Pirkanmaa region is strong by her Carbon husbandry


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Development of the land area of Sink Forests in Finland since 1921

Kuva
The definition of Forestry land in Finland is based on the volume growth of existing, living trees in the selected area - or on the potential volume growth in same area if there has been for instance a temporary forest clear cut in the area. In the standard silviculture the area is waiting for replanting or for natural recovery, in a few (less than 10) years. The Forestry land has been divided into four categories (Figure 1). First, when the average volume growth (stems only) is more than one solid cubic meter per hectare per annum, the land area is called Forest land. Second, when the average volume growth is between 0.1 - 1.0 m3/ha/a the land area is called Poorly productive forest land. Third, when the average growth is less than 0.1 m3/ha/a the land area is still included in the main category of forestry land but it has been nominated as Unproductive (forest) land. Fourth, under the main Forestry category there is still a minimal forestry land class called Forest roads and depots....
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Dry biomass and the annual biomass growth in Finnish forests since 1921

Kuva
In the Carbon husbandry with trees, and forests in general, it is logical to add the treetop, the branches (including the foliage) and the roots into the stock of the solid stems. The total biomass is most logical to estimate in dry tons. The basic measurement also for Sink Forests is in the stems, as solid cubic meters in one stem, or solid cubic meters per one hectare.   Picture 1. Cubic meters easily measurerable in Scots pine forest in South Finland (Kiikala) In the Finnish forest inventory series between 1921 - 2019 the total  biomass stock (in dry tons)  has been measured three times for the periods NFI 11 (2009-2013), NFI 12 (2014-2018) and NFI 12/13 (2015-2019). With normal statistical sampling plots this was done together with the normal solid cubic meters inventory. Picture 2. Shares of solid cubic meters in tree classes in the  three last Forest inventories (NFI 11 - NFI 13). The Finnish forests are typically coniferous forests. They cover 80 pe...
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Forest Carbon number and Forest Carbon flux, per forest hectare, at national level, in Finland since 1921

Kuva
Forest carbon number for a special year tells how many tons of elementary Carbon there is per forest hectare. The Carbon is stored in the trees, including the solid stems, the branches, the foliage and the roots. Forest carbon number can be calculated at various categories level like at farm forest level, at regional forests level, at national forests level and at global forests level. Forest carbon number (fc) is calculated by dividing the total carbon stock (c, tn C) at certain time point (t, years) by the forest land area (fl, hectares) over the selected category. (1)      fc(t) = c(t) / fl(t) At Finnish national level the Carbon stock (c) equation is (2)     c(t) = 0.06460  * t^2 - 250.40 * t + 243136 Consequently, the forest land (fl) equation is (3)     fl(t) = -0.006073 * t + 38.46 The development of forest carbon number (fc, equation 1) for Finnish forests is shown in Figure 1. Figure 1. Development of Forest car...
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