DOI: 10.5194/hess-18-4979-2014
Scopus记录号: 2-s2.0-84916638466
论文题名: Evaluation of root water uptake in the ISBA-A-gs land surface model using agricultural yield statistics over France
作者: Canal N ; , Calvet J ; -C ; , Decharme B ; , Carrer D ; , Lafont S ; , Pigeon G
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2014
卷: 18, 期: 12 起始页码: 4979
结束页码: 4999
语种: 英语
Scopus关键词: Agriculture
; Carbon dioxide
; Rain
; Reservoirs (water)
; Soils
; Surface measurement
; Time series
; Vegetation
; Above ground biomass
; Agricultural yields
; Interannual variability
; Land surface modeling
; Land surface models
; Permanent grassland
; Satellite vegetation
; Sources of uncertainty
; Computer simulation
; aboveground biomass
; agricultural production
; annual variation
; dry matter
; land surface
; plant water relations
; rhizosphere
; simulation
; soil water
; water uptake
; France
英文摘要: The simulation of root water uptake in land surface models is affected by large uncertainties. The difficulty in mapping soil depth and in describing the capacity of plants to develop a rooting system is a major obstacle to the simulation of the terrestrial water cycle and to the representation of the impacts of drought. In this study, long time series of agricultural statistics are used to evaluate and constrain root water uptake models. The inter-annual variability of cereal grain yield and permanent grassland dry matter yield is simulated over France by the Interactions between Soil, Biosphere and Atmosphere, CO2-reactive (ISBA-A-gs) generic land surface model (LSM). The two soil profile schemes available in the model are used to simulate the above-ground biomass (Bag) of cereals and grasslands: a two-layer force-restore (FR-2L) bulk reservoir model and a multi-layer diffusion (DIF) model. The DIF model is implemented with or without deep soil layers below the root zone. The evaluation of the various root water uptake models is achieved by using the French agricultural statistics of Agreste over the 1994-2010 period at 45 cropland and 48 grassland départements, for a range of rooting depths. The number of départements where the simulated annual maximum Bag presents a significant correlation with the yield observations is used as a metric to benchmark the root water uptake models. Significant correlations (p value < 0.01) are found for up to 29 and 77% of the départements for cereals and grasslands, respectively. A rather neutral impact of the most refined versions of the model is found with respect to the simplified soil hydrology scheme. This shows that efforts should be made in future studies to reduce other sources of uncertainty, e.g. by using a more detailed soil and root density profile description together with satellite vegetation products. It is found that modelling additional subroot-zone base flow soil layers does not improve (and may even degrade) the representation of the inter-annual variability of the vegetation above-ground biomass. These results are particularly robust for grasslands, as calibrated simulations are able to represent the extreme 2003 and 2007 years corresponding to unfavourable and favourable fodder production, respectively. © Author(s) 2014. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78051
Appears in Collections: 气候变化事实与影响
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作者单位: CNRM-GAME - UMR3589, Météo-France, CNRS, Toulouse, France; ARVALIS Institut du Végétal, Service Systèmes d'Information et Méthodologies, Boigneville, France; Météo-France, Division Agrométéorologie, Toulouse, France; ISPA - UMR1391, INRA, Villenave d'Ornon, France
Recommended Citation:
Canal N,, Calvet J,-C,et al. Evaluation of root water uptake in the ISBA-A-gs land surface model using agricultural yield statistics over France[J]. Hydrology and Earth System Sciences,2014-01-01,18(12)