Field-scale variation of preferential flow as indicated from dye coverage

Öhrström, Pernilla; Persson, Magnus; Albergel, Jean; Zante, Patrick; Nasri, Slah; Berndtsson, Ronny; Olsson, Jonas

doi:10.1016/s0022-1694(01)00537-6

Cited by 70 publications

(47 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The results were in agreement with Noguchi et al (1997) and Hagedorn & Bundt (2002). Dye coverage decreased with the increasing soil depth from soil surface which supported more studies (Öhrström et al, 2002;Kramers et al, 2009), while some studies also indicated that the amount of stained area per depth (dye coverage) decreased to a depth and afterwards increased (Bogner et al, 2013). Ecologists attribute the results to macropores density (e.g., root channels, rock Influences of plant roots on soil preferential flow in forest ecosystems erential pathways (Li & Ghodrati, 1994;Jøergensen et al, 2002) to prompt water infiltration after their decay (Beven & Germann, 1982).…”

Section: Soil Preferential Flow In the Soil Profilessupporting

confidence: 91%

Effects of fine root length density and root biomass on soil preferential flow in forest ecosystems

et al. 2015

View full text Add to dashboard Cite

Aim of study: The study was conducted to characterize the impacts of plant roots systems (e.g., root length density and root biomass) on soil preferential flow in forest ecosystems.Area of study: The study was carried out in Jiufeng National Forest Park, Beijing, China.Material and methods: The flow patterns were measured by field dye tracing experiments. Different species (Sophora japonica Linn, Platycladus orientalis Franco, Quercus dentata Thunb) were quantified in two replicates, and 12 soil depth were applied. Plant roots were sampled in the sieving methods. Root length density and root biomass were measured by WinRHIZO. Dye coverage was implied in the image analysis, and maximum depth of dye infiltration by direct measurement.Main results: Root length density and root biomass decreased with the increasing distance from soil surface, and root length density was 81.6% higher in preferential pathways than in soil matrix, and 66.7% for root biomass with respect to all experimental plots. Plant roots were densely distributed in the upper soil layers. Dye coverage was almost 100% in the upper 5-10 cm, but then decreased rapidly with soil depth. Root length density and root biomass were different from species: Platycladus orientalis Franco > Quercus dentata Thunb > Sophora japonica Linn.Research highlights: The results indicated that fine roots systems had strong effects on soil preferential flow, particularly root channels enhancing nutrition transport across soil profiles in forest dynamics.Key words: soil preferential flow; preferential pathways; soil matrix; root length density; root biomass.

show abstract

Section: Soil Preferential Flow In the Soil Profilessupporting

confidence: 91%

Effects of fine root length density and root biomass on soil preferential flow in forest ecosystems

et al. 2015

View full text Add to dashboard Cite

show abstract

“…While the previous studies of the field observations (van Dam et al, 1990;Larsson et al, 1999;Ohrstrom et al, 2002) supported this theory, an in-depth evaluation on the ARM has not yet been conducted.…”

Section: Introductionmentioning

confidence: 93%

Characterizing soil preferential flow using iodine–starch staining experiments and the active region model

Feng

Wang

Zhang

et al. 2009

Journal of Hydrology

View full text Add to dashboard Cite

Thirteen iodine-starch staining experiments with different boundary conditions and measurement scales were conducted at two sites to study preferential flow processes in natural unsaturated soils. Digital imaging analyses were implemented to obtain the corresponding preferential flow patterns. The test results are used to evaluate a recently proposed active region model in terms of its usefulness and robustness for characterizing unsaturated flow processes at field scale.Test results provide useful insights into flow patterns in unsaturated soils. They show that flow pattern depends on the top boundary condition. As the total infiltrating-water depth increased form 20 mm to 80 mm for the 100×100 cm 2 plots, the corresponding flow pattern changed from few preferential flow paths associated with a relatively small degree of stained coverage and a small infiltration depth, to a pattern characterized by a higher stained coverage and a larger infiltration depth, and to Although further studies are needed to confirm this finding, it seems to be consistent with a consideration that some fractal parameters (e.g., fractal dimension)are universal for a large range of scales.

show abstract

“…Refs. [21,22] also noticed that the dye penetrations for two test sites (corresponding to a clayey and a sandy soil) are characterized by power-law mean power spectrum, a signature of fractal pattern. Ref.…”

Section: Introductionmentioning

confidence: 95%

“…Field-scale preferential flow is caused by a number of well-known mechanisms. First, under flooding and/or high-infiltration-rate conditions, water can flow very quickly along macropores (such as cracks and fissures) in structured soils [2,3,6,7,21] . Second, because of the high nonlinearity of the unsaturated flow process, an infiltrating water front can become unstable and split into "fingers" even for relatively homogeneous, structureless soils [4,8,11,34] .…”

Section: Introductionmentioning

confidence: 99%

Macroscopic relationship for preferential flow in the vadose zone: Theory and validation

Liu

Zhang

2009

Sci. China Ser. E-Technol. Sci.

View full text Add to dashboard Cite

Preferential flow commonly observed in unsaturated soils allows rapid movement of solute from the ground surface or vadose zone to the groundwater, bypassing a significant volume of unsaturated soil and increasing the risk of groundwater contamination. A variety of evidence indicates that complex preferential flow patterns observed from fields are fractals. This paper discusses a macroscopic relationship for modeling preferential flow in the vadose zone. Conceptually, the flow domain can be divided into active and inactive regions. Flow occurs preferentially in the active region (characterized by fractals), and inactive region is simply bypassed. The portion of the active region was found to be a power function of saturation. The validity of this macroscopic relationship is demonstrated by its consistency with field observations and the related numerical experiments.preferential flow, constitutive relations, vadose zone hydrology

show abstract

Field-scale variation of preferential flow as indicated from dye coverage

Cited by 70 publications

References 22 publications

Effects of fine root length density and root biomass on soil preferential flow in forest ecosystems

Effects of fine root length density and root biomass on soil preferential flow in forest ecosystems

Characterizing soil preferential flow using iodine–starch staining experiments and the active region model

Macroscopic relationship for preferential flow in the vadose zone: Theory and validation

Contact Info

Product

Resources

About