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: Jerry Ross
Date: Mar 23 2020 11:54:22
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.html

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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