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1999-05-01
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eopr-4315.pdf
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Mulqueen, J., McHale, J., Rodgers, M., Reducing windthrow losses in Farm Forestry, End of Project Reports, Teagasc, 1999.
Abstract
The study comprised a field and laboratory investigation on the stability of
Sitka spruce trees planted on a surface water gley.
The field-testing was conducted at Ballyfarnon Forest in County Sligo in the
north west of Ireland. Nine destructive monotonic pulling tests were
conducted on trees selected from three different site preparations, namely,
mole drained, double mouldboard ploughed and an uncultivated control.
Dynamic testing, using a mechanical rocking device, was performed on a
tree selected from the uncultivated control.
A simple shear apparatus was used to conduct monotonic and cyclic tests on
reconstituted samples of the Ballyfarnon soil. This allowed a comparison of
soil behaviour under monotonic and cyclic loading.
A computer software package was used to model the behaviour of
groundwater for soil mole drained at two drain spacings. Results from this
mathematical modeling were compared to experimental data gathered
during a previous study.
Results indicate that the use of mole drainage as a site preparation technique
produces more stable trees than either double mouldboard ploughing or no
cultivation.