SUST 100 Lecture Notes - Lecture 2: Land Degradation, Shahjalal University Of Science And Technology, Ecosystem Services
17 May 2017
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Biomes: assemblage of plants, animals, and other organisms that occupy a region: defined by their climate and dominant vegetation. Grown naturally following some disturbance (fire, diseases, etc. ) Ecosystem / economic services: provide these for humans, forestry is necessary argument cannot be total conservation. Need trees but need to use them in an economic way: ecological (ecosystem) services: provide chemical cycling, habitat of wildlife, erosion control, and carbons storage, economic services: provide paper, tourism, etc. Types: tropical, temperate, boreal / taiga. Disturbance: can be large scale or small scale. Succession: change in assemblage of species or ecosystems over time: primary. No soil bare rock exposed (e. g. lava rock) See changes in the assemblages of species over time: secondary. Disturbances can help to renew a forest or grassland. Usual stages: annual plants, perennial herbaceous plants, shrubs, softwood trees (like pines, hardwood trees. Alters surrounding ecosystem (e. g. contributing to desertification) Low impact in terms of sustainability but more expensive.
