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Vertical Struture of Natural Broad-leaved Forest in North Fujian

Huang Qinglin(Forestry Department of Fujian Collepe of Forestry,Nanping 353001)Luo Fapan(Saxian Forestry Committee of Fujiam Province, Saxian 365500)Zheng Qunrui(Administrative Office of Wanmulin Nature Reserve,Jianou 353105)  
The tree layer of matural broad-leaved forest in North Fujian is divided into three sublayers based on tree beight.The coefficient of height variation for the whole stand increased with average age of the overstory trees.In order of coefficients of height variation,sublayer Ⅰsublayer Ⅱsublayer Ⅲ.The coeffiment of height variation for sublayer Ⅲ decreased with average age of the overstory trees,but reverse for sublayers Ⅱ,Ⅲ.SublayerⅠsublayer Ⅱsublaper Ⅲ in order of stem density,but reverse in order of stand volume.The standing stems of sublayer Ⅱ and sublayer Ⅲ altogether account for between 31 percent and 36 percent of the total stems,but between 92 percent and 94 percent of the total stand volumes.
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