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Dynamics of water uptake by maize on sloping farmland in a shallow Entisol in Southwest China
Zhao, Pei1,2; Tang, Xiangyu2; Zhao, Peng3; Tang, Jialiang2
Corresponding AuthorXiangyu Tang
Source PublicationCATENA
AbstractThe water use patterns of maize grown in shallow soils remain poorly understood. To explore the water uptake dynamics of maize from a loamy Entisol with an average thickness of 40 cm, excavation, isotopic tracer analysis and soil water potential measurements were combined to study the source of water used by maize. The differences between the delta D of the water used by maize and the delta D of the mobile soil water (MSW, the fraction of soil water with high mobility which can be easily replaced by the infiltrating rainwater) indicated that maize did not take up much MSW. The local meteoric evaporation line, the delta D of the bulk soil water (BSW, total soil water including mobile and immobile soil water) and the soil water collected using a lysimeter were used in a model to calculate the isotopic compositions of different fractions of soil water and the proportion of immobile soil water (ImSW, the fraction of soil water with little mobility which was tightly bound to the soil particles). ImSW resulted from several heavy rains that occurred before the sampling. The primary water sources for maize varied temporally and spatially. Maize seedlings at the one-leaf stage used ImSW from 0 to 10 cm soil depth; however, maize plants generally used more BSW from deeper soil layers when the roots reached greater depths. The ratios of MSW to ImSW were-not equal between the maize stems and soil, with more ImSW in the maize stems, particularly during the seedling stage. This result invalidates the core concept of most watershed hydrology models and classical hypothesis in the isotopic models of general atmospheric circulation. The difference between the MSW and ImSW in the water cycle of the soil-plant-atmosphere continuum should be considered in the future studies of identifying the plant water sources and modeling hydrological processes. (C) 2016 Elsevier B.V. All rights reserved.
KeywordImmobile Soil Water Maize Water Use Mobile Soil Water Shallow Soil Stable Isotopes
WOS HeadingsScience & Technology ; Physical Sciences ; Life Sciences & Biomedicine
WOS Subject ExtendedGeology ; Agriculture ; Water Resources
Indexed BySCI
WOS SubjectGeosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS IDWOS:000385598800050
Funding OrganizationNational Basic Research Program of the Ministry of Science and Technology of China(2012CB417101) ; National Natural Science Foundation of China(41471188 ; Hundred Talents Program of the Chinese Academy of Sciences ; Sichuan Province ; 41101202 ; 41371241)
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Cited Times:7[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Shangluo Univ, Coll Urban Rural Planning & Architectural Engn, Shangluo 726000, Peoples R China
2.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Surface Proc & Ecol Regulat, Chengdu 610041, Peoples R China
3.Sichuan Univ, Coll Water Resource & Hydropower, Chengdu 610065, Peoples R China
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
Zhao, Pei,Tang, Xiangyu,Zhao, Peng,et al. Dynamics of water uptake by maize on sloping farmland in a shallow Entisol in Southwest China[J]. CATENA,2016,147:511-521.
APA Zhao, Pei,Tang, Xiangyu,Zhao, Peng,&Tang, Jialiang.(2016).Dynamics of water uptake by maize on sloping farmland in a shallow Entisol in Southwest China.CATENA,147,511-521.
MLA Zhao, Pei,et al."Dynamics of water uptake by maize on sloping farmland in a shallow Entisol in Southwest China".CATENA 147(2016):511-521.
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