IMHE OpenIR  > 山地表生过程与生态调控重点实验室
The nitrogen loss flushing mechanism in sloping farmlands of shallow Entisol in southwestern China: a study of the water source effect
Zhao, Pei1,2; Tang, Xiangyu2; Tang, Jialiang2; Zhu, Bo2
Corresponding AuthorTang, Xiangyu
2015
Source PublicationARABIAN JOURNAL OF GEOSCIENCES
ISSN1866-7511
EISSN1866-7538
Volume8Issue:12Pages:10325-10337
SubtypeArticle
AbstractThe mechanisms that cause the rapid and abundant release of nitrogen from hill slope farmlands into streams are still poorly understood. In hilly areas composed of purple soils high in nitrogen pollution content, TN, NO3-N, NH4-N, NO2-N, PN, and D/H, isotopic ratios loss processes were monitored in two sloping farmland plots over the course of two storms. The results show that the dominant transportation pathway of nitrogen loss involved NO3-N movement was through the subsurface flow both vertically and laterally. Subsurface flow can also contribute to significant degrees of PN loss. TN and PN peaks occurred before the subsurface flow peak was reached in every case. However, NO3-N peaks occurred both before and after flow peaks occurred. Hydrograph separation using delta D shows that preferential flows dominated the generation of subsurface flows with low NO3-N concentrations. The delta D profile response to rainwater shows that piston flows caused the accumulation of high soil water quantities in the outflow. Most of the samples demonstrated that dissolved inorganic nitrogen concentrations are positively correlated with outflow soil water proportions. Consequently, the piston flow type is assumed to have caused high degrees of dissolved nitrogen loss in the examined sloping farmlands. After being dispelled by the piston flow, preferential flows acted as the main transportation carrier of nitrogen in the runoff. These results suggest that the soil water proportions in flows significantly influence levels of dissolved nitrogen loss.
KeywordDeuterium Isotope Hydrograph Separation Hydrological Control Nitrogen Transport Subsurface Flow
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1007/s12517-015-1983-4
WOS Subject ExtendedGeology
Indexed BySCI
WOS KeywordINTERMITTENT MEDITERRANEAN STREAM ; PREFERENTIAL FLOW ; NITRATE MOBILITY ; UNSATURATED SOIL ; CATCHMENT ; RUNOFF ; HILLSLOPE ; RAINFALL ; QUALITY ; DENITRIFICATION
Language英语
Quartile4区
TOP
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000365450800013
Funding OrganizationNational Basic Research Program of the Ministry of Science and Technology of China ; National Natural Science Foundation of China(41471188 ; Hundred Talents Program of the Chinese Academy of Sciences ; Sichuan Province ; 41371241)
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Cited Times:11[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/13938
Collection山地表生过程与生态调控重点实验室
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
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,Tang, Jialiang,et al. The nitrogen loss flushing mechanism in sloping farmlands of shallow Entisol in southwestern China: a study of the water source effect[J]. ARABIAN JOURNAL OF GEOSCIENCES,2015,8(12):10325-10337.
APA Zhao, Pei,Tang, Xiangyu,Tang, Jialiang,&Zhu, Bo.(2015).The nitrogen loss flushing mechanism in sloping farmlands of shallow Entisol in southwestern China: a study of the water source effect.ARABIAN JOURNAL OF GEOSCIENCES,8(12),10325-10337.
MLA Zhao, Pei,et al."The nitrogen loss flushing mechanism in sloping farmlands of shallow Entisol in southwestern China: a study of the water source effect".ARABIAN JOURNAL OF GEOSCIENCES 8.12(2015):10325-10337.
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