Footprint radius of a cosmic-ray neutron probe for measuring soil-water content and its spatiotemporal variability in an alpine meadow ecosystem

doi:10.1016/j.jhydrol.2018.01.022

	Footprint radius of a cosmic-ray neutron probe for measuring soil-water content and its spatiotemporal variability in an alpine meadow ecosystem
	Zhu, Xuchao 1; Cao, Ruixue 2,3; Shao, Mingan 2,3; Liang, Yin 1
刊名	JOURNAL OF HYDROLOGY
	2018-03-01
卷号	558 页码:1-8
关键词	Soil-water content Cosmic-ray neutron probe Footprint radius Spatial heterogeneity Alpine meadow
ISSN号	0022-1694
DOI	10.1016/j.jhydrol.2018.01.022
通讯作者	Shao, Mingan(shaoma@igsnrr.ac.cn)
英文摘要	Cosmic-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.
资助项目	Institute of Soil Science, CAS[ISSASIP1617] ; Key Technologies Research and Development Program of China[2014BAD15130302] ; Natural Science Foundation of Jiangsu Province, China[BK2015610]
WOS关键词	NORTHERN TIBETAN PLATEAU ; FIELD-SCALE ; MOISTURE ; CALIBRATION ; DYNAMICS ; SENSORS ; CHINA
WOS研究方向	Engineering ; Geology ; Water Resources
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000427338900001
资助机构	Institute of Soil Science, CAS ; Key Technologies Research and Development Program of China ; Natural Science Foundation of Jiangsu Province, China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/57308]
专题	中国科学院地理科学与资源研究所
通讯作者	Shao, Mingan
作者单位	1.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
推荐引用方式 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.