UKTC Archive

RE: The Pros and Cons of Planting Trees to Address Global Warming

Subject: RE: The Pros and Cons of Planting Trees to Address Global Warming
From: oldoaktree@xxxxxxxxx.net
Date: Mar 23 2020 14:43:24
When doing arcane art of estimating improvement to rooting area of trees by 
adding mulch, I find this to be quite useful.

"A tree of 1000mm diameter adds, on average, 103kg of dry mass each year in a 
northern temperate zone" – Nature  507-90-93 (2014).

You'll have to read the paper to get the ins and outs, but it does give a 
rough perspective of what a well mature tree is likely to put on.

Cheers

Dave

-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info <uktc-request@xxxxxx.tree-care.info> 
On Behalf Of Bill Anderson
Sent: 23 March 2020 13:11
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: Re: The Pros and Cons of Planting Trees to Address Global Warming

Confusing innit?
I seem to see plenty of elderly trees that don't seem to have appreciably 
increased in size during my lifetime. If they haven't increased in size it 
seems to follow that they've not sequestered much carbon. At the same time 
I've seen plenty of newly planted trees increase in size significantly, 
suggesting they've sequestered a lot of carbon. But it's possible I'm only 
seeing a very small part of the very big picture.
I need to read more, perhaps the virus will give me the time....
Bill.

On Mon, 23 Mar 2020 at 11:54, Jerry Ross <trees@xxxxxxxxxx.co.uk> wrote:

Bill -
" for most species mass growth rate increases continuously with tree 
size. Thus, large, old trees do not act simply as senescent carbon 
reservoirs but actively fix large amounts of carbon compared to 
smaller trees; at the extreme, a single big tree can add the same 
amount of carbon to the forest within a year as is contained in an 
entire mid-sized tree."
https://www.nature.com/articles/nature12914

Also,
"A recent study published in Nature
(https://www.nature.com/articles/s41586-018-0577-1 ) "Trade-offs using 
European forest to meet climate objectives" stated that, using 
existing climate models, there was almost zero positive impact on 
global climate whatever the proposed changes in forest management 
(including increasing forest area). Indeed the study found that any 
net increase in conifers made matters worse because conifer canopies 
absorb sunlight (the albedo
effort) so cancelling out the very small and temporary carbon capture 
by their photosynthesis. Indeed the study shows that forest conversion 
from conifer to broad-leaves has a positive impact, so restoration of 
coniferized native woodland can be justified on climate change grounds 
alone."
(Thanks to David Lovelace for that)

Wood pasture is the way to go.
Well actually, abandonment of all of the current widely adopted 
economic models is the way to go.


On 23/03/2020 11:19, Bill Anderson wrote:
This seems a reasonably well-balanced piece Wayne. The only thing 
that raises my hackles slightly is the reference to the benefits 
only arising when the trees are mature. I don't think this is 
completely correct. The Forestry Commission carbon lookup tables 
suggest that through a plantation's lifespan, the rate of greatest 
carbon sequestration is
between
years 5 and 30 (after planting). This seems to suggest we should 
manage
our
forests/woodlands to keep the average age of the individual trees 
relatively young. Their reference to maturity implies that they mean
older
than this, but perhaps I'm misinterpreting what they mean.
Bill.


On Sun, 22 Mar 2020 at 06:10, Wayne Tyson <wt750mv@xxxxxx.com> wrote:

https://www.ecowatch.com/planting-trees-climate-crisis-2645XXXXXX.h
tml

First, I confess to not having read beyond the article. However, I
believe
that your comments will be useful in broadening my understanding of 
the subject.

I look forward to your comments.

Wayne



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