北京西山国家森林公园景观格局的初步研究

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，斑块类型增加了近一倍．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。

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

Great changes have taken place in the landscape pattern of Xishan NationalForest Park since the 1950’s。 Compared with that of the 1950’s,patch density increased byfive times,and patch types doubled in the late 1980’s.Dominant patches of shrubs and grasswere gradually replaced by stand patchs such as Pinus tabulaeformis,Platycladus orientalisand Robinia pseudoacacia, etc, which constituted the main part of the late 1980’s landscape。This change resulted from large scaled forestation over forty years。