A major reason of making the gaps is the windthrow that is a factor of ecology turbulence, and it is a common disaster for wood productions, therefore , to study mechanism of windthrow is very important. There are no any investigations about this field in our country now. Mechanical mechanism of the windthrow have been opened out ,and an analytic principle and method have been suggested in the study, which combine mechanics with the biology properties in tree.
Spruce is the object studied in t...
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