九龙江流域杉木大径材生长特性的研究

Study on the Growth Characteristics of Big-Diameter Timber of Cunninghamia lanceolatain the Jiulongjiang River Valley

采用不同的数学模型对九龙江流域不同经营密度 (稀组、密组 )杉木林的生长特性进行分析研究 ,结果表明 :稀组的林分树高、胸径及材积生长量均高于密组 ,可提前达到大径材培育目标 ;密组尚未达到大径材培育目标 ,必须适当延长主伐年龄。最终保留林分株数应定为 1 1 0 0株·hm-2 。

The results indicate that the tree height ,dbh and volume growth of the stands of Cunninghamia lanceolatawith sparse management density are higher than those of the stands with dense management density and they may reach the goal of big-diameter culture ahead of time whereas the dense-density stands have not reached the goal of big-diameter culture and their final age should be properly extended.Therefore culturing the big-diameter timber of C.lanceolata is practical in the Jiulongjiang River Valley and the final retaining stand tree number should be 1100 trees per hm.