林带防护特征与疏透度关系的研究

Study on the relationship between protective characters of forest belt and transparence degree

根据防护特征与疏透度建立的林带数学模型,在营造和营林上用人为能够控制的防护特征各因子对防护林带进行调节经营,使其达到期望的疏透度。模型不仅能对现有林带的疏透度进行预报,还能对最适疏透度的最优组合方案进行选择。在防护特征诸因子中,以林带结构对疏透度的影响最大,其余依次是株行距、树种、行数、横断面形状、枝下高和带高。

To establish shelterbelt model based on protective characterisitics and degree of transparence is to manage and to adjust shelterbelt by means of silvicultural technics and forest managerial measures associated with man-controlled protective characteristics in order to obtain expectant tran- sparence degree.In such a way it is possible not only to predict trans- parence degree of existing shelterbelts,but also to choose the optimum design of shelterbelts with adequate degree of transparence,Among a num- ber of factors that influence transparence degree,structural type of shel- terbelt is the most important,next the tree and row spacing,composition of species and number of rows,then the cross sectional form of shelter- belt,heights under branch and of shelterbelt.