The plant diversity of the three types of forests:Populus davidiana,Quercus liaotungensis,and Populus davidiana-Quercus liaotungensis mixed forest in Ziwuling forest area of the Loess Plateau was studied.The results showed that in the proccss of from the vanguard community(Populus davidiana) to the climax community(Quercus liaotungensis) succession,the plant species richness index and plant diversity index assumed the drop tendency,but the mixed forest type was in the middle stage of succession,therefore it...
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