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The Turkey or Iron Oak - Quercus cerris

The Turkey or Iron Oak – Quercus cerris

by The blog at woodlands.co.uk, 19 June, 2007, 14 comments

The Turkey Oak (or Quercus cerris) is is a fast growing, tough tree; capable of surviving exposure in coastal regions. It was introduced as an ornamental tree into the UK in the eighteenth century,  being native to south east France across to the Balkans and Turkey.   It often has a long straight trunk (or bole), with branches that are somewhat more slender than those seen on English oaks. The leaves are distinctive and different from those of the native oaks (sessile or pedunculate). Whereas the leaf of the latter is quite broad, the leaf of the Turkey Oak is quite narrow and more ‘angular’ (see featured image);  it is also hairy or downy on its lower surface. One of the tree’s distinctive features is the bark, which has orange fissures near to the base of the trunk. Unfortunately, its timber is of little use as it splits and warps during seasoning. [caption id="attachment_37670" align="aligncenter" width="675"] Turkey oak bark[/caption] The Turkey Oak is considered by some to be a "weed species or pest species" because: it is fast growing it will hybridise with the English oak. it is a host to the Knopper Gall wasp Acorns form and mature some 18 months after pollination and are quite large. They may be an orange / brown at the base,  to a green-brown at the tip. The acorn 'cup' is 'hairy' (see image). The galls that form on the tree are abnormal growths.These galls are caused, in this case, by the development of wasp eggs within the plant’s tissues. The wasp (Andricus quercuscalicis) lays eggs in the catkins of the Turkey Oak, these hatch and develop into wasps which in turn lay their eggs in the flowers of the pedunculate oak. The acorns that form are grossly mis-shapen – and are called Knopper Galls. [caption id="attachment_40042" align="alignleft" width="150"] Gall[/caption] [caption id="attachment_40046" align="alignright" width="150"] Gall[/caption]       In some areas there are now systematic attempts to remove Turkey Oak and other non-native species from woodlands and forests.  
Coppicing: An Introduction

Coppicing: An Introduction

by bill, 22 May, 2007, 85 comments

Coppicing is a woodland management method in which the wood from a tree is harvested by cutting a suitable tree near ground level.  It subsequently regrows over a period of years without needing to be replanted. This technique is different from pollarding, in which branches are cut at, or above, head height, leaving the possibility of grazing underneath the growing branches. Coppicing is done on rotation: small areas of a woodland are cut each year in sequence leaving the areas not being cut to grow on for between 15 and 20 years for chestnut, and about 7 years for hazel. When an area of coppice is cut, it is all cut down, and creates a clearing. This periodic coppicing encourages the individual trees to live for up to hundreds of years. If the coppice cycle is managed correctly it can increase biodiversity in the woodland because of the beneficial effects of varying light levels reaching the woodland floor, and the range of different aged trees and stools in the woodland. The best time to coppice chestnut is well after the autumn leaf fall when the sap has gone down, and certainly well before the sap rises in the spring. The basic procedure for coppicing chestnut is as follows: Clear out all leaves and other debris around the base of the stool. Cut and clear away any dead or dying stems. Progressively cut each stem starting with the most accessible sections and working in to the centre of the stool. Ideally one cut should be made about 1-2 inches above where the branch grows out of the stool. That cut should be angled some 15 to 20 degrees from horizontal with the lowest point facing outwards from the centre of the stool. In some cases it maybe necessary to make a first cut higher and then trim back as above. Remember to: Fell away from the wind and fell all the poles in one direction. Make sure you are working upwind of any campfire Always leave a fire in a safe condition when leaving the woodland. Once cut, the poles produced are usually processed to some extent in the woodland: they are often cut to length, and perhaps de-barked. In many cases the coppicer will process further and create spiles (stakes or strong fencing posts), or will split the chestnut into various sizes for fencing. Some even make hurdles for keeping sheep in pens. An approximate guide the diameter of felled coppice for further processing is: Lathes: 1” to 1½” Tree stakes: 1½” to 2” Fencing Stakes: 2” to 3” Straining posts: 4” to 5” Post and Rails for cleaving: 6” to 8” In the UK the main trees that are coppiced are sweet chestnut, hazel and hornbeam. Chestnut has traditionally been used for fencing whereas hazel is more likely to have been used for thatching, hedge-laying spars and hurdle making. Hornbeam was used for charcoal making. Historically chestnut coppice growing has been strongest in the south East of England, especially Kent and East Sussex. Although it is said that the Romans introduced it, there is some evidence that coppicing was practised in England in Neolithic times. There are many areas of the UK where hazel and hornbeam have been grown, but the Midlands and Devon still have much hazel woodland useful for the remaining thatchers.

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