Abstract
In order to establish methods for and extent of determinations of the amount of remaining tree residues, a pilot study was made of a specific area. Here we laid out 1 m{sup 2} plots and found that in 65 of 70 test plots the divergence from the mean value was 16% at 67% probability, corresponding to 31% at 91% probability, which was acceptable to our principal. The main study, on three areas, was conducted as fresh brush removal where no `needles` had fallen off. The removal varied between 30-40 tonnes of dry matter per hectare. On the area with the most favourable logging conditions and the largest share of spruce, 24% of the total amount of tree residues were left. With a reduced share of spruce and more difficult logging conditions, the share of remaining tree residues increased to 31 and 34% on the two other areas. In the main study, the same statistical significance was obtained as the pilot study. In one area, the theoretical amount of remaining tree residues was calculated under the assumption that the needles had been allowed to fall off before forwarding. The result showed that the remaining share increased from 32% to 52%. Here,
More>>
Citation Formats
Eriksson, L G.
Amount of tree residues following harvesting of wood fuel; Maengd traedrester efter traedbraensleskoerd.
Sweden: N. p.,
1994.
Web.
Eriksson, L G.
Amount of tree residues following harvesting of wood fuel; Maengd traedrester efter traedbraensleskoerd.
Sweden.
Eriksson, L G.
1994.
"Amount of tree residues following harvesting of wood fuel; Maengd traedrester efter traedbraensleskoerd."
Sweden.
@misc{etde_10105785,
title = {Amount of tree residues following harvesting of wood fuel; Maengd traedrester efter traedbraensleskoerd}
author = {Eriksson, L G}
abstractNote = {In order to establish methods for and extent of determinations of the amount of remaining tree residues, a pilot study was made of a specific area. Here we laid out 1 m{sup 2} plots and found that in 65 of 70 test plots the divergence from the mean value was 16% at 67% probability, corresponding to 31% at 91% probability, which was acceptable to our principal. The main study, on three areas, was conducted as fresh brush removal where no `needles` had fallen off. The removal varied between 30-40 tonnes of dry matter per hectare. On the area with the most favourable logging conditions and the largest share of spruce, 24% of the total amount of tree residues were left. With a reduced share of spruce and more difficult logging conditions, the share of remaining tree residues increased to 31 and 34% on the two other areas. In the main study, the same statistical significance was obtained as the pilot study. In one area, the theoretical amount of remaining tree residues was calculated under the assumption that the needles had been allowed to fall off before forwarding. The result showed that the remaining share increased from 32% to 52%. Here, thus, the needles were theoretically 18% of the total amount of tree residues. The tree residues left were unevenly spread over the felling areas, which resulted in a large divergence from the mean value of the test areas. Tree residues that were between 2 and 5 cm thick occurred with between 12 and 17%, and those larger than 5 cm between 6 and 8% of the total amount of remaining tree residues. 3 refs, 10 figs, 5 tabs}
place = {Sweden}
year = {1994}
month = {Aug}
}
title = {Amount of tree residues following harvesting of wood fuel; Maengd traedrester efter traedbraensleskoerd}
author = {Eriksson, L G}
abstractNote = {In order to establish methods for and extent of determinations of the amount of remaining tree residues, a pilot study was made of a specific area. Here we laid out 1 m{sup 2} plots and found that in 65 of 70 test plots the divergence from the mean value was 16% at 67% probability, corresponding to 31% at 91% probability, which was acceptable to our principal. The main study, on three areas, was conducted as fresh brush removal where no `needles` had fallen off. The removal varied between 30-40 tonnes of dry matter per hectare. On the area with the most favourable logging conditions and the largest share of spruce, 24% of the total amount of tree residues were left. With a reduced share of spruce and more difficult logging conditions, the share of remaining tree residues increased to 31 and 34% on the two other areas. In the main study, the same statistical significance was obtained as the pilot study. In one area, the theoretical amount of remaining tree residues was calculated under the assumption that the needles had been allowed to fall off before forwarding. The result showed that the remaining share increased from 32% to 52%. Here, thus, the needles were theoretically 18% of the total amount of tree residues. The tree residues left were unevenly spread over the felling areas, which resulted in a large divergence from the mean value of the test areas. Tree residues that were between 2 and 5 cm thick occurred with between 12 and 17%, and those larger than 5 cm between 6 and 8% of the total amount of remaining tree residues. 3 refs, 10 figs, 5 tabs}
place = {Sweden}
year = {1994}
month = {Aug}
}