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[5] 14. (a) starts with previously uncolonised area / bare ground / bare rock / AW; ref to pioneer species / named pioneer; series of recognisable, seres / stages; progresses to, climax / final equilibrium stage; max 2 (b) stabilise environment; soil development / increase humus / organic material; change soil pH; hold more water; release more minerals or nutrients / increase N content or fix N / hold ions; form microhabitat / reduce exposure / provide shelter / reduce erosion; max 3 (c) any two from following: grazing; burning; mowing / application of fertilizer / application of selective herbicide;
Rainforest: VÄGA PALJU VIHMA, temp 4-12 °C. ; Temperate deciduous forest: temp 20, kesk. vihm 5. Describe the soils of the. Temperate deciduous forest: Brown forest soils develop under the trees. Broadleaf trees tend to be nutrient-demanding and their leaves bind the major nutrient bases. The autumn leaf fall provides for an abundant and rich humus which begins to decay rapidly in spring just as the growing season begins. The humus content gives soil horizons a brown colour. Temperate rainforest: This forest has nutrient-rich soil because there is a lot of dead organic matter on the ground. This dead material is being slowly digested by the fungi, insects, and bacteria that live here. Temperate Grasslands: Calcification is the dominant soil-forming process in semiarid regions. When this process works on a loess that itself is rich in calcium, the world's most fertile soils are created, the chernozems (A Russian term meaning black soil)
forest is known as the tree line or timberline. Tundra comes from the Finnish word tunturi, meaning treeless plain. It is noted for its frost-moulded landscapes, extremely low temperatures, little precipitation, poor nutrients, and short growing seasons. Dead organic material functions as a nutrient pool. The two major nutrients are nitrogen and phosphorus. Nitrogen is created by biological fixation, and phosphorus is created by precipitation. The most distinctive characteristic of tundra soil is its permafrost, a permanently frozen layer of ground. The average winter temperature is -28°C, but the average summer temperature is 3-16°C. During the brief summers, the top section of the soil may thaw out allowing plants and microorganisms to grow and reproduce. However, these plants and microorganisms become dormant during the cold winter months. Soil is formed slowly. The constant freezing and thawing in the tundra helps to break the rocks into smaller pieces
Handbook of Meat Processing Handbook of Meat Processing Fidel Toldrá EDITOR A John Wiley & Sons, Inc., Publication Edition first published 2010 © 2010 Blackwell Publishing Blackwell Publishing was acquired by John Wiley & Sons in February 2007. Blackwell’s publishing program has been merged with Wiley’s global Scientific, Technical, and Medical business to form Wiley-Blackwell. Editorial Office 2121 State Avenue, Ames, Iowa 50014-8300, USA For details of our global editorial offices, for customer services, and for information about how to apply for permission to reuse the copyright material in this book, please see our website at www.wiley.com/ wiley-blackwell. Authorization to photocopy items for internal or personal use, or the internal or personal use of specific clients, is granted by Blackwell Publishing, provided that the base fee is paid directly to the Copyright Clearance Center, 222 Rosewood Drive, Danvers, MA 01923. F
Sunflower is not considered highly drought tolerant, but often produces satisfactory results when other crops are damaged during drought. Its extensively branched taproot, penetrating to 6.5 ft, aids the plant during water stress. A critical time for water stress is the period 20 days before and 20 days after flowering. If stress is likely during this period, irrigation will increase yield, oil percentage and test weight, but decrease protein percentage. B. Soil: Sunflower will grow in a wide range of soil types from sands to clays. The demands of a sunflower crop on soil macronutrients are not as great as corn, wheat or potato. As with other non-leguminous grain crops, nitrogen is usually the first limiting factor for yield. Medium to high levels of macronutrients are usually required for good plant growth. Sunflower stover contains a large proportion of these elements, which means sunflower is relatively inefficient in the use of these elements
United States and Canada have a pH below normal (about 5.3 for water). Several hundred of these have a pH too low to support any aquatic life. Aside from aquatic bodies, acid deposition can significantly impact forests. As acid rain falls on trees, it can make them lose their leaves, damage their bark, and stunt their growth. By damaging these parts of the tree, it makes them vulnerable to disease, extreme weather, and insects. Acid falling on a forest's soil is also harmful because it disrupts soil nutrients, kills microorganisms in the soil, and can sometimes cause a calcium deficiency. Trees at high altitudes are also susceptible to problems induced by acidic cloud cover as the moisture in the clouds blankets them. Damage to forests by acid rain is seen all over the world, but the most advanced cases are in Eastern Europe. It's estimated that in Germany and Poland, half of the forests are damaged, while 30% in Switzerland have been affected.
populatsioonid. 4. Ökoloogiliste tegurite liigitus Biootilised(liigisisesed ja liikide vahelised) ja abiootilised(klimaatilised, edaafilised jne,); Looduslikud ja antropogeensed, Maa rütmidega seonduvad: esmasperioodilised, sekundaarsed ja aperioodilised. 5. Selgitage autökoloogilise ja sünökoloogilise kasvukõvera vahelisi erinevusi Autecology is the ecology of a single species, its relations to its natural conditions like soil and climate. The science of the relations within the population of one species is called population ecology. Synecology on the other hand is the ecology of different species living in the same habitat, their relations with one another 6. Darwini postulaadid 1)Populatsiooni sees esineb individuaalset muutlikkust. 2)See muutlikkus on osaliselt päritav. 3)Iga populatsioon oleks võimeline hõivama kogu Maa, kui kõik indiviidid jääksid elama ja
grazing animals or fire. Many grasses take advantage of exposed, windy conditions and are wind pollinated. Soft stems enable prairie grasses to bend in the wind Priit Pensa Tartu Veeriku Kool http://www.geo.ut.ee/kooligeo/loodus/rohtlad.htm 8. Name some temperate grassland plants. (vt. ka õpik lk 64-65) Rhubarb, sweet vernal, Indian grass, purple coneflower, pampas grass 9. Describe the soil of temperate grassland. (vt. õpik lk 61) The soil of the temperate grasslands is deep and dark. The upper layers are the most fertile because of the buildup of many layers of dead branching stems and roots. This organic mater on the surface and in the dead roots provide a great degree of nourishment for the living plants. 10. Why are temperate grassland soils very fertile? (vt. õpik lk 61) Calfication is the dominat soil-forminf process in semiarid regions. When this process works
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