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Within-Year Changes in Hydraulic Properties of a Shallow Entisol in Farmland and Forestland
Wang, Hong-Lan1,2; Tang, Xiang-Yu1; Zhang, Wei1; Song, Song-Bai3; McKenzie, Blair M.4
Corresponding AuthorTang, Xiang-Yu
Volume14Issue:7Pages:DOI: 10.1038/srep14939
AbstractFor regions with shallow soils underlain by fractured parent rocks, it is important to understand the characteristics of soil water retention and hydraulic conductivity. This knowledge could support the development of strategies to manage water for crops. A farmland and a forestland with thin Entisols, located in hilly central Sichuan on the Yangtze River's upper reaches, were chosen as experimental fields. A variety of parameters related to hydraulically effective macroporosity (pore radius > 125 mu m), the single-porosity van Genuchten model, and the dual-porosity bi-exponential (BE) model for water retention characteristics were determined. Tension infiltration data showed that soil macropores were the main pores (accounting for 87.9-99.7%) contributing to fast drainage at all tested soil depths under both land uses in the rainy summer, in spite of their very low percentage of the total porosity (0.61-3.06%). The available soil water content, determined as the drainable soil textural porosity using the bi-exponential model (theta(txt-BE)), was found to be very low (0.032-0.091 m(3) m(-3)) and negatively (P < 0.05) related to the initial soil water content at the time of sampling, resulting in high vulnerability of the crops grown on the farmland to drought. Plowing operations and periodical drying appeared to be the two main factors controlling the within-year change in soil hydraulic properties. For agricultural soils showing a bimodal pore size distribution, the soil's capacity to hold crop-available water in textural pores, which may vary with the time of year, rather than the total soil water content should be analyzed to inform decisions on irrigation operations including required amounts.
KeywordPhysical Sciences
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine ; Physical Sciences
WOS Subject ExtendedEnvironmental Sciences & Ecology ; Agriculture ; Water Resources
Indexed BySCI
WOS SubjectEnvironmental Sciences ; Soil Science ; Water Resources
WOS IDWOS:000362065200010
Funding OrganizationNational Basic Research Program of the Ministry of Science and Technology of China(2012CB417101) ; CAS-SAFEA International Partnership Program for Creative Research Team(KZZD-EW-TZ-06) ; National Natural Science Foundation of China(41171372 ; Hundred Talents Program of the Chinese Academy of Sciences ; Sichuan Province ; Scottish Government, Rural and Environment Science and Analytical Services Division ; 41471268)
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Cited Times:15[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Surface Proc & Ecol Regulat, Chengdu 610041, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Northwest A&F Univ, Coll Water Resources & Architectural Engn, Yangling 712100, Peoples R China
4.James Hutton Inst, Dundee DD2 5DA, Scotland
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
Wang, Hong-Lan,Tang, Xiang-Yu,Zhang, Wei,et al. Within-Year Changes in Hydraulic Properties of a Shallow Entisol in Farmland and Forestland[J]. VADOSE ZONE JOURNAL,2015,14(7):DOI: 10.1038/srep14939.
APA Wang, Hong-Lan,Tang, Xiang-Yu,Zhang, Wei,Song, Song-Bai,&McKenzie, Blair M..(2015).Within-Year Changes in Hydraulic Properties of a Shallow Entisol in Farmland and Forestland.VADOSE ZONE JOURNAL,14(7),DOI: 10.1038/srep14939.
MLA Wang, Hong-Lan,et al."Within-Year Changes in Hydraulic Properties of a Shallow Entisol in Farmland and Forestland".VADOSE ZONE JOURNAL 14.7(2015):DOI: 10.1038/srep14939.
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