Omni-Directional Distribution Patterns of Montane Coniferous Forest in the Helan Mountains of China  

作　　者：PANG Yu ZHANG Bai-ping ZHAO Fang YAO Yong-hui ZHANG Shuo QI Wen-wen 

机构地区：[1]State Key Laboratory of Resources and Environmental Information System,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences [2]University of Chinese Academy of Sciences

出　　处：《Journal of Mountain Science》2013年第5期724-733,共10页山地科学学报（英文）

基　　金：supported by the Naional 973 project (2009CB421307) ;the National Natural Science Foundation of China (41030528 and 40971064)

摘　　要：Slope aspect has significant effect on the development and distribution of montane forest, especially in arid and semiarid regions. This paper, using SPOT5 images and 1：5o,ooo DEM, digitally extracts and analyzes the spatial information of montane coniferous forest （mainly Qinghai spruce）, and thereby explores how the upper and lower limits and the altitudinal range of coniferous forest vary and how the area of coniferous forest is related with annual insolation with all aspects in the Helan Mountains. The results show that： 1） In the eastern flank, the lower limit of coniferous forest is between 1,6oo m and a,ooo m a.s.l., and the upper limit between 2,800 m and 3,ooo m a.s.1.; in the western flank, the lower limit of coniferous forest is between a,ooo m and 2,300 m a.s.l., and the upper limit between 9,80o m and 3,1oo m a.s.1.2） The altitudinal ranges of coniferous forest are 8o6-1,435 m, 438-1,14o m for eastern flank and western flank, respectively. 3） The area of coniferous forest takes on a normal distribution with aspect, and it has a close relationship with annual insolation. This distribution model developed in this paper quantitatively reveals the significant effect of slope aspect on the distribution of coniferous forest in arid and semi-arid land.

关 键 词：Arid region Helan Mountains Qinghaispruce （Picea crassifolia） Aspect effect Coniferousforest Normal distribution 

分 类 号：S757[农业科学—森林经理学]