Название: Rewilding
Автор: David Woodfall
Издательство: HarperCollins
Жанр: Биология
isbn: 9780008300487
isbn:
In 2016, a land-purchase opportunity led to a successful funding bid by a partnership of Natural England, NRW and SWT for the five-year, €7-million European and Heritage Lottery-funded Marches Mosses BogLIFE Project, which aims to make a step change in the rate of rewilding of the Mosses.
Importantly, the project addresses a problem affecting all British raised mires – the loss of our mire-edge ‘lagg’ (fen, carr and swamp communities), whose high-water table sustains the water table in the mire’s central expanse. Restoring the lagg involves buying marginal forests and woodland and clearing their smothering trees, buying fields, disconnecting their under-drainage, stripping their turf and reseeding with mire species. A new technique of linear cell damming or ‘bunding’ the peat then restores water levels. Lagg streams, canalised within the peat during the Enclosure Awards, to lower marginal water tables, will be moved back to the bog’s margin, so peats can be hydrologically re-united. And all without affecting our neighbours!
The project also involves adjusting dams on the central mire areas and bunding peats which haven’t got a cutting pattern to dam. The project even addresses clearing up the scrapyard and beginning to tackle the problem which is affecting most nature conservation sites nationally – high levels of aerial nitrogen pollution and, at the Moss, its consequent high coverage of purple moor-grass.
So why bother with this mammoth struggle on such a damaged peatland? In the 1980s, the main driver was biodiversity – its unusual bog wildlife, its cranberries, all three British sundew species, lesser bladderwort, white-beaked sedge, its raft spiders, large heath butterflies and moth communities, including Manchester treble-bar, silvery arches and argent and sable moth. Despite its devastation, this huge site provided corners for rare wildlife to hide in, waiting for the restoration of mire water tables. Today crucial bog-mosses have recolonised central areas and flagship species like the white-faced darter have been dragged back from the brink of extinction. Now, in spring, rare mire picture-winged species like Idioptera linnei dominate the cranefly community and the mire spider community is breaking national records. Regularly, invertebrate species, often new to either countries or counties, like micro-moth Ancyllis tineana, emerge from hiding, and the wetland bird community now is of national importance.
But today the driver for rewilding the Mosses is also restoration of the ecosystem services provided by a functioning bog – regulation of water quality and flow (particularly important with increasingly frequent flood events), re-pickling the bog’s vast carbon stores so their release doesn’t add to climate change and encouraging future carbon sequestration.
The growing pride for the restored Mosses in the local community and the increasing numbers of visitors from far afield, boosting the local economy, are a testament to the success of rewilding this quagmire and will be helped by further sensitive provision through the BogLIFE Project.
Wading through knee-high bog-moss on Clara Bog in central Ireland some years ago, brought home to me the potential resilience of bogs and their capacity to regenerate themselves after damage. The bog was acting like a giant shape-shifting amoeba: localised marginal drainage for domestic peatcutting had made the crown of the bog dome move, channelling more water and nutrients to a shrunken area, accelerating the accumulation of bog-moss and ultimately restoring the bog’s profile. Even at our devastated Marches Mosses, particularly with the challenges of climate change, the only viable option for the landscape seems to be a return to functioning raised bog. The bog is shrinking towards the lowered water table set by Enclosure Act culverts, making other land uses progressively less economically viable. Now forests fall down, marginal fields flood and pumping costs have become more expensive and cause further peat shrinkage.
Now, like at Fenn’s and Whixall, it is the time to capitalise on these devastating consequences of past drainage, to be bold, to grasp opportunities and to rewild our wetlands and regain their age-long benefits for all of us.
Curlew in flight.
Rewilding site, Kielderhead Nature Reserve.
Kielder wildwood is a wilding project with an especially big ambition. It is a woodland restoration and creation project in its own right, but is also conceived as a means to a much greater goal – that of integrating degrees of restored natural processes across the vast landscape of forest and open land between Whitelee Moor on the Scottish border and the whole of the wider Kielder Forest and Water Park landscape. Indeed, the wider vision is to extend this wilding approach across the Scottish border and to complement the already largely rewilded Border Mires – one of the largest restored peatscapes in England.
Thus, we are working with our partner landowners the Forestry Commission and Kielderhead (cross-border) Committee and others, to make all of the area wilder by degrees, recognising that even within the commercial forestry areas, there are already integrated wild lands, such as impressive riparian corridors. If nothing else, this Kielderhead wildwood concept is ambitious and certainly landscape-scale – more a ‘future proofing’, area-wide approach, than a mere project.
Part of the vision is very much about creating a ‘forest for the future’, a more natural, open montane woodland of mainly native species, with a more complete ecosystem over the longer term. Initially, this will focus on a 94 ha area of the Scaup Burn valley, which will be planted with 39,000 trees over three seasons, all by volunteers.
We recognise we are starting not in prehistory but in the twenty-first century, in a commercially important, working forest context and we have reasonable acceptance of this in species-mix selection, management and establishment techniques.
This vast area of open land runs for over 8,000 ha up to the Scottish border. Today many of the hillsides beyond where plantation forest is still maintained are devoid of trees and, because the blanket bogs on top of the moors are important open landscapes in themselves, tree cover is actively discouraged. Large areas have special conservation designations to protect their special habitats and species, though often such land has the marks of human interference, being prepared long ago for possible forestry use.
The idea is to create ‘future-scape wildwood’, which has elements of species and habitat that thrived in prehistoric times here when the ecosystem was more complete. We aim to plant locally appropriate species such as downy birch and rowan, willow (some of which is already recolonising areas), juniper and many other species.
People are closely involved, despite the area’s remoteness. We started gathering local seed early on, including from rare old pines, growing seedlings with a view to planting to local seed stock. We draw additional inspiration from historic and prehistoric perspectives locally.
One key feature is a group of old Scots pines, the ‘William’s Cleugh Pines’, long thought be possible remnants of ancient or even prehistoric lineage – if true, they would constitute the first confirmed specimens of native English Scots pine.
Genetic work that has been carried out is inconclusive, but nevertheless the possibility remains of Scots pine being a surviving component of prehistoric forests. Evidence of the ancient forests is seen in the peat beds underlying the site and exposed in banksides and the burn – a layer of horizontal forest dated to 7000 bce, including pollen and preserved evidence of pine.
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