DOI: 10.5194/hess-20-487-2016
Scopus记录号: 2-s2.0-84957033033
论文题名: Sensitivity of water stress in a two-layered sandy grassland soil to variations in groundwater depth and soil hydraulic parameters
作者: Rezaei M ; , Seuntjens P ; , Joris I ; , Boënne W ; , Van Hoey S ; , Campling P ; , Cornelis W ; M
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2016
卷: 20, 期: 1 起始页码: 487
结束页码: 503
语种: 英语
Scopus关键词: Agriculture
; Boundary conditions
; Climate models
; Crops
; Groundwater
; Groundwater resources
; Hydraulic conductivity
; Hydrology
; Irrigation
; Moisture control
; Soil moisture
; Soils
; Water content
; Yield stress
; Hydraulic parameters
; Lower boundary conditions
; Optimal irrigation scheduling
; Parameter optimization
; Precision Agriculture
; Saturated hydraulic conductivity
; Soil hydraulic parameters
; Soil moisture monitoring
; Sensitivity analysis
; boundary condition
; crop yield
; grassland soil
; hydraulic conductivity
; hydrological modeling
; irrigation system
; optimization
; precision agriculture
; sensitivity analysis
; soil water
; water depth
; water stress
英文摘要: Monitoring and modelling tools may improve irrigation strategies in precision agriculture. We used non-invasive soil moisture monitoring, a crop growth and a soil hydrological model to predict soil water content fluctuations and crop yield in a heterogeneous sandy grassland soil under supplementary irrigation. The sensitivity of the soil hydrological model to hydraulic parameters, water stress, crop yield and lower boundary conditions was assessed after integrating models. Free drainage and incremental constant head conditions were implemented in a lower boundary sensitivity analysis. A time-dependent sensitivity analysis of the hydraulic parameters showed that changes in soil water content are mainly affected by the soil saturated hydraulic conductivity Ks and the Mualem-van Genuchten retention curve shape parameters n and α. Results further showed that different parameter optimization strategies (two-, three-, four- or six-parameter optimizations) did not affect the calculated water stress and water content as significantly as does the bottom boundary. In this case, a two-parameter scenario, where Ks was optimized for each layer under the condition of a constant groundwater depth at 135-140 cm, performed best. A larger yield reduction, and a larger number and longer duration of stress conditions occurred in the free drainage condition as compared to constant boundary conditions. Numerical results showed that optimal irrigation scheduling using the aforementioned water stress calculations can save up to 12-22 % irrigation water as compared to the current irrigation regime. This resulted in a yield increase of 4.5-6.5 %, simulated by the crop growth model. © Author(s) 2016. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78925
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Soil Management, Ghent University, Coupure Links 653, Ghent, Belgium; Unit Environmental Modelling, Flemish Institute for Technological Research (VITO NV), Boeretang 200, Mol, Belgium; Department of Bioscience Engineering, University of Antwerp, Groenenborgerlaan 171, Antwerp, Belgium; Department of Mathematical Modelling, Statistics and Bioinformatics, Ghent University, Coupure Links 653, Ghent, Belgium
Recommended Citation:
Rezaei M,, Seuntjens P,, Joris I,et al. Sensitivity of water stress in a two-layered sandy grassland soil to variations in groundwater depth and soil hydraulic parameters[J]. Hydrology and Earth System Sciences,2016-01-01,20(1)