山西右玉县天然沙棘林林分类型及其经营利用方向的研究

山西省右玉县沙棘几乎遍布全县的山地、川滩、沟壑。就其资源分布和林分状况而言,在我国北方有相当大的代表性。本文根据天然沙棘林所处的立地和林分特点以及开发经营的需要,首先采用PCA主成分分析和ISODATA模糊聚类分析方法将该县天然沙棘林划分为4个林分类型组和8个林分类型。然后,采用逐步判别分析方法对8个林分类型分别建立了判别函数,并据此预测该地天然沙棘林类型。林分类型划分的基点是以沙棘产果的林分生产力为依据,除了确定以产果为主的改造利用类型外,其余类型因不具备建设产果基地的条件,而确定为其它经营利用方向。

A Study on the Standtypes of Natural Seabuckthorn and Direction of Management and in Utilization in Youyu County, Shanxi Province

The seabuckthorn (Hippophae rhamnoides Linn,subsp,sinensis Rousi) is widely distributed in the hilly areas,on the riverbanks and in the gullies in Youyu county,Shanxi province.It is representative of the northern part of China,with respect to the resource distribution and stand condition.The natural seabuckthorn stands which are distributed in Youyu county were divided into 4 stand type groups and 8 types by the application of PCA and ISODATA fuzzy classification methods.The division was based on features of the site and stand,in addition to the requirements of utilization and management.Then,the criterion function for the 8 stand types was established through stepwise critical analysis,in order to predict the stand type for the seabuckthorn natural forests.The basic point for the classification of stand type was the fruit productivity of the stand.The stand type which could be used for fruit production after the remould was defined.The other types were desigened for other directions of management and utilization,because of the lack of appropriate conditions for referencing the construction of the fruit-production bases.