and daily discharge was also reasonably well predicted by calibrating only one parameter against discharge measurements. The role of vegetation heterogeneity in soil moisture and partitioning of ET was demonstrated. The proposed framework can support, for example, forest trafficability forecasting and predicting impacts of climate change and forest management on stand and catchment water balance. With appropriate parametrization it can be generalized outside the boreal coniferous forests. © Author(s) 2019. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162912
Appears in Collections: 气候变化与战略
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作者单位: Launiainen, S., Nature Resources Institute Finland, Latokartanonkaari 9, Helsinki, 00790, Finland; Guan, M., Nature Resources Institute Finland, Latokartanonkaari 9, Helsinki, 00790, Finland, Department of Civil Engineering, University of Hong Kong, HKSAR, Hong Kong, Hong Kong; Salmivaara, A., Nature Resources Institute Finland, Latokartanonkaari 9, Helsinki, 00790, Finland; Kieloaho, A.-J., Nature Resources Institute Finland, Latokartanonkaari 9, Helsinki, 00790, Finland
Recommended Citation:
Launiainen S.,Guan M.,Salmivaara A.,et al. Modeling boreal forest evapotranspiration and water balance at stand and catchment scales: a spatial approach[J]. Hydrology and Earth System Sciences,2019-01-01,23(8)