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《Journal of Mountain Science》 2013-03
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The Response of Vegetation Cover to the Variation of Heat and Water Conditions in Upper Minjiang Watershed,China

ZHANG Wenjiang 1,NING Jicai 2,SONG Kechao 1,LI Xiaodong 1,WANG Yan 1,WANG Xin 1,QIN Guanghua 1(1.State Key Laboratory of Hydraulics and Mountain River Engineering,Sichuan University,Chengdu 610064,Sichuan,China;2.College of Resources and Environment,Sichuan Agricultural University,Chengdu 611130,Sichuan,China)  
The upper Minjiang Watershed of China locates in the transfer zone from Tibetan Plateau to Sichuan Basin,where the local ecosystem is sensitive to the variation of heat and water conditions.Understanding the response mechanism of vegetation to heat and water is beneficial to conserve the water source of upper Yangtze River and to alleviate the soil erosion.The hydrological and meteorological observation and remote images were used to explore the intra-and inter-annual variations in the response of vegetation covers to heat and water conditions in upper Minjiang watershed.Results of this study suggested the preferable combination of heat and water in upper Minjiang is at the altitude belt between 2 000 ~ 3 000 m,where the dominant tree species is Sichuan-Yunnan Quercus semecarpifolia Smith.The region above 3 000 m in altitude is limited by heat condition,and the vegetation types are coniferous forest,shrub,meadow and alpine plant with the increase in altitude.The water plays the limiting factor in the region below 2 000 m because of the arid valley effect,and the dominant vegetation type is shrub.Therefore,the ACTUAL base vegetation spectrum(i.e.coniferous forest) is above the valley shrub belt,which causes the partial folding of the vertical vegetation spectrum in upper Minjiang valley.The climate of this area has been in the trend of warming and drought during past 40 years,which resulted in the gradual decrease in upper Minjiang discharge.The changing conditions of heat and water may shrink the distribution of forest in upper Minjiang watershed,which calls for necessary attentions to the increasing needs in water resources for the urban lower Minjiang watershed.
【Fund】: 国家自然科学基金青年基金项目(40801175 40901022 41201214);; 国防科工局民用航天项目;; 四川大学中央高校基本科研业务费项目~~
【CateGory Index】: Q948.11
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