Abstract：The statistical relationships between climate indexes(moisture index and warmth index)and typical pollen taxa were established with linear regression method on the Manas River drainage on the northern slope of the Tianshan Mountains. Climate and vegetation developments in this region were reconstructed based on the different pollen taxa content of a previously published sediment sequence from the Manas Lake， a desiccated end lake of the Manas River， as well as modern climate， vegetation and landform relationships. Since 13000 a BP， the palaeoclimate change in this area has experienced several important stages: warm-dry， cold-moist， warm-dry， cold-moist， warm-dry， cold-moist and warm-dry， in correspondance with the climate change， ancient vertical vegetation change around the area has experienced a series of succession processes: desert， desert steppe(to develop lowland meadow and stepped locally)， extreme arid desert， desert steppe， desert， desert steppe， desert. When the climate in the Manas River drainage changed from warm-dry to cold-moist， all vegetation boundaries in the area moved downward， hence the area of desert and forest was enlarged and the lower limit of conifer may get to current steppe. When the palaeoclimate changed from cold-moist to warm-dry， all vegetation boundaries moved upward， the area of desert was enlarged， while the area of steppe and forest was decreased， and the lower limit of conifer may get to current alpine and sub alpine meadow.
Ji Zhongkui,Liu Hongyan. Shifting of vertical vegetation zones in Manas River drainage on northern slope of Tianshan Mountains since the Late Glacier[J]. JOPC, 2009, 11(5): 534-541.
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