Disclaimer: The views and opinions expressed in this article are those of the author and do not necessarily reflect the views of the Arboricultural Association.

Share this story


#ARBatwork #ArbMatters #PledgeLessPlastic & 12 Faces of Arb 1987 storm 2018 3ATC 3ATC UK Open 50th annual AA AA award AA Awards Aboricultural Association Accident accreditation advice AFL aftercare AGM Agrilus Biguttatus aid air quality Alert Alex Kirkley All Party Parliamentary Group on Horticulture amenity Amenity Conference Ancient Tree Forum Annual Awards app APPGHG apprentice apprenticeship Apprenticeships Approved Approved Contractors ARB ARB Approved Contractor ARB Approved Contractors ARB at work ARB Magazine ARB Show arb training ArbAC ArbCamp Arboricultural Association Arboriculture arborists Arbsafe Ash ash dieback Asian Hornet Assessments atf Australia Autumn Review award Awards Barcham Trees Bark Beetle Bartlett Bartlett Tree Experts bats beetle beyond ism Bill Matthews biochar biodiversity biosecurity branch Branches brand Brexit bs5837 bursary business Call for papers Campout Canker stain of plane carbon Cavanagh CCS Cellular Confinement Systems CEnv Ceratocystis Ceratocystis platani chainsaw chalara charity Charles charter Charter for Trees chelsea Chelsea Flower Show Claus Mattheck climate climate change climber climbing Colleges committees competition competiton conference Confor conifers conservation Consultant consultation Contractor Coroner Council Countryside Stewardship Course for beginners cross industry news Crown & Canopy Cryphonectria parasitica Cumbria DART Date for your diary deadwood death defra Design Devon disease document donate dothistroma draft EAC East Anglia ecology Economic Report economy Ecotricity education Electricity England English Elm environment environmental EPF equipment Europe European Arboricultural Council European Wood Pastures exeter Exhibitors Fatal Fatality felling Fellow Fera Field Trip Fine flood flooding Forest Research forestry Forestry Commission forests FSC Fund4Trees funding fundraiser fungal fungi Futurebuild gardening GDPR Geocells Gold Medal Gov.uk government grant grants Green Brexit Green Infrastructure Green Infratructure guidance Guidance Note 2 guides Hazard Tree Health Helliwell Help Henry Kuppen History Honey Brothers Horse Chestnut horticulture horticulturists HortWeek housing HRH HRH Prince Charles HS2 HSE ICF identification industry industry skills Infographic InfraGreen Inspiration Insurance Intermediate Tree Inspection International Urban Forestry Congress Investigating Tree Archaeology Conference Ips typographus Irma irrigation ISA iso i-Tree IUFC Job job opportunity judgement JustGiving Karabiner Kew land-based Landscape Institute Landscape Show landscaping Lantra law Leaf Minor Lectures legal legislation Liability licence London longevity LTOA Magazine maple Mayor of London MBE Melbourne Member Benefit Membership mentor Midlands moth' NASA National Geographic National Tree Safety Group National Tree Week NATO New Year’s Honours News nominations Northern Northumberland notification NTIS NTOA NTOC NTSG oak 'oak Oak Processionary Moth Oak-boring Beetle obituary Observatree occupation opm Padua parks parliament Perennial Pests and Diseases petition photo Phytophthora planning Planning Law planting Plumpton College policy poll Power Preston Twins Prince Charles Prince of Wales processionary prosecution Protect and Survive protected tree protection Qualifications Quotatis ramorum RC Reg Harris Registered Registered Consultant Registered Consultants Rememberance Day renewal Report Rescue research Research grant Resilience response results retrenchment review RFS rhs RHS Chelsea Flower Show Ride for Research Ride4Research rigging Rodney Helliwell rogue tree surgeons RSFS Safety Safety Bulletin Saftey Scotland Scotland Branch Scottish Branch SDG Accord security seminars Share Sheffield Show Sierra Leone Site Guidance skills SocEnv soil soils South East South West SRWP staff statement Stationary Rope statutory STIHL strategy student Student Conference survey Sustainable Soils Alliance Sweet Chestnut sweet chestnut blight T Levels Tatarian maple TDAG technical guide Technical Guides Technical Officers Ted Green tender Thames & Chiltern The Arboricultural Association The Woodland Trust Thinking Arbs Thinking Arbs Day Timbersports Tools top-handled chainsaws,Elcoat, TPBE4 TPO Trading Standards trailblazer training transport Tree Tree Champion Tree Council Tree Fayre Tree Health Tree Inspection tree loss tree management Tree of the year Tree Officer Tree officers Tree Protection tree register tree species Tree Surgeon Tree Surgeons Tree Week Treeconomics tree-felling TreeRadar trees trees' Trees, People and the Built Environment trust' trustee Trustees TrustMark UAG Uitlity UK favourite ukas UKWAS urban urban forest Urban Forestry Urban Tree Cover urban trees Utility Arboriculture Group vacancy VETcert veteran trees video Videos volunteer VTA WAC Wales watering solutions webinars website Western Westonbirt Wharton Witley Women Women in Arb women in arboriculture woodland woodland trust woods World Environment Day Xylella young young arborists Young People’s Breakfast Event zoo

Dead standing trees – to keep or not to keep?

