Jul 08 2013

Burning Lessons

Published by at 9:50 am under Expeditions and Experiences

For several years I have been experimenting quite a bit with burning of lands to add variation, stability and abundance. The results are still far from conclusive as several of the sites takes a number of years to recover from a burn. Some lessons can be drawn already though and I’m presenting these here.

Burning blueberry undergrowth (or other brush berries), which makes for a substantial portion of the area here, seems to have less advantage unless there has been a mass death of the undergrowth. This happens with long intervals only, most places the bushes seem to produce steadily for 10-20 years before they die. At this time it might be beneficial to burn them in order to rejuvenate them.

A fairly superficial burn seems to stimulate the roots of many species so that they’ll sprout very vigorously the next year. This seems to hold true for most grasses and decideous bushes and trees. Conifers are negatively affected, unless the tree is limbed to above the hight of the flames before you set fire to the ground. These pictures show patches of blueberry, bilberry and cowberry in different stages of regeneration after a burn.

emergingblueberries burntmound

To my surprise, grassy areas on peat moss, doesn’t seem to be as positively affected by burning every year as I thought. The burning does kill the spaghnum moss, which increases the area where grass is produced, but the grass seems to be slow to colonize those new patches. 3 years of burning does not seem to be enough to have grass take over for the moss, but I’ll keep on burning a patch every year to see how it develops. Reason why I want the peat moss to shift to grass is to increase forage for herbivores. Peat moss is super abundant here in any case, so I want to shift the proportions to more grass. Very few species eat peat moss.

Burning a patch every year, or even every few years will of course also keep trees from colonizing the patch, only grass and herbs will survive. This is the patch that has been burnt three years in a row (but not this spring).

severalyearsburnt

I set fire to several acres down by a lake last years, which killed off nearly all of the small birch in the area. This way I caused a setback to the regrowth of beaver feed, which I regret, but on the positive side it killed off nearly all the small spruces and pines which would eventually have outcompeted the birches. My lesson from this though is that I’ll only burn such an area only right after the beaver has logged there extensively to remove the leftovers from their work and to encourage regrowth. Game also avoid crowded, brancy places as there is not much food to find and walking there is a pain in the behind.

The most successful experiment has been in burning dry grass fields on a pretty large scale, and also inside forests with grass as the undergrowth. Dead grass is removed and the grass looks greener and grows thicker.

Some plants I have observed to be positively affected by burning:

  • Valeriana sambucifolia
  • Wild Angelica (Angelica sylvestris)
  • Cloudberry (Rubus chamaemorus). Seems to be positively affected if the burning is done only with very long intervals, since they seem to benefit from the reduction of peat moss and heather. Whether they produce more berries after burning, I have not yet been able to conclude upon.
  • Cotton grass (Eriophorum sp.)

cottongrass cloudberries

It is worth noting that fire killed trees makes for an excellent source of firewood and a large fire can provide you with an abundance for several years. The photo is a bad example, but gives you an idea.

burntspruce

Woods I manage such as to always¬†leave the biggest trees. Take the majority of the smallest trees and burn them in heaps, but leave the nicest ones. Use some of the medium sized trees for timber, especially spruce, which in abundance can cause intense shade in the undergrowth to the exclusion of groundcover production and other species of trees. They also negatively affect the quality of the bark of birches. If several larger trees crowd a place I make decision based on whether there is a need for some cover for the animals there and if I need the timber. No matter how small in growth, I always clear around rarer species to promote variety. This goes also if I discover a patch of edible plants of any kind, I’ll make their conditions more favourable in any way I can. I also generally limb the trees to above my head to make it easier to move about, but leave some spruces unbranched here and there for game cover. The key is to allow for enough shade to keep young trees from developing in the undergrowth, while allowing enough light to keep grass, herbs and some brush growing in the undercover. This will make for the most productive and beautiful forest I believe.

The worst thing you can do with a forest is to cut it all down at once and not follow it up. It will then take at least 3 times as long to get a nice, productive forest for you and the animals than if you tend it sporadically. That said, variety should come in all aspects, so some places should be allowed to be thick and regenerate on their own. Some places should even be thick spruce forest. These habitats play crucial roles as cover for animals, but aren’t very productive and should because of this be limited in size and frequency.

Regards
Torjus

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4 responses so far

4 Responses to “Burning Lessons”

  1. Maton 25 Jul 2013 at 6:16 am

    Thanks for posting this, there isn’t a whole lot of info out there on this topic(for boreal forest anyways). Perhaps i need to purchase the Edible forest garden book.

    In my neck of the woods, there are many areas that are overage aspen and rather thick undegrowth of alder, hazelnut, chockecherry and saskatoon. Very difficult to walk through… I don’t think such areas provide much food for the deer either, because they seem to prefer to feed in ditches and farmers fields.

    Some patches of hazelnuts produce rather well though, especially on a south facing bank of the river. There are many acres of this stuff throughout the forest.

    Chochockecherry and saskatoon do not produce well at all. Probably due to old age and shady conditions. Finger thick saskatoon are usually around ten years old, and I’ve counted over 20 growth rings on some. Cherry does not grow much faster under the conditions.

    Places where they have done logging for pine are different story. large number of berries – blueberry, raspberry, strawberry and saskatoons. Saskatoons grow on very small bushes, but provide large numbers of berries. In aspen forests tall saskatoon shrubs provide almost none.
    Black bears often occupy these logged over areas, along with deer coyotes etc.

    Sorry for a long comment on an almost unrelated topic, but I thought Id share some thoughts on local ecology.

    Mat

  2. Torjus Gaarenon 25 Jul 2013 at 10:36 am

    Mat

    Your observations are interesting, it’s the same here. Clearcutting on a small scale is not bad at all. What is bad is when the place is planted with conifers or other trees that will shade out the undergrowth afterwards. The natural regeneration goes towards variety, although too dense. Thinning the forest would help quite a bit probably.

    Better yet though, I believe, is if one can keep a relatively stable system with a lot of edge zones. Burning large spaces of open ground and the undercover of savanna type forests is probably one of the best ways to increase production favourable for human consumption. It is good to also cycle some areas though, to provide feed for animals like moose and beaver.

  3. Maton 25 Jul 2013 at 2:57 pm

    Torjus

    I know of one area that has been logged with natural regeneration in mind. They leave patches of trees of different sizes to imitate forest fires, with no replanting done. Out of 4000 hectares 2700 have been logged I believe the sign says. Variety is definitely present, and they young forest is very thick. Aspen is definitely the dominant species. At this point the young trees are around 1-2 inches.

    Moose seem to like the area, their sign is present everywhere. Besides food they also have easy travel on the bush logging roads, often snowmobile packed in the winter. Predators ofcourse are present as well.

    Thinning this forest would be interesting, but might be too much work for a hunting and gatherig group.

  4. Torjus Gaarenon 26 Jul 2013 at 9:17 pm

    You are probably right that hunter gatherer groups didn’t have time to micro-manage their envirionments. At least in most cases. I think keeping most relatively flat ground as grassland, periodically burned brushland or savanna is the easiest approach. Maybe allow natural regeneration to go rampant along lakes and streams to increase food for beavers and winter feed for moose. And then simply burn over places the beaver has virtually exhausted and start the cycle again.

    Steep slopes I’d mainly keep as dense canopy “natural” forests, since they’re more dangerous to burn.

    I can recommend the books “Tending The Wild” and “Keeping It Living” as well as a booklet called “A Time For Burning”.

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