Titlebook: Ecology of World Vegetation; O. W. Archibold Book 1995 Springer Science+Business Media Dordrecht 1995 biome.ecology.ecosystem.environment.

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The arid regions,itation increases. Conversely, winter precipitation in the deserts increases towards higher latitudes, and in coastal regions the evergreen trees and shrubs of the Mediterranean climatic regions become more conspicuous. In Asia the tropical deserts form the southern border of the extensive temperate deserts of the continental interior.

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Mediterranean ecosystems, the more open heathy ‘.’ comprised of shorter aromatic shrubs, such as lavender (.) and thyme (.). Intensive grazing by goats has created desert-like steppes in many areas and severe erosion problems have occurred on the rugged hillsides.

圓柱

Terrestrial wetlands, conditions. Fens are mostly supplied by water from the surrounding area which has picked up nutrients in its movement through the adjacent mineral soils. Sedges and grasses grow abundantly in these minerotrophic conditions.

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Freshwater ecosystems,ischarge (Wetzel, 1975). There is a tendency for materials to accumulate in the still water and consequently ponds and lakes undergo a natural ageing process. The rate of change depends on hydrologie conditions and the size and shape of the basin but it is generally assumed that the open water habitat is eventually lost.

Lacunar-Stroke

Complement

織物

Book 1995lly very spe- spent many hours on this project and their care and skill cialized in their scope and treatment. This book provides is reflected in the consistently high quality of the illus- a synthesis of this literature. A brief introductory chap- trations throughout the book. Many friends and col-

Friction

e are usually very spe- spent many hours on this project and their care and skill cialized in their scope and treatment. This book provides is reflected in the consistently high quality of the illus- a synthesis of this literature. A brief introductory chap- trations throughout the book. Many friend

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開(kāi)玩笑

The coniferous forests,on km. in temperate mountain areas. The mild, moist climate of the Pacific north-west coast of North America is also favourable for conifers: these forests cover about 0.5 million km. in a narrow coastal strip from Alaska to northern California (Olson, 1975).