湖南省杉木与马尾松不同起源下生长率模型1）

摘要

With Chinese Fir and Masson Pine data of the sixth and the seventh continuous forest inventory data of Hunan Prov-ince, the growth rate models under different origins were simulated and compared.The growth rate is the greatest when DBH of Chinese Fir plantations and natural forests is 11 cm, and 13 cm for Masson pine of plantations and natural forests. Growth rate of Chinese Fir plantations is greater than that of Chinese Fir natural forests when DBH is greater than 11 cm. Growth rate of Masson pine of plantations is greater than that of Masson pine of natural forests when DBH is greater than 35 cm.%基于湖南省第六次、第七次森林清查数据中杉木与马尾松的样木资料，利用生长率公式，建立不同起源下的生长率模型并进行对比分析。研究结果表明：人工杉木与天然杉木在胸径为11 cm时，生长率达到最大值；人工马尾松与天然马尾松在胸径为13 cm时，生长率达到最大值。在胸径＞11 cm时，人工杉木生长率大于天然杉木生长率，差异较明显；在胸径＞35 cm时，人工马尾松生长率大于天然马尾松生长率，整体生长率变化差异不明显。