α diversity will vary at different scales and different places in a community with environmental gradients or smallscale habitat heterogeneity.The diversity on different spatial scales along elevation gradient in deciduous broadleaved forest in Donglingshan Mountain,Beijing,China was studied in this paper,using transect sampling and with Shannon index analysis.The results showed that,1)Shannon index values of canopy layer,regeneration layer and shrub layer abruptly increased at the beginning and then kept ...