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《Journal of Gansu Forestry Science and Technology》 2009-03
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Analysis on the Distribution Pattern of Grass-Picea crassifolia Forest Dominant Population in the Northern Slope of Qilian Mountains

DI Hua1, LIU Jian-quan1, DING Guo-ming1, ZHANG Yuan-shan2, ZHANG Yi-peng3(1.Management Bureau in Qilian Mountains National Nature Reserve, Zhangye Gansu 734000, China;2.Haxi Protection Station of Qilian Mountains Nature Reserve, Tianzhu Gansu 733200, China;3.Longchanghe Protection Station of Qilian Mountains Nature Reserve, Su'nan Gansu 734400, China)  
Based on the investigation date of grass-Picea crassifolia forest in the middle and eastern section of Qilian Mountains, this paper analyzed distribution pattern of Picea crassifolia population though the determination the pattern index C with the pattern index method, and t-value, using aggregation intensity indicators:clumping index I, dispersal index IS, negative binomial parameter K, Cassie index CA and patch index L, the results showed:the Picea crassifolia population in the middle of the Qilian Mountains showed aggregation distribution, and then the mean aggregationλwas calculated, it proved that the cause of population aggregation distribution was interaction between population biology characteristic and the environment.The Picea crassifolia population in eastern section of Qilian Mountains was uniform distribution, changed from uniform distribution to random distribution, and the main cause is the competition between individuals, the individual dispersal distribution of population is the Poisson distribution in certain space.
【CateGory Index】: S791.18
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