Modelling soil moisture - soil strength relationship of fine-grained upland forest soils

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Uusitalo , J , Ala-Ilomaki , J , Lindeman , H , Toivio , J & Siren , M 2019 , ' Modelling soil moisture - soil strength relationship of fine-grained upland forest soils ' , Silva Fennica , vol. 53 , no. 1 , 10050 . https://doi.org/10.14214/sf.10050

Title: Modelling soil moisture - soil strength relationship of fine-grained upland forest soils
Author: Uusitalo, Jori; Ala-Ilomaki, Jan; Lindeman, Harri; Toivio, Jenny; Siren, Matti
Contributor: University of Helsinki, Doctoral Programme in Sustainable Use of Renewable Natural Resources
University of Helsinki, Department of Forest Sciences
Date: 2019
Language: eng
Number of pages: 16
Belongs to series: Silva Fennica
ISSN: 0037-5330
URI: http://hdl.handle.net/10138/300683
Abstract: The strength of soil is known to be dependent on water content but the relationship is strongly affected by the type of soil. Accurate moisture content - soil strength models will provide forest managers with the improved ability to reduce soil disturbances and increase annual forest machine utilization rates. The aim of this study was to examine soil strength and how it is connected to the physical properties of fine-grained forest soils; and develop models that could be applied in practical forestry to make predictions on rutting induced by forest machines. Field studies were conducted on two separate forests in Southern Finland. The data consisted of parallel measurements of dry soil bulk density (BD), volumetric water content (VWC) and penetration resistance (PR). The model performance was logical, and the results were in harmony with earlier findings. The accuracy of the models created was tested with independent data. The models may be regarded rather trustworthy, since no significant bias was found. Mean absolute error of roughly 20% was found which may be regarded as acceptable taken into account the character of the penetrometer tool. The models can be linked with mobility models predicting either risks of rutting, compaction or rolling resistance.
Subject: 4112 Forestry
cone index
penetration resistance
shear strength
soil bulk density
VWC
PENETRATION RESISTANCE
WATER-CONTENT
CONE INDEX
COMPACTION
DENSITY
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