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Glossary for Ecosystems: Change and Challenge
Abiotic Non- living components of an ecosystem including climate (temperature and
precipitation), soil characteristics, parent rock, air, relief, drainage
Arresting The factors that cause succession to be interrupted
Autotroph Green plants that photosynthesise to produce their own food to support trophic
levels above…

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Herbivore Animal that only eats plants; tropic level 2
Horizon Distinct horizontal layer in a soil profile
Humus Decomposed organic matter in the A-horizon
Illuviation Process of deposition or washing in of soil material from the A to the B horizon in a
podsol. This material has been removed from…

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