Updated 06 May 2011
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Planting a new Oak Wood in Dorset
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Progress of Oak Leafing in Plantation.
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The date of onset of leafing of a plantation of 257 related
Quercus robur
saplings in Dorset, England was studied. The results show predictable
temperature dependance when measured against average daily maximum air
temperature for the months of February, March and April.
The oaks were planted from acorn in 2000 AD, with a common mother.
Results show a 50%-leafing on 3 May for 12°C, and an increase of
1°C causing an advance of 5.7 days.
Ground frost at River level (19 m ASL) can scorch or kill young leaves.
Data collected and processed by
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Temperature dependance of leafing.
The "50%-leafed" point was chosen, from a sample of 258, and
date of occurence graphed against Average daily maximum air temperature
over the 3 months (February, March, April) for different years.
Results show 12°C=3 May and an increase of 1°C advances
leafing by 5.7 days. Data is for 258 Quercus robur
(acorns in 2000) in Bear Mead Plantation
in Dorset.
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Average daily maximum air temperature °C
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Month |
2011 |
2010 |
2009 |
2008 |
2007 |
2006 |
Apr |
19.8 |
15.9 |
16.3 |
14.8 |
19.7 |
15.2 |
Mar |
13.2 |
11.3 |
13.2 |
11.7 |
13.3 |
10.0 |
Feb |
10.8 |
7.8 |
9.0 |
10.8 |
10.8 |
7.6 |
Average |
14.7 |
11.6 |
12.9 |
12.4 |
14.6 |
10.9 |
2011 |
2010 |
2009 |
2008 |
2007 |
2006 |
20 apr |
05 may |
24 apr |
02 may |
18 apr |
09 may |
50%=20apr2011 24apr2009 2may2008 18apr2007 9may2006
A4 dead 4may +10 2may 0 17apr -1 11may +2
I8 dead 1may + 7 7may +5 21apr +3 11may +2
J4 3may +13 6may >12 9may +7 29apr +11 17may +8
K3 dead 28apr + 4 2may 0 21apr +3 11may +2
V5 27apr +7 28apr + 4 2may 0 25apr +7 13may +4
W4 27apr +7 4may +10 7may +5 27apr +9 15may +6
Y1 27apr +7 28apr + 4 7may +5 23apr +5 9may 0
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"50%-leafed" date
Av.temp Feb-Mar-Apr |
New leafings per day for different years,
showing temperature-dependance of leafing.
Collection of this data involves walking 15 miles per year.
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20 Apr 2011 14.7°C |
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5 May 2010 11.6°C |
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24 Apr 2009 12.9°C |
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2 May 2008 12.4°C |
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18 Apr 2007 14.6°C |
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9 May 2006 10.8°C |
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Compiled, hand coded and copyright
© 2008, John Palmer,
All Rights Reserved.
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