安曹下杉木丰产林不同阶段生长比较研究

对安曹下杉木丰产林不同立木径级结构和不同阶段生长规律进行了研究,结果表明,杉木丰产林中杉木活立木的平均蓄积量高达966.58 m3.hm-2,断梢木和枯立木以中小径木占多数,断梢木以风折为主,枯立木主要受竞争分化而形成。杉木林分的平均胸径、平均树高、平均材积和平均蓄积量均随着年龄的增加而增加,其中前期相对后期生长量高,林分植被也随着时间的推移而复杂化、多样化。由于种群自疏机制的作用,林分密度随时间和胸径的增大而递减,自然稀疏机制明显。

Compared study on the growth in different stages of the Cunninghamia lanceolata forest in Ancaoxia

Based the data investigated and referred,the diameter structure of different kinds of wood and the growing regulation of different development stages were researched in the Chinese fir forest.The study showed that the storage of the living wood were added up to 966.58 m3·hm-2,most of the broken and dead woods were not large with their diameters.Among which the broken woods were almost broken by wind,and the main factor lead to the woods dead is competition.As forest age added,the average diameter,average height,average tree volume,and average stand volume increased.The increment was larger in former time than later.At the same time,the plants of the stand became complicated and diversity.As the time passing,the density of the stand declined,the diameter of the trees increased as well by population self-thinning mechanizes.