Essays about: "white birch."

Showing result 1 - 5 of 9 essays containing the words white birch..

  1. 1. Comparison of native and introduced tree species in a range from low to high productivity sites in southern Sweden

    University essay from SLU/Southern Swedish Forest Research Centre

    Author : Gailene Brazaityte; [2023]
    Keywords : introduced tree species; low productivity sites; moderate productivity sites; high productivity sites; Picea abies; Pinus sylvestris; Betula pendula; Picea glauca; Picea mariana; Picea sitchensis; Pinus contorta; Pseudotsuga menziesii; Abies grandis; Populus balsamifera; Larix x eurolepis; Populus tremula × Populus tremuloides;

    Abstract : The dilemma of climate change, biodiversity conservation and economic efficiency in nowadays forestry leads us to search for the new solutions. Introduction of non-native tree species becomes a more frequently explored field as a solution for the future problems. READ MORE

  3. 2. Kväverikt spillvatten från sprängämnesproduktion - Potentiell råvara i gödsel?

    University essay from SLU/Dept. of Forest Ecology and Management

    Author : Pia Sundvall; [2016]
    Keywords : kväve; ammonium; nitrat; gödsling; fertilizer; resursutnyttjande; sprängämnesrester; restprodukt; recirkulation; Nitrogen; Ammonium; Nitrate; fertilizer; resource; explosives; residue; recirculation;

    Abstract : Kväve är en av de mest begränsande faktorerna för tillväxt hos vaskulära växter och en viktig ingrediens i konstgödsel, som idag kommit att bli en förutsättning för höga skördenivåer inom jord- och skogsbruk. Att framställa reaktivt kväve för odling är en överlevnadsfaktor för människor världen över, men skapar inte bara tillväxt, utan rubbar också den naturliga kvävebalansen. READ MORE

  4. 3. Clear-cut and substrate characteristics important for the occurrence of the beetle Upis ceramboides

    University essay from SLU/Dept. of Ecology

    Author : Ronny Naalisvaara; [2013]
    Keywords : Upis ceramboides; dead wood; clear-cut; prescribed burning;

    Abstract : Disturbances, such as fire and wind, are important for saproxylic beetles (= beetles depending on decaying wood) to gain substrate in boreal forests. Clear-cutting is an example of a man-made disturbance. Measures such as prescribed burning have been made to resemble natural disturbances. READ MORE

  5. 4. Xylan as Strength Enhancing Additive

    University essay from KTH/Skolan för kemivetenskap (CHE)

    Author : Zaheer Ahmad Mansoor; [2012]
    Keywords : Xylan; Kraft cooking; Tensile strength; Spruce wood; Agricultural waste;

    Abstract : The effect of xylan from different plant species on tensile properties of spruce pulp was studied. Xylans from spruce, birch, wheat straw and rice husks were mixed with the fresh white liquor and added at the later stages of separate kraft cooks, in exchange of the black liquor removed from the system at that time. READ MORE

  6. 5. Increase of tree abundance between 1960 and 2009 in the treeline of Luongastunturi in the northern Swedish Scandes : change detection based on aerial photographs

    University essay from Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskap

    Author : Oskar Löfgren; [2011]
    Keywords : geography; physical geography; treeline dynamics; mountain birch; aerial photo interpretation; geografi; naturgeografi; trädgränsen; fjällbjörk; flygbildstolkning; Earth and Environmental Sciences;

    Abstract : Aerial photo interpretation shows a recent densification of trees has been occurring between 1960 and 2009 in the mountain birch (Betula pubescens ssp. czerepanovii) forest of the treeline ecotone in northern Swedish mountains. READ MORE