干旱区生态环境知识资源中心(Arid): Soil structure and soil moisture dynamics inferred from time-lapse electrical resistivity tomography

Arid

DOI	10.1016/j.catena.2021.105553
	Soil structure and soil moisture dynamics inferred from time-lapse electrical resistivity tomography
	Nielson, Travis; Bradford, John; Pierce, Jen; Seyfried, Mark
通讯作者	Nielson, T (corresponding author), Olson Engn, Bridge City, TX 77611 USA. ; Nielson, T (corresponding author), Boise State Univ, Boise, ID 83725 USA.
来源期刊	CATENA
ISSN	0341-8162
EISSN	1872-6887
出版年	2021
卷号	207
英文摘要	The semi-arid sagebrush steppe in the western United States faces pressures from the agriculture industry, recreation use, invasive grasses, and a changing climate. A key to facilitating the healthy management of this ecosystem is understanding the distribution and behavior of soil moisture in the vadose zone in both natural and agricultural settings. Within unsaturated environments, soil moisture is spatially and temporally heterogeneous, and changes in porosity and permeability within arid soils complicate characterization of soil hydrologic properties. Importantly, accumulations of 'caliche' or pedogenic calcium carbonate in arid soils can greatly limit permeability; however, observing the role that caliche plays in the hydrologic process is difficult because the installation of in situ instruments disturbs the soils and only provides information at a single point. To investigate vadose zone processes on a broad temporal and spatial scale, we installed a 7x8m(2) electrical resistivity tomography (ERT) array at the Reynolds Creek Critical Zone Observatory in southwestern Idaho. Existing soil moisture observations show that infiltration is limited to depths less than 60 cm at this site, as compared to at least 90 cm at other sites in the watershed. To capture the seasonal wetting and drying of the soils, as well as the soils' response to rainfall events, we monitored the site bi-weekly during the spring, summer, and fall of 2015 and 2016. A time-lapse ERT array was placed adjacent to coaxial impedance dielectric reflectometry (CIDR) probes so that the time-lapse ERT data could be referenced to precise measurements of volumetric water content. In addition to the measurements provided by the ERT array and CIDR probes, soil texture analysis and soil profile descriptions from a near-by soil pit show typical arid soil morphology, with accumulations of clays and calcium carbonate in the B horizon. The resulting ERT inversions show the following soil structure: (1) a high-resistivity top layer corresponding with minor amounts of pedogenic calcium carbonate; (2) a low-resistivity intermediate layer at depths corresponding with substantial accumulations (stage IV) of carbonate; and (3) a high-resistivity deep saprolite. The resistivity of the top layer varies seasonally with changes in precipitation, while the intermediate carbonate soil layer does not. This agrees well with the changes in soil moisture with depth measured by the CIDR probes and suggests that the top of the carbonate soil layer limits infiltration. However vertical structure and cracks within the carbonate soil layer create vertical preferential flow paths; resistivity within these flow paths responds to large precipitation events and seasonal changes in soil moisture. This implies that the preferential flow paths are a conduit for soil moisture flow that is not captured by the CIDR probes. From the combined interpretation of the ERT and CIDR we conclude that soil structure and the presence of calcic soil horizons inhibits soil moisture infiltration during both the summer dry months and the winter wet flux period; however, preferential flow paths provide an important vertical connection between the deep and shallow portions of the critical zone.
英文关键词	Soil infiltration Electrical resistivity tomography Seismic refraction Preferential flow path Critical zone
类型	Article
语种	英语
开放获取类型	hybrid
收录类别	SCI-E
WOS记录号	WOS:000703268900002
WOS关键词	PREFERENTIAL FLOW ; VADOSE ZONE ; WATER ; ERT ; CONSTRAINTS ; HILLSLOPES ; INVERSION ; STORAGE
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/2XILL650/362817
作者单位	[Nielson, Travis] Olson Engn, Bridge City, TX 77611 USA; [Bradford, John] Colorado Sch Mines, Golden, CO 80401 USA; [Nielson, Travis; Bradford, John; Pierce, Jen] Boise State Univ, Boise, ID 83725 USA; [Seyfried, Mark] USDA ARS, Washington, DC 20250 USA
推荐引用方式 GB/T 7714	Nielson, Travis,Bradford, John,Pierce, Jen,et al. Soil structure and soil moisture dynamics inferred from time-lapse electrical resistivity tomography[J],2021,207.
APA	Nielson, Travis,Bradford, John,Pierce, Jen,&Seyfried, Mark.(2021).Soil structure and soil moisture dynamics inferred from time-lapse electrical resistivity tomography.CATENA,207.
MLA	Nielson, Travis,et al."Soil structure and soil moisture dynamics inferred from time-lapse electrical resistivity tomography".CATENA 207(2021).