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

	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
来源期刊	中国科学. 地球科学
ISSN	1674-7313
出版年	2020
卷号	63 期号:11
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 between in-situ observations and remote sensing measurements.However,its applicability has not been assessed in the agricultural-pastoral ecotone,a data scarce semiarid and arid region in Northwest China(APENC).In this study,we calibrated and assessed the CRNS(the standard N_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 the in-situ sensor network measurements(ECH_2O 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 parameters a_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 calibrated N_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-situ observations The agricultural-pastoral ecotone in Northwest China(APENC)
类型	Article
语种	英语
收录类别	CSCD
WOS类目	Agriculture
CSCD记录号	CSCD:6823557
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/354044
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],2020,63(11).
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.中国科学. 地球科学,63(11).
MLA	Tan Xingyan,et al."Applicability of cosmic-ray neutron sensor for measuring soil moisture at the agricultural-pastoral ecotone in northwest China".中国科学. 地球科学 63.11(2020).