With three accidents in felling operation of forest industry enterprises taken as examples,the causes of the above-mentioned accidents are analyzed,based on which preventive measures against the happening of relevant accidents are presented.
China's ancient forestry administration starts in the Xi Zhou Dynasty, which is indicated by the fact that its rulers attach importanc to the establishment of forestry official positionsand strengthen the administration of lumbering, and is caused by the perfect combination ofZhou' s ruling ideology and natural property view, as well as the rich forest resources at that time.
The Xi Zhou forestry administration includes forestry official postions and forestry policies, whoseoutstanding features are that forest is one of the natural resources that belong to the Zhou kings,lumbering is regularly timed;
Where clumps were well managed and scientifically harvested with a felling cycle of 6 to 8 years, culm production was higher, poles were longer and output was larger.
Volatiles emanating from Pinus radiata show only minor changes in composition with time after felling even though attractiveness of the felled timber to the wood wasp Sirex noctilio changes markedly over the first 3 weeks.
Oxygenated components (camphor, pinocamphone, isopinocamphone and trans-pinocarveol), which are absent or present in trace amounts immediately after felling, are produced in increasing amounts and account for 1% of the volatiles after 3 weeks.
It is shown that the predisposition to form helical structures is expressed to the greatest degree in N- and C-terminal segments of the CL3, its values felling markedly with increase of distance from the membrane.
However, paying more attention to the logging than to the silviculture for a long time lead that the felling amount has been more than the growth in volume of forest.