Forestry Importance: · Environmental-protective importance Oxygen Cleans the air/soils/ground water Protects the soil from erosion · Timber Firewood Woodwork Building materials Timber cellulose paper · Mushrooms/berries/juices · Habitat of different species Measuring the amount of forest: · Fixing the area under the forests (ha/%) -> In Estonia 47.4%, 2.143 mil/ha It doesn't take into account the amount of timber · To measure the amount of timber (m3) -> 352.7 mil/m3 It doesn't take into account the annual increase · To fix different species of trees (%) -> Pine 40%, Birch 30%, Spruce 20% · To measure the annual increase of timber (m3, ha, year) -> 9 mil. m3/ha/year Main principle of the economy of forests: Annual cutting should be equal to annual increase. Trees are divided into: · Precious trees (ebony, mahagony, sandalwood) · Hard-br...
Savanna A savanna is a grassland ecosystem with scattered trees or shrubs. In savannas trees are small or widely spaced so that the canopy does not close. It is often believed that savannas are characterized by widely spaced, scattered trees, however in many savanna communities tree densities are higher and trees are more regularly spaced than in forest communities. The open canopy allows sufficient light to reach the ground to support an unbroken herbaceous layer consisting primarily of C4 grasses. Savannas are also characterised by seasonal water availability, with the majority of rainfall being confined to one season of the year. Savannas can be associated with several types of biomes. Savannas are frequently seen as a transitional zone, occurring between forest and desert or prairie. Although the term savanna is believed to have originally come from a Native American word describing "land which is without trees but with ...
1. (a) (i) gene length of DNA; codes for a (specific), polypeptide / protein / RNA; max 1 allele alternative form of a gene; found at a, locus / particular position on, a chromosome; max 1 (ii) assume allele refers to coat colour allele (coat colour) gene / alleles, only on X chromosome; A no (coat colour), gene / allele, on Y chromosome male cats, XY / only have one X chromosome; males have only one (coat colour) allele / cannot have two (coat colour) alleles; need black and orange alleles for tortoiseshell colour; 2 r r w w (b) parental genotypes C C × C C ; r w ...
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