IMHE OpenIR  > 山地表生过程与生态调控重点实验室
Tracing water flow from sloping farmland to streams using oxygen-18 isotope to study a small agricultural catchment in southwest China
Zhao, Pei1; Tang, Xiangyu1; Zhao, Peng2; Wang, Chao1; Tang, Jialiang1
Corresponding AuthorXiangyu Tang
2013
Source PublicationSOIL & TILLAGE RESEARCH
ISSN0167-1987
EISSN1879-3444
Volume134Pages:180-194
SubtypeArticle
AbstractKnowledge of the age and origins of water and its movement from hillslopes to streams is important in mapping aquifers, conserving water supplies, determining water-use policy, and controlling pollution. In a sloping farmland-dominated agricultural catchment in southwest China, a stable isotope tracer (O-18) combined with hydrometric measurements was tested to determine the rainwater movement from a hillslope to a stream during three storm events. The results showed that underflow in finely fractured rocks accounted for the highest proportion of the total flow on the slope, indicating that vertical flow was the predominant water flow pattern on the hillslope. The surface flow had basically the same delta O-18 value as the coinstantaneous rainfall, indicating that it was a Hortonian overland flow. The two end-member separation model showed that pre-event water accounted for a large proportion of the hillslope subsurface flows and streamflow especially during the initial stage. The first sample of underflow and interflow water always contained significant rainwater, indicating that macropore flow was prevalent in this Entisol. Event water dominated the peak streamflow and accounted for 70.4%, 95.6% and 80.4% of the peakflow amount during the three storm events. In general, the results suggested that pre-event water dominated the initial stage of stormflow generation and that event water dominated the peakflow. During the recession period, hillslope subsurface flows were the main source of the streamflow, as indicated by the similar volume-weighted delta O-18 value in subsurface flows and stream water. In future studies, hydrological processes under various land uses should be monitored synchronously to better understand the mechanisms of stormflow generation and transport regarding non-point source pollution in agricultural catchments. (C) 2013 Elsevier B.V. All rights reserved.
KeywordHillslope Hydrology Hydrograph Separation Oxygen-18 Subsurface Flow Water Flow Path
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
DOI10.1016/j.still.2013.08.005
WOS Subject ExtendedAgriculture
Indexed BySCI
WOS KeywordHUMID HEADWATER CATCHMENTS ; STORM RUNOFF GENERATION ; HYDROGRAPH SEPARATION ; RAIN-FOREST ; HILLSLOPE ; BASIN ; SOIL ; MACROPORES ; TRANSPORT ; TRACERS
Language英语
Quartile2区
TOP
WOS SubjectSoil Science
WOS IDWOS:000326553700022
Funding OrganizationNational Natural Science Foundation of China(41101202) ; National Basic Research Program of the Ministry of Science and Technology of China(2012CB417101) ; NSFC(40801101) ; Hundred Talents Program of the Chinese Academy of Sciences ; Sichuan Province
Citation statistics
Cited Times:19[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/6549
Collection山地表生过程与生态调控重点实验室
Affiliation1.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Surface Proc & Ecol Regulat, Chengdu 610041, Peoples R China
2.Southwest Univ, Coll Resources & Environm, Chongqing 400715, 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. Tracing water flow from sloping farmland to streams using oxygen-18 isotope to study a small agricultural catchment in southwest China[J]. SOIL & TILLAGE RESEARCH,2013,134:180-194.
APA Zhao, Pei,Tang, Xiangyu,Zhao, Peng,Wang, Chao,&Tang, Jialiang.(2013).Tracing water flow from sloping farmland to streams using oxygen-18 isotope to study a small agricultural catchment in southwest China.SOIL & TILLAGE RESEARCH,134,180-194.
MLA Zhao, Pei,et al."Tracing water flow from sloping farmland to streams using oxygen-18 isotope to study a small agricultural catchment in southwest China".SOIL & TILLAGE RESEARCH 134(2013):180-194.
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