Diss. (sammanfattning) Alnarp : Sveriges lantbruksuniversitet, 2005. / Härtill 4 uppsatser.

Diss. (sammanfattning). Umeå : Sveriges lantbruksuniv., 2003. / Härtill 5 uppsatser.

Diss. (sammanfattning). Umeå : Sveriges lantbruksuniv., 2004. / Härtill 4 uppsatser.

Diss. (sammanfattning). Uppsala : Sveriges lantbruksuniversitet, 2005. / Härtill 5 uppsatser.

Diss. (sammanfattning). Umeå : Sveriges lantbruksuniversitet, 2005. / Härtill 4 uppsatser.

Diss. (sammanfattning) Umeå : Sveriges lantbruksuniv., 2006. / Härtill 5 uppsatser.

Swedish forest takes up and stores 60 million tons of CO2 every year. Which is a great climate benefit. Fertilization of forest results in a growth increase beacuse of the added nutrients supplied to the trees. This leads to an increased amount of needles that can produce a higher photosynthesis. The purpose of this report has been to examine the possibility of growth increase of norway spruce (Picea abies) with frequency fertilization in young stands. Earlier studies have shown that this is an efficient way to increase the stemwood production. The study has one hypothes, the growth increase in frequency fertilized young stands results in a yearly growth increase of 10 m3 per hectare compared to unfertilized stands. The material of this study is prepared from assessments from trials in Tranemo and Toftaholm in southern Sweden. The results have been compared to data from earlier assessments in the trial stands. Tranemo and Toftaholm is fertilized six times since 2003. The fertilizer dose is optimized after a needle analysis before every fertilizing occasion. The results show that the volume, diameter, basal area and individual stem volume is higher in the fertilized areas than in the unfertilized areas for both Toftaholm and Tranemo. The growth increase at the fertilized areas has increased significant compared with the unfertilized areas. The growth increase at the fertilized areas is 24-25m3 per hectare and year. The growth increase at the unfertilized areas is about 15m3 per hectare and year. Fertilization of young stands results in a high growth and shortens the rotation period considerably, the trees reach higher dimensions in shorter time. This study indicates that the number of stems per hectare has an impact on the growth increase in fertilized stands.

The graduation thesis is described economical valuation of production hey. There is described methods and condition of measure consumption a fuel of energetic vehicle and working set and demand of time for provide sinlge technologic operation of harvest. The measure value was used for assesment a general straight cost on the produciton of hey. In the next point is described technologic procedure of pruduction hey and structure technologic line. The one part of graueted thesis is analysis of using areas of perennial grass stands and their characteristic.

In recent years, the tech is moving towards a more automized and smarter software. To achieve smarter software the implementation of AI is a step towards that goal. The forest industry needs to become more automized and decrease the manual labor. Decreasing manual labor will both have a positive impact on both the cost and the environment. After doing a literature study the conclusion was to use Mask R-CNN to be able to make the AI learn about the pattern of the different stands. The different stands were extracted and masked for the Mask R-CNN. First there was a comparison between the usage of a computer versus Google Colab, and the results show that Google Colab did deliver the results a little faster than on the computer. Using a smaller area with fewer stands gave a better result and decreased the risk of the algorithm crashing. Using 42 areas with about 10 stands in each gave better results than using one big area with 3248 stands. Using 42 areas gave the result of an average IoU of 42%. Comparing this to 6 areas with about 10 stands each gave the result of 28% IoU. The result of increasing the data split to 70/30 did gave the best IoU with the value of 47%.

Increasingly homogenous forest landscapes, with fewer occurrences of wildfires, deciduous trees and dying, decaying wood has led to fewer appropriate habitats and feeding opportunities for several forest dwelling species, including birds. This study sought to assess the species richness, diversity, and evenness of winterbirds in forest stands where conservation methods (planting of alder trees, free development, burning of forest stands and promotion of deciduous dominance) have been applied, as well as a managed stand of lodgepole pine (Pinus contorta), within SCA:s Tjäderbergets diversity park. These stands were compared with managed stands of Scots pine (Pinus sylvestris). Bird species composition was collected by performing regular 25-minute inventories in each stand type at 5 time periods daily over a 6-day period in late March, 2020. Significant differences in species richness was discovered between a stand of free development and the managed stands as well as a stand treated for deciduous dominance and the managed stands. There were no significant differences with regard to neither species diversity between the observed stand types, nor the presence of specialists or generalists. Evenness between the stand types showed little variation. These results may be due to the overall low number of unique species and individuals in each stand type which likely resulted from low statistical power of the statistical tests. Further research into the effects of conservation measures in forests stands on bird fauna are needed to obtain conclusive results on how conservation measures affect local bird assemblages.