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Footprint radius of a cosmic-ray neutron probe for measuring soil-water content and its spatiotemporal variability in an alpine meadow ecosystem
Zhu, Xuchao1; Cao, Ruixue2,3; Shao, Mingan2,3; Liang, Yin1
2018-03-01
Source PublicationJOURNAL OF HYDROLOGY
ISSN0022-1694
Volume558Pages:1-8
Corresponding AuthorShao, Mingan(shaoma@igsnrr.ac.cn)
AbstractCosmic-ray neutron probes (CRNPs) have footprint radii for measuring soil-water content (SWC). The theoretical radius is much larger at high altitude, such as the northern Tibetan Plateau, than the radius at sea level. The most probable practical radius of CRNPs for the northern Tibetan Plateau, however, is not known due to the lack of SWC data in this hostile environment. We calculated the theoretical footprint of the CRNP based on a recent simulation and analyzed the practical radius of a CRNP for the northern Tibetan Plateau by measuring SWC at 113 sampling locations on 21 measuring occasions to a depth of 30 cm in a 33.5 ha plot in an alpine meadow at 4600 m a.s.l. The temporal variability and spatial heterogeneity of SWC within the footprint were then analyzed. The theoretical footprint radius was between 360 and 420 m after accounting for the influences of air humidity, soil moisture, vegetation and air pressure. A comparison of SWCs measured by the CRNP and a neutron probe from access tubes in circles with different radii conservatively indicated that the most probable experimental footprint radius was >200 m. SWC within the CRNP footprint was moderately variable over both time and space, but the temporal variability was higher. Spatial heterogeneity was weak, but should be considered in future CRNP calibrations. This study provided theoretical and practical bases for the application and promotion of CRNPs in alpine meadows on the Tibetan Plateau. (C) 2018 Elsevier B.V. All rights reserved.
KeywordSoil-water content Cosmic-ray neutron probe Footprint radius Spatial heterogeneity Alpine meadow
DOI10.1016/j.jhydrol.2018.01.022
WOS KeywordNORTHERN TIBETAN PLATEAU ; FIELD-SCALE ; MOISTURE ; CALIBRATION ; DYNAMICS ; SENSORS ; CHINA
Indexed BySCI
Language英语
Funding ProjectInstitute of Soil Science, CAS[ISSASIP1617] ; Key Technologies Research and Development Program of China[2014BAD15130302] ; Natural Science Foundation of Jiangsu Province, China[BK2015610]
Funding OrganizationInstitute of Soil Science, CAS ; Key Technologies Research and Development Program of China ; Natural Science Foundation of Jiangsu Province, China
WOS Research AreaEngineering ; Geology ; Water Resources
WOS SubjectEngineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS IDWOS:000427338900001
PublisherELSEVIER SCIENCE BV
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/57309
Collection中国科学院地理科学与资源研究所
Corresponding AuthorShao, Mingan
Affiliation1.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Nanjing 210008, Jiangsu, Peoples R China
2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, 11A Datun Rd, Beijing 100101, Peoples R China
3.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Zhu, Xuchao,Cao, Ruixue,Shao, Mingan,et al. Footprint radius of a cosmic-ray neutron probe for measuring soil-water content and its spatiotemporal variability in an alpine meadow ecosystem[J]. JOURNAL OF HYDROLOGY,2018,558:1-8.
APA Zhu, Xuchao,Cao, Ruixue,Shao, Mingan,&Liang, Yin.(2018).Footprint radius of a cosmic-ray neutron probe for measuring soil-water content and its spatiotemporal variability in an alpine meadow ecosystem.JOURNAL OF HYDROLOGY,558,1-8.
MLA Zhu, Xuchao,et al."Footprint radius of a cosmic-ray neutron probe for measuring soil-water content and its spatiotemporal variability in an alpine meadow ecosystem".JOURNAL OF HYDROLOGY 558(2018):1-8.
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