Growth Rhythm of Dominant Populations in Semi-natural Cunninghamia lanceolata Forest Mixed with Broad-leaved Trees

By using modified logistic model, the growth rate for basal area of dominant populations was studied in semi-natural mixed forest in Fujian Province. Among populations in communities Cunninghamia lanceolata I Alniphyllum fortunei I Castanopsis carlesii ( I ), Cunninghamia lanceolata I Castanopsis fissa I C. carlesii ( II ), Castanopsis carlesii I Cunninghamia lanceolata (Ⅲ), and Cunninghamia lanceolata / Alniphyllum fortunei / Castanopsis carlesii / C. fissa (IV), community IV had best growth rate for Cunninghamia lanceolata, showing that the more dominant broad-leaved tree species dominated in mixed forest the better the C. lanceolata grew. In community with dominant broad-leaved species not more than three, maximum growth rate for C. lanceolata appeared at 4-6 cm dbh, while that more than three, at 8-10 cm dbh. The growth rate for C. lanceolata in the four communities was in order in ⅣⅡⅠⅢ