Drought stress including to problem of caring for Sherwood Forest’s iconic Main Oak
Pioneering strategies and expertise are being utilized by Britain’s largest conservation charity to ship bespoke care to one of many nation’s most well-known and beloved timber.
However the current heatwave is bringing an extra problem as makes an attempt proceed to deal with advanced points affecting the tree’s well being.
The Royal Society for the Safety of Birds (RSPB) is working intently with a number of the UK’s main tree and soil well being specialists to assist the Main Oak, in Sherwood Forest, Nottinghamshire.
The tree, estimated to be round 1,000 years outdated, has an extended affiliation with the legend of Robin Hood and his band of outlaws, and is reputed to have been a hiding place for them within the forest.
Over the previous 200 years, tens of millions of tourists from all around the world have travelled to Sherwood to admire the Main Oak.
However its recognition has contributed to compaction of the sandy acidic soil round its base, attributable to many years of individuals strolling – and even driving and driving – as much as the tree till the set up of a fence within the mid-Nineteen Seventies.
The fence helped to ease stress on the soil, however not the continued risk to its well being because of the compaction, which has continued to limit the stream of water, oxygen, and the provision of vitamins to the tree’s roots.
As well as, current ‘ground-truthing’ of a subterranean root radar survey, which had estimated the extent of tree’s root system, has found the alarming actuality of a much-reduced community of roots in poor situation.
Evaluation of the roots has revealed an absence of significant interplay with fungi and different organisms.
In 2023, the charity started a phased root restoration programme, accepted by Pure England, the federal government’s regulatory company for the pure surroundings, with the intention of sustaining the Main Oak for so long as attainable.
However the warmest June ever recorded within the UK and weeks with out important rainfall in 2025 have added to the urgency of the work already being executed for the tree to reverse the impression of compaction.
A watering system has been usually deployed by employees on the reserve in current weeks, in response to info offered by expertise measuring moisture within the soil.
Hollie Drake, RSPB Senior Web site Supervisor for Sherwood Forest, stated: “The accountability of caring for such an iconic tree is a large privilege, however additionally it is a big problem.
The Main Oak has an unrivalled cultural heritage and means a lot to our neighborhood and the county of Nottinghamshire, fairly other than its immense worth to nature right here at Sherwood.
We all know there may be very robust feeling and emotion generated by the tree, and lots of 1000’s of individuals world wide can be to know the way it’s doing. Our employees and volunteers completely share that deep affection.”
Chloe Ryder, Property Operations Supervisor for the RSPB at Sherwood Forest, who has been main the work, defined: “One in all our aims for the a whole bunch of Historical oaks right here at Sherwood Forest is to maintain them residing for so long as we presumably can, whereas creating optimum situations for youthful oaks to stay nicely into their Historical and Veteran phases.
For the Main Oak particularly, we’ve been sourcing the very best accessible scientific recommendation and proof from tree and soil well being specialists to ship a plan to boost the well being of the tree, if that’s even attainable at this stage.
However this appreciable activity shouldn’t be made any simpler by local weather change.
We will already see that local weather change is having a devastating impact on the pure world, and the warning from the Met Workplace that excessive climate is the ‘new regular’ for the UK provides us actual trigger for concern.
The Main Oak has skilled three consecutive summers with extended durations of drought throughout its rising season, and unprecedented excessive temperatures of 40oC in 2022.
This 12 months, as soon as once more, its leaf protection demonstrates the huge stress that the tree is beneath. A tree this outdated, with such a posh historical past, faces gargantuan challenges as it’s, that are being regularly exacerbated by very popular and really dry summers.”
Other than serving to the tree deal with the impact of drought, the RSPB had already begun to deal with the difficulty of soil compaction round its base.
Through the previous two winters, RSPB employees and volunteers, working with Hampshire-based soil well being company SoilBioLab, have been painstakingly breaking apart the tightly packed soil from round sections of the tree’s compromised roots.
Natural materials gathered from throughout the forest is added to feed the soil and stimulate organic exercise earlier than the earth is changed over the roots. The work is all executed by hand to minimise the danger of any harm to the tree.
As a part of the foundation restoration work, vegetation throughout the Main Oak’s fenced enclosure is being left to finish its full progress cycle. Established crops will assist to naturally break up the soil, in addition to to extend biodiversity and ecological complexity across the tree.
Grasses and different crops will retain moisture, switch vitamins, and appeal to pollinating bugs. Decaying wooden, which is integral to the ecosystem of Sherwood, can also be getting used to attempt to improve organic exercise within the soil.
A younger oak tree, felled for conservation causes, has been laid within the enclosure to decay over time, releasing very important vitamins into the bottom because it breaks down and gives a habitat for a wide range of wildlife, together with the uncommon saproxylic invertebrates which have earned the forest its protected standing as a Web site of Particular Scientific Curiosity since 1954.
Monitoring the outcomes of the work is significant to the result of the programme, so the charity has trialled soil sensors to verify temperature and moisture content material within the floor.
Information from these gadgets is offered in actual time, serving to to tell the administration of the tree.
In partnership with the Woodland Belief and Dr Andy Hirons, a Senior Lecturer in Arboriculture at College Centre Myerscough, the RSPB has connected dendrometers to the tree to measure its progress and shrinkage relative to water uptake.
Louise Hackett, Treescape Improvement Lead for Sherwood on the Woodland Belief, stated: “The dendrometers are offering distinctive and real-time details about the situation of the Main Oak and the way it’s responding to challenges, such because the lengthy dry spells we’re presently experiencing, in addition to to the efforts being made to assist it deal with these challenges.
Every little thing we’re studying from the Main Oak proper now could be furthering our understanding of historical timber, which is able to assist us to guard different historical and veteran timber sooner or later.”
Hollie Drake stated: “Whereas nobody can definitively say how lengthy it’ll proceed to stay, the Main Oak will stay standing within the coronary heart of Sherwood and endlessly be a part of the legend of Robin Hood.”
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