shrub layer造句怎么写

Study on species niche of Schima superba and Pinus massoniana artificial forest shrub layer

The complicated vertical structure could be divided into tree layer, shrub layer and herb layer, as well as a definite number of interstratum plants.

The species richness and diversity index of the tree layer and the shrub layer was obviously higher than that of the herb layer, and their evenness had evident difference.

The species richness and species diversity index of the tree layer and shrub layer were obviously bigger than those of the herb layer.

There was no significant difference of diversity index between the tree layer and the shrub layer.

Arbor and shrub layer comprised 94.8% and 1.2% of the biomass, herb and litter layer comprised 0.7% and 3.3% of the value,respec- tively.