DOI: 10.5194/hess-24-4943-2020
论文题名: Comparison of root water uptake models in simulating CO2and H2O fluxes and growth of wheat
作者: Nguyen T.H. ; Langensiepen M. ; Vanderborght J. ; Hüging H. ; Miltin Mboh C. ; Ewert F.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2020
卷: 24, 期: 10 起始页码: 4943
结束页码: 4969
语种: 英语
Scopus关键词: Crops
; Plants (botany)
; Soil moisture
; Soil surveys
; Soil testing
; Water supply
; Different treatments
; Explicit representation
; Hydraulic conductance
; Land surface models
; Root hydraulic conductance
; Soil characteristics
; Soil water balance model
; Stomatal conductance
; Climate models
; carbon dioxide
; comparative study
; growth response
; hydrological modeling
; photosynthesis
; physiological response
; stomatal conductance
; water flux
; water uptake
; water use efficiency
; wheat
英文摘要: Stomatal regulation and whole plant hydraulic signaling affect water fluxes and stress in plants. Land surface models and crop models use a coupled photosynthesis-stomatal conductance modeling approach. Those models estimate the effect of soil water stress on stomatal conductance directly from soil water content or soil hydraulic potential without explicit representation of hydraulic signals between the soil and stomata. In order to explicitly represent stomatal regulation by soil water status as a function of the hydraulic signal and its relation to the whole plant hydraulic conductance, we coupled the crop model LINTULCC2 and the root growth model SLIMROOT with Couvreur's root water uptake model (RWU) and the HILLFLOW soil water balance model. Since plant hydraulic conductance depends on the plant development, this model coupling represents a two-way coupling between growth and plant hydraulics. To evaluate the advantage of considering plant hydraulic conductance and hydraulic signaling, we compared the performance of this newly coupled model with another commonly used approach that relates root water uptake and plant stress directly to the root zone water hydraulic potential (HILLFLOW with Feddes' RWU model). Simulations were compared with gas flux measurements and crop growth data from a wheat crop grown under three water supply regimes (sheltered, rainfed, and irrigated) and two soil types (stony and silty) in western Germany in 2016. The two models showed a relatively similar performance in the simulation of dry matter, leaf area index (LAI), root growth, RWU, gross assimilation rate, and soil water content. The Feddes model predicts more stress and less growth in the silty soil than in the stony soil, which is opposite to the observed growth. The Couvreur model better represents the difference in growth between the two soils and the different treatments. The newly coupled model (HILLFLOW-Couvreur's RWU-SLIMROOT-LINTULCC2) was also able to simulate the dynamics and magnitude of whole plant hydraulic conductance over the growing season. This demonstrates the importance of two-way feedbacks between growth and root water uptake for predicting the crop response to different soil water conditions in different soils. Our results suggest that a better representation of the effects of soil characteristics on root growth is needed for reliable estimations of root hydraulic conductance and gas fluxes, particularly in heterogeneous fields. The newly coupled soil-plant model marks a promising approach but requires further testing for other scenarios regarding crops, soil, and climate. © 2020 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162571
Appears in Collections: 气候变化与战略
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作者单位: Nguyen, T.H., University of Bonn, Institute of Crop Science and Resource Conservation (INRES), Katzenburgweg 5, Bonn, 53115, Germany; Langensiepen, M., University of Bonn, Institute of Crop Science and Resource Conservation (INRES), Katzenburgweg 5, Bonn, 53115, Germany; Vanderborght, J., Agrosphere Institute of Bio- and Geosciences (IBG-3), Forschungszentrum Jülich GmbH, Jülich, 52428, Germany; Hüging, H., University of Bonn, Institute of Crop Science and Resource Conservation (INRES), Katzenburgweg 5, Bonn, 53115, Germany; Miltin Mboh, C., BASF Digital Farming GmbH, Im Zollhafen 24, Cologne, 50678, Germany; Ewert, F., University of Bonn, Institute of Crop Science and Resource Conservation (INRES), Katzenburgweg 5, Bonn, 53115, Germany, Leibniz Centre for Agricultural Landscape Research (ZALF), Institute of Landscape Systems Analysis, Eberswalder Strasse 84, Muencheberg, 15374, Germany
Recommended Citation:
Nguyen T.H.,Langensiepen M.,Vanderborght J.,et al. Comparison of root water uptake models in simulating CO2and H2O fluxes and growth of wheat[J]. Hydrology and Earth System Sciences,2020-01-01,24(10)