北京西山国家森林公园景观格局的初步研究

A Study on the Landscape Pattern of the Beijing Xishan National Forest Park

近40年来,西山国家森林公园的景观格局发生了根本的变化,斑块密度增加了5倍,斑块类型增加了近1倍.50年代初占优势的灌草丛斑块逐渐被以油松、侧柏和刺槐等为主的林分斑块所取代.林分斑块构成了整个景观的主体.大规模的造林活动是造成这一变化的最主要原因.

Great changes have taken place in the landscape pattern of the Xishan National For- est Park since the 1950's.Compared with that of the 1950's,patch density increased by five times,and patch types doubled in the late 1980's.Dominant patches of shrubs and grass were gradually replaced by stand patchs such as Pinus tabulaeformis,Platycladus orientalis and Robinia pseudoacacia,etc,which constituted the main part of the late 1980's landscape.This change resulted from large scaled aforestation over forty years.