Plant diversity and its elevational gradient patterns in Mengshan Mountain, Shandong, China PROPERTIES OF COMMUNITY STRUCTURAL COMPLEXITY DESCRIBED BY MEAN LENGTH OF HUFFMAN CODE Econom ic Va lue Assessment of Forest Spec ies D iversity Conserva tionin China Ba sed on the Shannon-W iener Index Study on the plant diversity under typical eucalyptus plantation in Zijin and Huidong, Guangdong province Community ecology of Acanthopanax giraldii in west Sichuan plateau