气候变化领域集成服务门户(CCPortal): Root growth; water uptake; and sap flow of winter wheat in response to different soil water conditions

CCPortal

DOI	10.5194/hess-22-2449-2018
	Root growth; water uptake; and sap flow of winter wheat in response to different soil water conditions
	Cai G.; Vanderborght J.; Langensiepen M.; Schnepf A.; Hüging H.; Vereecken H.
发表日期	2018
ISSN	1027-5606
起始页码	2449
结束页码	2470
卷号	22 期号:4
英文摘要	How much water can be taken up by roots and how this depends on the root and water distributions in the root zone are important questions that need to be answered to describe water fluxes in the soil-plant-atmosphere system. Physically based root water uptake (RWU) models that relate RWU to transpiration, root density, and water potential distributions have been developed but used or tested far less. This study aims at evaluating the simulated RWU of winter wheat using the empirical Feddes-Jarvis (FJ) model and the physically based Couvreur (C) model for different soil water conditions and soil textures compared to sap flow measurements. Soil water content (SWC), water potential, and root development were monitored noninvasively at six soil depths in two rhizotron facilities that were constructed in two soil textures: stony vs. silty, with each of three water treatments: sheltered, rainfed, and irrigated. Soil and root parameters of the two models were derived from inverse modeling and simulated RWU was compared with sap flow measurements for validation. The different soil types and water treatments resulted in different crop biomass, root densities, and root distributions with depth. The two models simulated the lowest RWU in the sheltered plot of the stony soil where RWU was also lower than the potential RWU. In the silty soil, simulated RWU was equal to the potential uptake for all treatments. The variation of simulated RWU among the different plots agreed well with measured sap flow but the C model predicted the ratios of the transpiration fluxes in the two soil types slightly better than the FJ model. The root hydraulic parameters of the C model could be constrained by the field data but not the water stress parameters of the FJ model. This was attributed to differences in root densities between the different soils and treatments which are accounted for by the C model, whereas the FJ model only considers normalized root densities. The impact of differences in root density on RWU could be accounted for directly by the physically based RWU model but not by empirical models that use normalized root density functions. © Author(s) 2018.
语种	英语
scopus关键词	Crops; Flow measurement; Forestry; Inverse problems; Soil moisture; Transpiration; Water supply systems; Hydraulic parameters; Inverse modeling; Root development; Root distribution; Root-water uptake; Sap flow measurements; Soil water content; Water distributions; Soil surveys; empirical analysis; growth rate; growth response; rhizosphere; root system; sap flow; soil water; soil-vegetation interaction; transpiration; water uptake; wheat; winter; Triticum aestivum
来源期刊	Hydrology and Earth System Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/160049
作者单位	Cai, G., Agrosphere, Institute of Bio- and Geosciences (IBG-3), Forschungszentrum Jülich GmbH, Jülich, 52428, Germany; Vanderborght, J., Agrosphere, Institute of Bio- and Geosciences (IBG-3), Forschungszentrum Jülich GmbH, Jülich, 52428, Germany; Langensiepen, M., Institute of Crop Science and Resource Conservation, Faculty of Agriculture, University of Bonn, Katzenburgweg 5, Bonn, 53115, Germany; Schnepf, A., Agrosphere, Institute of Bio- and Geosciences (IBG-3), Forschungszentrum Jülich GmbH, Jülich, 52428, Germany; Hüging, H., Institute of Crop Science and Resource Conservation, Faculty of Agriculture, University of Bonn, Katzenburgweg 5, Bonn, 53115, Germany; Vereecken, H., Agrosphere, Institute of Bio- and Geosciences (IBG-3), Forschungszentrum Jülich GmbH, Jülich, 52428, Germany
推荐引用方式 GB/T 7714	Cai G.,Vanderborght J.,Langensiepen M.,et al. Root growth; water uptake; and sap flow of winter wheat in response to different soil water conditions[J],2018,22(4).
APA	Cai G.,Vanderborght J.,Langensiepen M.,Schnepf A.,Hüging H.,&Vereecken H..(2018).Root growth; water uptake; and sap flow of winter wheat in response to different soil water conditions.Hydrology and Earth System Sciences,22(4).
MLA	Cai G.,et al."Root growth; water uptake; and sap flow of winter wheat in response to different soil water conditions".Hydrology and Earth System Sciences 22.4(2018).