干旱区生态环境知识资源中心(Arid): Variability of hydrogen sources within nominally anhydrous soil across a desert-oasis ecoregion, Northwest China

Arid

DOI	10.1016/j.catena.2024.108187
	Variability of hydrogen sources within nominally anhydrous soil across a desert-oasis ecoregion, Northwest China
	Wang, Shumin; Zhang, Yongyong; Kang, Wenrong; Wu, Shaoxiong
通讯作者	Zhang, YY
来源期刊	CATENA
ISSN	0341-8162
EISSN	1872-6887
出版年	2024
卷号	243
英文摘要	The accuracy of soil moisture measurements by cosmic-ray neutron sensing (CRNS) is significantly influenced by hydrogen sources within nominally anhydrous soil (NAS), particularly in arid regions. However, the variability of hydrogen in NAS, specifically soil lattice water (H2OL) and water equivalent of soil organic matter (H2OSOM), is seldom investigated in arid heterogeneous landscapes. This study assessed H2OL and H2OSOM amounts across four land covers (forest, cropland, gravel desert, and sandy desert) and three soil depths (0-10 cm, 10-20 cm, and 20-30 cm), and employed a support vector machine (SVM) to estimate H2OL amounts. Results indicated that H2OL amounts varied by land cover: 7.48 % in cropland, 6.06 % in forest, 5.78 % in gravel desert, and 3.17 % in sandy desert & sdot;H2OSOM amounts were 1.14 % in cropland, 0.71 % in forest, 0.65 % in sandy desert, and 0.27 % in gravel desert. The higher H2OL and H2OSOM in cropland and forest soils can be attributed to greater silt and clay fractions and organic matter content. Both H2OL and H2OSOM amounts decreased with soil depth. The SVM model accurately estimated H2OL amounts (R2 = 0.74) with a low root mean squared error (1.16 %), identifying soil organic matter as the key variable. Understanding the variability of H2OL and H2OSOM is crucial for accurate CRNS-based soil moisture estimation across diverse land covers, thereby enhancing the applications of CRNS in dry conditions.
英文关键词	Landscapes Lattice water Soil organic matter Soil property Support vector machine Water equivalent
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001261634100001
WOS关键词	RAY NEUTRON SENSORS ; ORGANIC-CARBON ; HEXI CORRIDOR ; MOISTURE ; CALIBRATION ; REGRESSION ; MINERALOGY ; TUTORIAL ; ECOTONE ; MANTLE
WOS类目	Geosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS研究方向	Geology ; Agriculture ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/403163
推荐引用方式 GB/T 7714	Wang, Shumin,Zhang, Yongyong,Kang, Wenrong,et al. Variability of hydrogen sources within nominally anhydrous soil across a desert-oasis ecoregion, Northwest China[J],2024,243.
APA	Wang, Shumin,Zhang, Yongyong,Kang, Wenrong,&Wu, Shaoxiong.(2024).Variability of hydrogen sources within nominally anhydrous soil across a desert-oasis ecoregion, Northwest China.CATENA,243.
MLA	Wang, Shumin,et al."Variability of hydrogen sources within nominally anhydrous soil across a desert-oasis ecoregion, Northwest China".CATENA 243(2024).