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BIODIVERSITY AND FUNTIONING OF SELECTED TERRESTRIAL ECOSYSTEMS : ALPINE AND ARCTIC ECOSYSTEMS

Ecosystem integrity on steep mountain slopes and in high elevation landscapes is in general a question of soil stability, which in turn depends on plant cover and rooting patterns. Terrestrial net primary production and decomposition rates in arctic and alpine ecosystems are low and revegetation after human disturbance can take centuries. Relatively few species regulate the annual input and loss of nitrogen from arctic and alpine ecosystems and changes in the abundance of these species could profoundly alter the resource base that governs rates of biogeochemical processes.