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《Shaanxi Forest Science and Technology》 1989-04
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DYNAMIC ANALYSIS OF ANNUAL GROWTH DURSERY OF POPULUS HOPEIENSIS HE ET CHOW FROM DIFFERENT GROWING PLACES

Qiu Mingguang Shao Chongbin Weng Junhua Li Zhouqi (Northwestern College of Forestry)  
The growth processes during nursery of Populus hopeiensis He et Chow from different growing places were described by mathematical model. The properties of annual growth from different growing places were stimul- ated by Logistic curve,and the maximum points of growth rate per day and the lengths of fast-growing stage were also estimated.On this basis the gr- owth patterns of different places were analysed.The growth curves of diffe- rent places were approached by cross cut polynomiad and coefficients β_0, β_1,β_2 which made up the growth curves were tested.The results indicated that the differences of the growth curves of height were significant in whole and each coefficients,these of diameter significant in each coefficients.
【Key Words】： Populus hopeiensis He et Chow Growthing place Logistic curve Fast-growing stage Growth curve
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