Sunday, 23 November 2008

Coppice Diary - Autumn 2008

If you visit Hatfield Forest you will almost certainly see areas of woodland which have been managed by coppicing. This way of managing woodland has gone on for thousands of years. Today, it is practised to encourage biodiversity, the act of rotational coppicing ensures that the woodland is always at different states of regeneration which encourages a wide range of different habitats. What evidence can be seen through the year of biodiversity in the coppice? This is what the woodland looks like before coppicing. And the huge increase in biodiversity that results after coppicing. At the beginning of October the National Trust Coppicing Volunteers began work in their area of the forest known as Collins Coppice. Coppicers are not only felling trees but also building 'stockades' around the stumps to protect them against deer browsing. The felled timber is a sustainable source of firewood. At this time of year the leaves are still mostly on the trees and it is a good opportunity to check the regeneration from the stumps cut last season. This Field Maple followed by one years regeneration on a stump of this same species. We expect there to be in excess of 2m growth on Hazel in particular in the first season. This ia an Ash tree which should have been re-coppiced many years ago, if not coppiced it will die, coppicing extends its life indefinitely. Coppicing also gives seeds like these young Oaks a chance germinate.Here are two examples of coppice plants, firstly the twisted stem of the Honeysuckle. And secondly, Beefsteak fungus on an Oak. There is evidence of Badgers and Foxes by their dung pits and scats respectively.

Monday, 10 November 2008

BSNHS Winter Programme 2008- 2009

WINTER PROGRAMME 2008


FRIDAY 26th SEPTEMBER
ESSEX TREES.
An illustrated talk by M. W Hanson.

FRIDAY 10th OCTOBER
FUNGI
An illustrated talk by Mary Smith

FRIDAY 24th OCTOBER
SLUGS and SNAILS
A talk by John Llewellyn Jones

FRIDAY 7th NOVEMBER (to be confirmed)
MICROBIOLOGY
A talk by Dr. Wreghitt.

FRIDAY 21st NOVEMBER
THE IMPACT OF DEER IN THE EAST OF ENGLAND.
A Powerpoint Presentation by David Hooten of the Deer Initiative.

FRIDAY 12th DECEMBER
Members’ Slides and Social Evening


FRIDAY 23rd JANUARY
BADGERS.
An illustrated talk by Bob Reed, Society Chairman

FRIDAY 13th FEBRUARY
PHYLLIS CURRY NATURE RESERVE.
An illustrated talk by Sylvia and Roger Jiggins

FRIDAY 27th FEBRUARY
BAT SURVEYING.
An illustrated talk by Andy Froud and Keith French

FRIDAY 13th MARCH
TALES PLANTS TELL - a look at some interesting plants from around the world.
A talk by Tony Boniface

FRIDAY 27th MARCH
BEES, WASPS and ANTS of ESSEX.
A Powerpoint presentation by Peter Harvey

FRIDAY 24th APRIL
Annual General Meeting and Social Evening

Sawbridgeworth Marsh Nov 2008.

The winter activities on the marsh are now well underway. The peatbank and a couple of plots in the grazing enclosures were cut and cleared during September, the paths recut for the final time this year and the drains lining the boardwalk “brinked” (vegetation bordering the drains cut).
Most of the management tasks on the marsh take place during the winter months, October through to March. One of these is to pollard some of the Crack Willows. The reserve has a large number of these. In order to prevent the branches becoming too long and heavy, with the result that the stock of the tree splits and falls over in strong winds, groups of these willows are recut every five years. By cutting some, but not all, in any 1 year, willows can be seen at various stages of regrowth around the marsh.

