The mixed forest is benefit to enhance the plant species diversity.

营造混交林有助于提高灌木层的植物种多样性；

Most researches however, were focused only on the species diversity.

但是，诸多的研究都停留在物种多样性的保护上。

Species diversity is biological diversity of species and its aggregation.

物种多样性是指物种及其集合体的生物学多样性。

With the succession, the species diversity of the tree layer increased gradually.

随着青冈群落演替进行，乔木层物种多样性逐渐增大。

The difference of habitat conditions resulted in the formation of species diversity.

生境条件的差异导致了物种多样性的形成。