Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.22/7268
Título: Effects of Soil Compaction and Organic Carbon Content on Preferential Flow in Loamy Field Soils
Autor: Soares, António
Moldrup, Per
Vendelboe, Anders Lindblad
Katuwal, Sheela
Norgaard, Trine
Delerue-Matos, Cristina
Tuller, Markus
Jonge, Lis W. de
Palavras-chave: Preferential flow
Chemical transport
Hydraulic conductivity
Bulk density
Organic carbon
Macropores
Data: Jan-2015
Editora: Wolters Kluwer Health, Inc
Relatório da Série N.º: Soil Science;Vol. 180, Issue 1
Resumo: Abstract: Preferential flow and transport through macropores affect plant water use efficiency and enhance leaching of agrochemicals and the transport of colloids, thereby increasing the risk for contamination of groundwater resources. The effects of soil compaction, expressed in terms of bulk density (BD), and organic carbon (OC) content on preferential flow and transport were investigated using 150 undisturbed soil cores sampled from 15 × 15–m grids on two field sites. Both fields had loamy textures, but one site had significantly higher OC content. Leaching experiments were conducted in each core by applying a constant irrigation rate of 10 mm h−1 with a pulse application of tritium tracer. Five percent tritium mass arrival times and apparent dispersivities were derived from each of the tracer breakthrough curves and correlated with texture, OC content, and BD to assess the spatial distribution of preferential flow and transport across the investigated fields. Soils from both fields showed strong positive correlations between BD and preferential flow. Interestingly, the relationships between BD and tracer transport characteristics were markedly different for the two fields, although the relationship between BD and macroporosity was nearly identical. The difference was likely caused by the higher contents of fines and OC at one of the fields leading to stronger aggregation, smaller matrix permeability, and a more pronounced pipe-like pore system with well-aligned macropores.
URI: http://hdl.handle.net/10400.22/7268
DOI: 10.1097/SS.0000000000000105
Versão do Editor: http://journals.lww.com/soilsci/Abstract/2015/01000/Effects_of_Soil_Compaction_and_Organic_Carbon.3.aspx
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