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Author Topic: Douglas Fir Growth in South Oxfordshire
Ken Hume
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Posts: 623
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Post Douglas Fir Growth in South Oxfordshire
on: January 26, 2021, 14:49
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The following article was prepared for publication at the end of 2019 but because it demonstrated that it was not possible to determine whether or not climate change was having an effect on tree growth over a 20 year period the editor choose not to publish it.

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2021 Update

The growth results for 2021 were the best achieved to date.

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If climate change is happening then this would appear to favour growing Douglas Fir in the home counties.

Ken Hume
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Posts: 623
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Post Re: Douglas Fir Growth in South Oxfordshire
on: March 23, 2022, 09:01
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Predicted wind loss outcomes due to climate change (see column 4 in above article) have now come to pass.

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Over winter 21/22 the loss of live Douglas Fir branches has been significant.

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This has not been experienced in this woodland over the past 20+ years.

Ken Hume
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Posts: 623
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Post Re: Douglas Fir Growth in South Oxfordshire
on: April 4, 2022, 08:26
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A DF growth study was undertaken by :-

REUKEMA, D. L., 1965. Seasonal Progress of Radial Growth of Douglas Fir, Western Red Cedar & Red Alder. U.S. Forest Service, Research Paper PNW-26.

Reukema used 20 comparable Douglas Firs in his sample measurement plot i.e. the same as OWG however conducted his study over a shorter 5 year period which is less than OWG's current and ongoing 22 year DF tree growth measurement programme.

Reukema concluded that rainfall amount and seasonal variations in same may cause many of the growth pattern variations observed however the combined relationship effect between rainfall, temperature and wind variables could not be established from the gathered measured data. Reukema's conclusions support OWG's own main inconclusive findings in respect of the annual measured growth of trees reflecting climate change.

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