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accelerated erosion adjoining lowlands agricultural allocation of land altitudes altitudinal assessment avoided balanced land beauty Biosphere Reserve capability surveys climate conservation of flora cultural damage development in high domestic stock Ecological guidelines economic effects ensure environment environmental erosion control evaluated example forest products fuelwood genetic resources grassland grazing habitat herbivores high mountain areas high mountain regions high mountain soils hydrology important indigenous wild IUCN land-use livestock numbers long-term maintained measures ment mountain land mountain pastures Mountain rangelands native forests natural ecosystems natural landscape natural resource natural vegetation nature conservation necessary needs overgrazed particular physiographic planning plantations plants and animals policies populations possible potential Programme protected areas rainfall regeneration reserves reservoir shifting cultivation social suitable sustained cropping sustained yield Switzerland tain tion topography tourism traditional tree line UNEP United Nations various vegetation and fauna wild animals World Wildlife Fund Zealand zones