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VALIDATING A BASIC ASSUMPTION OF USING CESIUM-137 METHOD TO ASSESS SOIL LOSS IN A SMALL AGRICULTURAL CATCHMENT
Ni, L. S.1,2; Fang, N. F.1,2; Shi, Z. H.2,3; Chen, F. X.4; Wang, L.1,2; Fang, NF (reprint author), Northwest A&F Univ, State Key Lab Soil Eros & Dryland Farming Loess P, 26th Xinong Rd, Yangling 712100, Peoples R China.
SubtypeArticle
2017
Source PublicationLAND DEGRADATION & DEVELOPMENT
ISSN1085-3278
description.correspondentemailfnf@ms.iswc.ac.cn
Volume28Issue:5Pages:1772-1778
AbstractAlthough the fallout radionuclide Cs-137 technique has been widely used to provide soil redistribution estimates in recent decades, some researchers have recently challenged the usefulness of this technique. Thus, it is necessary to evaluate the usefulness of the Cs-137 technique to study soil redistribution, especially in areas that suffer from severe soil erosion and where the Cs-137 inventory distributions vary. This study analyses the abundance of Cs-137 deposited in sediment trapped by a check dam over 31 years in a small agriculture catchment in the Loess Plateau, which has experienced some of the most extensive agricultural soil erosion in the world. The Cs-137 inventory and soil loss were evaluated, and the results indicated that the sediment deposition rate behind the check dam was approximately 38 cm/year. The specific soil erosion rate of the catchment is estimated to be 178 t ha(-1) year(-1). A geochemical properties fingerprinting method indicated that the ratio of the inter-gully erosion from cropland to gully erosion was 0.46:0.54 during the investigated period of 31-year period. Our results suggest that the Cs-137 technique cannot be directly used in the study catchment. Gully erosion is the main type of soil erosion that occurs in the loess catchment, and the amount of gully erosion changes from year to year. Therefore, the abundance of Cs-137 cannot be used to estimate soil redistribution where gully erosion is severe. However, after calibration, the inter-gully soil loss was consistently related to Cs-137 abundance, which means that the Cs-137 technique can be used at the plot or slope scale on the Loess Plateau. Our results also reveal the particle-size selectivity of soil detachment and sediment deposition during runoff-erosion events. The average Cs-137 content of the fine group couplets is 63% greater than the Cs-137 content of the coarse group. When the studied section spans more than 15 years, the Cs-137 inventory is consistent (R-2 = 0.95, p < 0.01) with soil loss, which means that the selectivity may be offset over a long period. Our results confirm that the Cs-137 method requires careful planning when applied at the catchment scale. Copyright (C) 2017 John Wiley & Sons, Ltd.
KeywordCesium-137 Method Soil Erosion Catchment Fingerprinting Method Check Dam
Subject AreaEnvironmental Sciences & Ecology ; Agriculture
DOI10.1002/ldr.2708
URL查看原文
Indexed BySCI
Publication PlaceHOBOKEN
Language英语
WOS IDWOS:000407990500026
PublisherWILEY
Funding OrganizationNational Natural Science Foundation of China [41525003, 41671282] ; National Natural Science Foundation of China [41525003, 41671282]
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Document Type期刊论文
Identifierhttp://ir.iswc.ac.cn/handle/361005/7963
Collection水保所科研产出--SCI_2017--SCI
Corresponding AuthorFang, NF (reprint author), Northwest A&F Univ, State Key Lab Soil Eros & Dryland Farming Loess P, 26th Xinong Rd, Yangling 712100, Peoples R China.
Affiliation1.Northwest A&F Univ, State Key Lab Soil Eros & Dryland Farming Loess P, 26th Xinong Rd, Yangling 712100, Peoples R China
2.Chinese Acad Sci, Inst Soil & Water Conservat, Yangling 712100, Peoples R China
3.Minist Water Resources, Yangling 712100, Peoples R China
4.Huazhong Agr Univ, Coll Resources & Environm, Wuhan 430070, Hubei, Peoples R China
Recommended Citation
GB/T 7714
Ni, L. S.,Fang, N. F.,Shi, Z. H.,et al. VALIDATING A BASIC ASSUMPTION OF USING CESIUM-137 METHOD TO ASSESS SOIL LOSS IN A SMALL AGRICULTURAL CATCHMENT[J]. LAND DEGRADATION & DEVELOPMENT,2017,28(5):1772-1778.
APA Ni, L. S.,Fang, N. F.,Shi, Z. H.,Chen, F. X.,Wang, L.,&Fang, NF .(2017).VALIDATING A BASIC ASSUMPTION OF USING CESIUM-137 METHOD TO ASSESS SOIL LOSS IN A SMALL AGRICULTURAL CATCHMENT.LAND DEGRADATION & DEVELOPMENT,28(5),1772-1778.
MLA Ni, L. S.,et al."VALIDATING A BASIC ASSUMPTION OF USING CESIUM-137 METHOD TO ASSESS SOIL LOSS IN A SMALL AGRICULTURAL CATCHMENT".LAND DEGRADATION & DEVELOPMENT 28.5(2017):1772-1778.
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