Sawbridgeworth Marsh Diary - Autumn Update – 2nd November 2008
Pollarding entails cutting the tree at a height above the ground. Originally, pollarding was carried out in areas where stock were also grazed and cutting at height prevented the animals from browsing the new regrowth. It is, however, difficult and hazardous work and pollarding of most tree species ceased in the early 19th Century. Crack Willows are the notable exception to this and may still commonly be found alongside rivers and fen drains. Three bollings, as the cut trunks are known, were pollarded alongside the backwater over the last couple of weekends. The harvested poles will be used to repair some of the footpaths in the centre of the reserve. By cutting them into short sections and burying them into the peat, the heavily poached paths stabilise and eventually grass grows over the top, hiding the willow poles from view.
New pollards may also be easily started by pushing the poles into the wet ground, where they strike readily. This has been done in Little Valet Homes, where lines of old Crack Willow pollards line a network of old drainage ditches – one of the special landscape features of the reserve. New pollards have been started in the gaps created by the decay and death of a few of the older trees.
A new pond was dug on Little Valet Homes meadow in August. This small meadow was botanically poor, the result of enrichment caused by the dumping of river dredgings in the 1960s. The sward was dominated by rank grasses, Dock, Nettle and Cow Parsley, despite much management effort over the years. A new wet meadow has been created in the next field, Great Valet Homes, on ground that is not enriched and it is hoped that species such as Lady’s Smock, Southern Marsh Orchid and Ragged Robin will eventually colonise this area.

Andrew Sapsford, Marsh Warden.

Sunday, 13 July 2008

Barbastelles and Glow Worms.

On the evening of the 27th June a group of BSNHS members visited the forest to try and locate the rare Barbastelle Bat. We were lucky to make recordings of what I believe is this bat in Spittlemore Coppice. The call is described as ‘ castanet-like smacks at 32kHz’ . We were also very lucky to see Glow Worms in this the same woodland. The following night we could only locate one of the five we had seen the previous evening. Close examination of the photographs showed that it is a mating pair. The female is the glowing one and she stops glowing after mating. Presumably, the males had been busy the previous evening!

Barbastelle Bat.

Sunday, 29 June 2008

Marsh Diary - June. Andy Sapsford, Warden.

As Spring turns slowly to early Summer, so the swathes of Cowslips, Cuckoo Flower and Marsh Marigold that typify the peatbank in April give way to a lush green carpet of Blunt-flowered Rush and smaller, grey-green sedges, such as Carnation Sedge, interspersed with swathes of Southern Marsh Orchid, Ragged Robin and Hay Rattle, for which the reserve is well known.

The peatbank consists of a 5 – 6 feet deep layer of waterlogged peat over gravel and clay. There are a number of springs emanating out of the lower slopes and flushing out into the sedgebeds, helping to maintain their wetness. At some time in the past, attempts were made to drain the peatbank for grazing by digging ditches in line with these springs. The ditches fed into a main drain at the foot of the peatbank and water was carried from this ditch away to the river. Although silted up, the ditches are still very evident, especially in winter. The main drain, being level with the sedgebed, has completely silted up. However, plants such as Yellow Flag Iris, also in flower this month, grow in this more permanently waterlogged environment and plainly mark out the position of the old ditch.

The peatbank is the most botanically rich area of the reserve with a species density of over 50 species per square yard! The presence of this diversity was the main reason that the land was purchased as a nature reserve in 1970 and why it has S.S.S.I status. It is important however, to continually monitor the species composition on the peatbank, both to assess the effectiveness of the management regime and to track any changes due to outside factors, such as pollution or eutrophication by fertilisers. This is carried out at this time of the year, using a technique known as “Rapid Assessment”. The method was developed by Andy may of the Essex Wildlife Trust and allows the warden to monitor the site on a regular basis with minimal effort.
Due to the recent poor weather, butterflies, damselflies and other insects have been thin on the ground lately. With the advent of some warm sunshine at last this morning, however, things are beginning to improve. Red Admiral, Speckled Wood and Small White butterflies and Banded Agrion damselflies were seen on the wing in Little Valet Homes while scything. There have also been good numbers of Reed Bunting, Reed Warbler, Sedge Warbler and Whitethroat this year. A single Willow Warbler was heard calling from the hedge bordering Round Moors. This is the first one I have heard this year on the marsh.

Sunday, 1 June 2008