檫树林下福建柏的生长规律

Growth features of  Fokienia hodginsii under the canopy of  Sassafras tsumu.

研究了１７年生檫树低产林分经强度采伐后套种福建柏所形成的混交林分中１６年生福建柏的生长情况、生物量组成及生长过程。结果表明，混交林中，福建柏的平均树高和平均胸径，分别比福建柏纯林大２０８ｍ和１５０ｃｍ。混交林中福建柏的生物量为１１３６９２ｔ·ｈｍ－２，比对照的福建柏纯林９９７７９ｔ·ｈｍ－２大１３９１３ｔ·ｈｍ－２，胸径总生长量、年均生长量分别大０９７ｃｍ和００６ｃｍ，树高的年均生长量大０１３６２ｍ，材积总生长量大００２８６７ｍ３，而且材积的速生期持续较久。福建柏胸径、树高和材积生长过程均符合Ｌｏｇｉｓｔｉｃ曲线。

Growth features,growth processes and biomass components of 16 year old Fokienia hodginsii plantation were analysed,which was previously planted under the canopy of the 17 year old heavily thinned  Sassafras tsumu forest.The average height and DBH of  Fokienia hodginsii in the mixed forest are 2 08 m and 1 50 cm greater than that in the pure forest,respectively.The biomass of  Fokienia hodginsii in the mixed forest is 113 692 t·hm -2 ,which is 13 913 t·hm -2 greater than that(99 779 t·hm -2 )in the pure forest.The total and average increment for DBH,average increment for height,and total volume increment of  Fokienia hodginsii in the mixed forest are 0 97 cm,0 06 cm,0 136 2 m and 0 028 67 m 3 greater than those in the pure forest,respectively.Growth processes for height and volume comform to Logistic curves with significant regression correlation.