Because rapid bacterial decay prevents the accumulation of humus. 6. How do the soils in tropical deciduous forest differ from the soils in tropical rainforest? The soil in tdf has more nutrients, because the leaves fall down and trees grow more sparsely. 7. Describe the layers of tropical rainforest. Emergents forest giants, the trees there are 50m or more. Canopy a dence layer, the trees there are 20-30m. There can be found many hardwoods, such as mahagony. Understory a dark and a humid area, contains saplings between the trunks of larger trees. 8. How does the vegetation in tropical deciduous forest differ from the vegetation in tropical rainforest? Trf has more kinds of trees than tdc. About 70% of the plants in trf are trees. 9. Using the picture (given in the test) describe how a plant is adapted to the life in tropical rainforest? Epiphytes, liana, climbers or stranglers. 10. What is an epiphyte
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-broadleaf (decidious) trees (oak, beech pöök) · Coniferous trees -> consumption timber -> soft timber (spruce, pine, juniper) · Trees of little value (willow, bird-cherry toomingas) · Trees of special usage (fruits, cork) Forestry: · Planting, taking care of the trees · Protection of forests againts fire and pests · Soil improvement · Special forest plantations · Fertilisation · Plant breeding Forest Industry:
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