干旱区生态环境知识资源中心(Arid): Applicability of cosmic-ray neutron sensor for measuring soil moisture at the agricultural-pastoral ecotone in northwest China

Arid

DOI	10.1007/s11430-020-9650-2
	Applicability of cosmic-ray neutron sensor for measuring soil moisture at the agricultural-pastoral ecotone in northwest China
	Tan, Xingyan; Zhang, Lanhui; He, Chansheng; Zhu, Yuzuo; Han, Zhibo; Li, Xuliang
通讯作者	Zhang, LH ; He, CS
来源期刊	SCIENCE CHINA-EARTH SCIENCES
ISSN	1674-7313
EISSN	1869-1897
出版年	2020
卷号	63 期号:11 页码:1730-1744
英文摘要	Accurate monitoring of soil moisture is crucial in hydrological and ecological studies. Cosmic-ray neutron sensors (CRNS) measure area-average soil moisture at field scale, filling a spatial scale gap betweenin-situobservations and remote sensing measurements. However, its applicability has not been assessed in the agricultural-pastoral ecotone, a data scarce semi-arid and arid region in Northwest China (APENC). In this study, we calibrated and assessed the CRNS (the standardN(0)method) estimates of soil moisture. Results show that Pearson correlation coefficient,R-P, and the root mean square error (RMSE) between the CRNS soil moisture and the gravimetric soil moisture are 0.904 and less than 0.016 m(3)m(-3), respectively, indicating that the CRNS is able to estimate the area-average soil moisture well at our study site. Compared with thein-situsensor network measurements (ECH2O sensors), the CRNS is more sensitive to the changes in moisture in its footprint, which overestimates and underestimates the soil moisture under precipitation and dry conditions, respectively. The three shape parametersa(0),a(1),a(2)in the standard calibration equation (N(0)method) are not well suited to the study area. The calibrated parameters improved the accuracy of the CRNS soil moisture estimates. Due to the lack of low gravimetric soil moisture data, performance of the calibratedN(0)function is still poor in the extremely dry conditions. Moreover, aboveground biomass including vegetation biomass, canopy interception and widely developed biological soil crusts adds to the uncertainty of the CRNS soil moisture estimates. Such biomass impacts need to be taken into consideration to further improve the accuracy of soil moisture estimation by the CRNS in the data scarce areas such as agricultural-pastoral ecotone in Northwest China.
英文关键词	Soil moisture Cosmic-ray neutron sensor In-situobservations The agricultural-pastoral ecotone in Northwest China (APENC)
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000564942500001
WOS关键词	WATER CONTENT ; CALIBRATION ; SCALE ; AREA ; VALIDATION ; NETWORKS ; RUNOFF ; COVERS ; PROBE ; NDVI
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
来源机构	兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/325960
作者单位	[Tan, Xingyan; Zhang, Lanhui; He, Chansheng; Zhu, Yuzuo; Han, Zhibo; Li, Xuliang] Lanzhou Univ, Coll Earth & Environm Sci, Minist Educ, Key Lab West Chinas Environm Syst, Lanzhou 730000, Peoples R China; [He, Chansheng] Western Michigan Univ, Dept Geog, Kalamazoo, MI 49008 USA
推荐引用方式 GB/T 7714	Tan, Xingyan,Zhang, Lanhui,He, Chansheng,et al. Applicability of cosmic-ray neutron sensor for measuring soil moisture at the agricultural-pastoral ecotone in northwest China[J]. 兰州大学,2020,63(11):1730-1744.
APA	Tan, Xingyan,Zhang, Lanhui,He, Chansheng,Zhu, Yuzuo,Han, Zhibo,&Li, Xuliang.(2020).Applicability of cosmic-ray neutron sensor for measuring soil moisture at the agricultural-pastoral ecotone in northwest China.SCIENCE CHINA-EARTH SCIENCES,63(11),1730-1744.
MLA	Tan, Xingyan,et al."Applicability of cosmic-ray neutron sensor for measuring soil moisture at the agricultural-pastoral ecotone in northwest China".SCIENCE CHINA-EARTH SCIENCES 63.11(2020):1730-1744.