关键词: 大叶相思, 化学组成, 利用方式

Abstract:

The growth volume of Acacia auriculiformis tree was investigated at the same age and the different forest stand,its chemical composition was determined and utilization of pertinent regions were studied.The results showed that the volume of timber and the biomass of the tree had increased by 14.8% and 43.4% respectively when it was compared coppice stand to seeding stand.It proved that the young trees developed from fastgrowing species would be fastgrowing in its early period.Its wood properties were changed a little by its forest stand.Its average basic density is lighter than 0.60 g·cm^-3,its fiber length is 898～916 μm,its radio of wall to cavity is 0.56～0.6(<1),and its fiber suppleness proportion is 59.3～ 68.5(it is among the range from 75 to 50).The yield of screen stock is more than 44% when pulping by Kraft process,the quality of wood pulp meets the standard of hard wood KP pulp.Acacia auriculiformis is the perfect host of Lac insects.The yield of tree stick lac from coppice stand is higher than that from seeding stand;The net increase production of tree stick lac is 1.42kg.The chemical composition of wood was almost the same and that of the bark was different slightly when the trees were stocked by lac insects,and the tannin amount of bark reached to 9.97%～11.40%(>8%)also.The product quality and the properties of tanning extracts made from this bark were better than the first degree of GB2619 81.When the trunk and branch is used for culture medium of domestic fungus,such as Pasania fungus,the yield of Pasania fungus and biological efficiency were remarkable higher than control groups.The optimum utilize process was studied depending on economic benefit exploiting from vary products. The best economic benefit will be yield from the artificial forest of Acacia auriculiformis when the following process is followed.Firstly,the 3-year-old coppice stands were stocked by lac insects. Then cut was down after collecting the tree stick lac and debarking the trunk and the branch.Thirdly,the debarking trunk and branch was used for culture medium of domestic fungus and the bark was used for producing tanning extracts.

Key words: Acacia auriculiformis, Chemical composition, Utilization model