Inference of Soil Hydrologic Parameters from Electronic Soil Moisture Records

Frontiers in Digital Humanities

Chandler, David G.¹  Hwang, Kyotaek¹  McNamara, James P.²  Seyfried, Mark S.³ 

[1] Civil and Environmental Engineering, Syracuse University, Syracuse, NY, USA;Department of Geosciences, Boise State University, Boise, ID, USA;USDA Agricultural Research Service, Northwest Watershed Research Center, Boise, ID, USA

关键词: Saturation;    Field capacity;    plant water stress;    Permanent wilting point;    Hysteresis;   

DOI  :  10.3389/feart.2017.00025

学科分类：社会科学、人文和艺术（综合）

来源: Frontiers

【 摘 要 】

Soil moisture is an important control on hydrologic function, as it governs vertical fluxes from and to the atmosphere, groundwater recharge and lateral fluxes through the soil. Historically, the traditional model parameters of saturation, field capacity and permanent wilting point have been determined by laboratory methods. This approach is challenged by issues of scale, boundary conditions and soil disturbance. We develop and compare four methods to determine values of field saturation, field capacity, plant extraction limit and initiation of plant water stress from long term in-situ monitoring records of TDR-measured volumetric water content (. The monitoring sites represent a range of soil textures, soil depths, effective precipitation and plant cover types in a semi-arid climate. The  records exhibit attractors (high frequency values) that correspond to field capacity and the plant extraction limit at both annual and longer time scales, but the field saturation values vary by year depending on seasonal wetness in the semi-arid setting. The analysis for five sites in two watersheds is supported by comparison to values determined by a common pedotransfer function and measured soil characteristic curves. Frozen soil is identified as a complicating factor for the analysis and users are cautioned to filter data by temperature, especially for near surface soils.

【 授权许可】

CC BY