Spatially distributed morphological characteristics of macropores in forest soils of Hitachi Ohta Experimental Watershed, Japan

S Noguchi; Y Tsuboyama; Roy C Sidle; I Hosoda

doi:10.1007/BF02348317

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Spatially distributed morphological characteristics of macropores in forest soils of Hitachi Ohta Experimental Watershed, Japan

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Spatially distributed morphological characteristics of macropores in forest soils of Hitachi Ohta Experimental Watershed, Japan

S Noguchi, Y Tsuboyama, Roy C Sidle and I Hosoda

Journal of Forest Research, Vol.2(4), pp.207-215

1997

DOI: https://doi.org/10.1007/BF02348317

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Abstract

Hitachi Ohta

macropore

morphological characteristics

root systems

subsurface flow

Morphological characteristics of macropores in forest soil profiles were investigated at Hitachi Ohta Experimental Watershed in Japan. Nine individual profiles at different locations (various spatial scales in a catchment) and twenty profiles at one site (a small spatial scale) were excavated to the bedrock to investigate density, origin, diameter, direction, and gradient of macropores. Macropore densities in a soil profile ranged from 3.5 to 29. l per m and from 5.4 to 75.1 per m2, respectively. Subsurface erosion, root channels, and interactions between subsurface erosion and root channels accounted for 36.9, 36.5, and 19.0%, of the described macropores. The mean macropore diameter in organic-rich soil layer (17-20 mm) was larger than in the B horizon (11-14 mm) at both spatial scales. The dominant gradients of all macropores in the organic-rich soil layer and B horizon were at negative oblique angles. Approximately 90% of the macropores in the organic-rich soil layer and approximately 80% of the macropores in the B horizon fell within the range between -50 and 50 degree planar direction. Subsurface flow and root systems are believed to play important roles in determining the morphological characteristics of macropores. These characteristics appear to have variable influences in different soil horizons rather than at different spatial scales.

Details

Title: Spatially distributed morphological characteristics of macropores in forest soils of Hitachi Ohta Experimental Watershed, Japan
Authors: S Noguchi (Author) - Forestry Products Research Institute, Japan
Y Tsuboyama (Author) - Forestry Products Research Institute, Japan
Roy C Sidle (Author) - Forestry Products Research Institute, Japan
I Hosoda (Author) - Forestry Products Research Institute, Japan
Publication details: Journal of Forest Research, Vol.2(4), pp.207-215
Publisher: Springer Japan KK
Date published: 1997
DOI: 10.1007/BF02348317
ISSN: 1341-6979; 1341-6979
Organisation Unit: University of the Sunshine Coast, Queensland; Sustainability Research Cluster
Language: English
Record Identifier: 99449310202621
Output Type: Journal article

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