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《Geographical Research》 2006-06
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Distribution and geographical analysis of altitudinal belts in the Altun-Qilian Mountains

XU Juan~(1,2),ZHANG Bai-ping~1,ZHU Yun-hai~(1,2),SUN Ran-hao~(1,2)(1.State Key Lab of Resources and Environment Information System,IGSNRR,CAS,Beijing 100101,China;2.Graduate School of the Chinese Academy of Sciences,Beijing 100039,China)  
The Altun and Qilian mountains,situated in the northeastern edge of the Tibetan Plateau and influenced by westerly wind and monsoon and its internal atmospheric circulation,are characterized by unique vegetation zonal spectra.Zonal spectra turn out to be quite different in the southern and northern flanks,although with desert as a common base belt.Our analysis indicates that the longitudinal distribution of the montane desert-steppe belt and steppe belt accord to quadratic and linear models,respectively,on the northern slopes.The distribution model of the sub-nival belt on the northern slopes is almost identical with that of air temperature of zero in July.Forest belts exist within the altitude of 2500 m to 3500 m a.s.l.east of Jingtie Mountain.Meteorological observation data are used to compute air temperature and humidity indexes,including mean difference of air temperature of dew point and gradient,annual and January mean air temperature,and annual mean precipitation,so as to interpret the distribution of zonal spectra.The results indicate that humidity gradient gradually increases from less than 0.09℃/100m to the east of Jiuquan to more than 0.12℃/100m to the west,and that vertically radical change of humidity is closely related with sparse vegetation distribution and that the sub-nival belt decreasing from the east to the west and from the edge to the interior of the Plateau was caused by the climate impacts of the elevated heating over the Tibetan Plateau.
【Fund】: 国家自然科学基金项目(40571010)
【CateGory Index】: Q948
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