摘要：

The attributes of Robinia pseudoacacia,Pinus tabulaeformis plantations and natural Populus davidiana,Betula platyphylla and Quercus liaotungensis forests in Ziwuling Mountain of the Loess Plateau were comparatively studied by standard quadrat method.The results indicated that both the plantations and the forests of natural succession (the P.davidiana and B.platyphylla forests) were diverse in species consisting of about 62 species and the natural climax forest (Q.liaotungensis) was less diverse in species consisting of 48 species.The plantations and natural forests clearly differentiate into special layers and contained a certain number of interbeded lianas.From the angle of spatial structural pattern,the P.tabulaeformis plantations and natural forests presented well-developed arborous and shrub layers while the R.pseudoacacia forests had well-developped herbal layers.The plantation appeared diverse mainly in the herbal layers and the natural forests also presented a high diversity in the arborous and shrub layers.the similarity comparison of the population species with the natural Q.liaotungensis forests as the controls showed that the R.pseudoacacia plantations and the natural forests were weakly similar with their similarity index (I_s) at 19.1,but the P.tabulaeformis plantations and the natural forests were highly similar with their similarity index (I_s) at 43.3,and even their similarity was higher than the similarities to the natural B.platyphylla forests (33.3) and the P.davidiana forests (42.9).As a result,comparatively speaking,P.tabulaeformis is more suitable for the afforestation in Ziwuling Mountain of the loess plateau than R.pseudoacacia.

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