Author:  Marco Bartolini
Last Updated:  13/08/2018
Dead standing trees and woodpecker post

Managing trees is an element of my job (which is the best job in the world) and I am often asked to review standing deadwood, monoliths, erect biomass of standing deadwood – call it what you wish, really, but it amounts to the same thing. For the benefit of this article I will refer to the standing tree as a monolith. I appreciate that this is a term used for an upright, man-made stone structure, but for simplicity I shall use it here.

I have carried out research on how we should manage these dead standing trees. I have contacted knowledgeable people in the industry, the Forestry Commission and other such notable government departments dealing with trees. The answers are all relatively simple: keep an eye on them. That is the simplistic view and not one that can carry much weight in litigation ‘Yes, gov, been keeping an eye on that but … well, it just fell over in the night.’

Why keep a monolith anyway?

I have seen first-hand that a monolith can provide a habitat for mammals, small birds, reptiles and invertebrates and food for detritivores in abundance. The height of a monolith can also dictate what will occupy the spaces provided by its demise. The height can be compared with a habitat woodpile, where reptiles and land-based animals will move in. High deadwood can attract flying animals, and so there is a distinct habitat structure to consider.

In relation to a fell, if the location is favourable, and with the tree owner’s consent, I will always prescribe a monolith as a wildlife habitat. It is an opportunity for me to promote the environmental benefits, along with encouraging the public to take responsibility for enhancing their surroundings in ecological terms.

When choosing a height to reduce the tree to in order to create a monolith, I consider primary limb attachment and length (should they be reduced towards the stem to balance the monolith?), diameter of the stem, root flare and most importantly the target. Generally, I reduce the stem height to between 4m and 8m above ground level in the first instance. I must take into account how further work will be carried out if the monolith needs it, if it is isolated and a climber or mobile elevated working platform (MEWP) is required, for example.

Climbing post for a vine
Footpath marker post

Inspecting a monolith

So, should we keep a record of inspections or merely walk past the monolith in the hope that it will either stand there forever or someone will fell it and the problem will be removed? It has always been my stance that the monolith should be included within a Visual Tree Assessment or Target Inspection Report.

A habitat for trees and a formal garden feature

The target will definitely prescribe the frequency of inspection, but there are ways in which the knowledgeable tree inspector can make further assessments of the longevity of the monolith. A 3mm diameter drill-bit, 30cm long is in my ‘tool kit’. Scraping away the upper soil level around the tree will often locate its structural roots, including the buttress and root flare. It must be remembered that the root crown consists of stronger wood, often twisted with grain, and so will rot slower than that of other roots. Confirming root connection to the root crown will determine if the tree is going to stand upright (or not). Consider the Victorian stumpery – the tree and lateral roots had long since rotted! By using the drill (much like a resistograph) I can feel resistance or otherwise. If the roots provide me with sufficient evidence that they are intact I then consider soil structure. From sand to clay, the tree will react differently to wind-loading, topography and hydrology. Therefore, I must consider these factors before making my final decision to retain or remove.

In addition to drilling, a further investigation of sound wood is carried out using a trusty 30-ounce Thor 408 Hammer. The hammer sounding can tell you quite a lot about the tree and it enables the user to form a picture of what is happening inside it, the size of a cavity or where the flaw may lie.

I have not found any hard and fast rules about monolith retention and possibly this could be included in the forthcoming amendment of the National Tree Safety Group guidelines of 2011.

The images in this article show some of the trees I have inspected or continue to monitor as part of my ongoing tree assessment regime.

Marco Bartolini joined the army at 17 and resigned 31 years later after a career that culminated in being presented with the Meritorious Service Medal. School friends joked that he was going to count trees on Dartmoor: `Many decades later I am now not only counting but surveying, inspecting, advising, giving talks about and researching trees. I have been practising environmental work since 2006 and as a consultant since 2011. I am also an avid ecologist with a number of NE licences.’

Article taken from Issue 182 of the ARB Magazine.