Good afternoon, dear guests and subscribers of the "Build for Myself" channel!
Very often you have to see how, when the level of the site rises, already fairly mature trees begin to dry out. I have come across such situations more than once during construction for sale, when a developer builds an object and raises the site with rubble and black soil, but at the same time tries to maintain the existing landscaping and garden. And the new owner is doomed to see and cut dead wood next summer. In fact, even 15 cm. backfilling with any soil around the trunk is enough for the living trees to dry out in a year.
This is due to the change in the functioning of the aeration of the roots. The tree cannot quickly rebuild its natural functions, thus the absorption of water by the root system is disturbed, and, accordingly, its delivery to the crown. The food system is broken - the tree dries up.
Neither larch, nor spruce and nor pine can withstand a bedding even of 10 cm. since the place of transition from the trunk to the root (root collar) is practically on the soil surface. It is the same with fruit trees such as apple and pear.
There is such an effect of the delayed death of conifers, when, after adding soil, they still stand green for 2-3 years, and then suddenly begin to dry. This is due to the accumulation and redistribution of nutrients in the system. And it may seem to the owners that anything destroyed the tree, but just not an increase in the level of the site.
Even an oak cannot survive for a long time being covered with soil, and after a year the top of the crown will not receive adequate nutrition from the roots.
Of course, there are trees that are not afraid of raising the level of the site, these are poplar and willow. They have a strong survival rate, such crops are able to very quickly put down adventitious roots and provide their crown with the necessary set of nutrients.
Unfortunately, by disrupting the tree's nutritional system, it changes irreversibly. If the bushes can always be dug up by the roots and transplanted, then this cannot be done with a tree, and almost a month after backfilling by 10-20 cm. - the tree is doomed.
When there is a need to raise the level of the site with filled soil, but it is also important to preserve the existing trees, a fence is made:
The fence prevents soil from getting on the neck of the root system, thereby does not change or harm the sap flow. The fence can be either metal or concrete with a diameter of 80-90 cm. and a height equal to the height of the bedding with a margin of +10 cm. The main requirement for it is not to collapse under soil pressure along the entire perimeter.
That's all, I really hope this article was useful to you!
Thanks!
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