Journal ArticleDOI
Using Soil Water Content Sensors to Characterize Tillage Effects on Preferential Flow
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TLDR
In this article, the authors used soil water sensors placed horizontally in a rectangular grid along transects across crop rows to characterize the degree of preferential flow, the soil water content dynamics during short and long-term periods in the shallow zone (0-40 cm depth) of two plots with no-till (NT) and conventional tillage (CT) soil management practices.Abstract:
Because groundwater is a source of drinking water for many people, there is great concern to protect groundwater resources. Preferential flow through the unsaturated zone is considered one of the main contributory factors in groundwater pollution, which is influenced primarily by soil heterogeneity and management practices. To characterize the degree of preferential flow, the soil water content dynamics during short- and long-term periods in the shallow zone (0–40-cm depth) of two plots with no-till (NT) and conventional tillage (CT) soil management practices were investigated for 2 yr using soil water sensors placed horizontally in a rectangular grid along transects across crop rows. Analysis of response times and water content changes during rainfall events confirmed the existence of short-term preferential flow at the site and that macropores and heterogeneities in soil hydraulic parameters in the shallow zone may have contributed to infiltration into the deeper layers in the NT plot. In the longer term, the pathways of infiltration and redistribution were different between the growing and non-growing seasons; however, these differences were relatively stable in both plots during the 2-yr study period.read more
Citations
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Book ChapterDOI
Addressing Two Bottlenecks to Advance the Understanding of Preferential Flow in Soils
Li Guo,Henry Lin,Henry Lin +2 more
TL;DR: In this paper, a framework of six key categories of controls is developed to assess the susceptibility of various soils to preferential flow, and the mechanisms of different controlling factors affecting preferential flow are discussed using the proposed framework.
Journal ArticleDOI
Snow and frost: implications for spatiotemporal infiltration patterns ‐ a review
TL;DR: In this article, the authors show that large regions of the northern hemisphere are exposed to snowfall and seasonal frost, which has large effects on spatiotemporal distribution of infiltration and groundwater recharge processes.
Journal ArticleDOI
Characterization of tillage effects on the spatial variation of soil properties using ground-penetrating radar and electromagnetic induction
François Jonard,M.R. Mahmoudzadeh,Christian Roisin,Lutz Weihermüller,Frédéric André,Julien Minet,Harry Vereecken,Sébastien Lambot +7 more
TL;DR: In this paper, the authors evaluated the effects of different tillage practices on soil physical properties such as soil water content (SWC) by using geophysical methods, namely, ground-penetrating radar (GPR) and electromagnetic induction (EMI).
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Comparison of Simultaneous Soil Profile N2O Concentration and Surface N2O Flux Measurements Overwinter and at Spring Thaw in an Agricultural Soil
TL;DR: In this paper, a field experiment was carried out in Ontario, Canada to compare independently measured soil N2O profile concentration and surface N 2O flux measurements overwinter and at spring thaw, to estimate the soil n2O content accumulation overwinter, and estimate the magnitude of the contribution of the physical release of trapped N2Os to surface fluxes at spring-thaw.
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Field Performance of Five Soil Moisture Instruments in Heavy Clay Soils
TL;DR: Ojo et al. as discussed by the authors presented field performance of five Soil Moisture Instruments in Heavy Clay Soils Soil Physics and applied it to the field of soil physics.
References
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Journal ArticleDOI
Electromagnetic determination of soil water content: Measurements in coaxial transmission lines
TL;DR: The dependence of the dielectric constant, at frequencies between 1 MHz and 1 GHz, on the volumetric water content is determined empirically in the laboratory as discussed by the authors, and the effect of varying the texture, bulk density, temperature, and soluble salt content on this relationship was also determined.
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Journal ArticleDOI
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W. Heber Green,G. A. Ampt +1 more
TL;DR: In this article, the authors proposed that the measurement of S, Pα, Pω and K is of more importance than, and should replace, the determination of the sizes of the soil particles as in the usual "mechanical analysis" of soils.
Journal ArticleDOI
Temporal Stability of Spatially Measured Soil Water Probability Density Function
TL;DR: In this article, the authors analyzed soil water data collected from three different fields by two techniques (temporal analysis of the differences between individual and spatial average values; and Spearman's rank correlation) to search if time-invariant characteristic statistical properties of the probability density functioins can be assigned to individual locations.
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