Forkienia hodginsii is one of the most important tree species in south of China. However, the natrual forest of Forkienia hodginsii nearly does not exist now in China because of disorderly cut and bad management. For ...Forkienia hodginsii is one of the most important tree species in south of China. However, the natrual forest of Forkienia hodginsii nearly does not exist now in China because of disorderly cut and bad management. For this reason, a large area of plantation of Forkienia hodginsii was planted in Fujian Province since 1950’s, but the study on it was very little. In 1997, we studied the biomass of Forkienia hodginsii plantation in order to provide scientific basis for the other studies and management about it. We set the plots on the continuous slope and used the usual methods to study the biomass of Forkienia hodginsii plantation. The results showed: (1) We could estimate the biomass of F. hodginsii plantation with both models W=aD b and W=a(D 2H) b; (2) The biomass distribution on the continuous slope decreased gradually from bottom to top of the slope and the biomass had the smallest value on the top of the slope; (3) The biomass of trunk and bark went obviously down from base to top of tree, and did the ratio of branch to leaf so; (4) The proportion of photosynthetic yield that used to make up the trunk increased with the growth of stands, however, the proportion that used for other organs of tree decreased; (5) The ratio of root to whole tree almost always was same,about 20%; (6) In accordance with the diameter grade distribution of biomass, the diameter grade of biomass maximum was always larger one diameter class than that of number maximum.展开更多
通过对龙岩市福建柏〔Fokienia hodginsii(Dunn)Henry et Thomas〕天然林与人工林的种群分布格局、群落结构特征和物种多样性调查研究,结果表明:(1)福建柏种群在龙岩市域内7个县(市、区)分布广泛,现存天然林县域分布71.4%,且毛竹林群落...通过对龙岩市福建柏〔Fokienia hodginsii(Dunn)Henry et Thomas〕天然林与人工林的种群分布格局、群落结构特征和物种多样性调查研究,结果表明:(1)福建柏种群在龙岩市域内7个县(市、区)分布广泛,现存天然林县域分布71.4%,且毛竹林群落类型占99.2%。综合计算,40a人工林平均胸径19.9cm,比天然林大3.6cm,人工林平均树高14.1m,比天然林高2.4 m,差异显著。(2)天然林群落的物种丰富度(82种)高于人工林群落(26种)。(3)天然福建柏大径级居多,后续资源贫乏;人工林径级与株数呈正态分布。(4)福建柏林分各层次的物种多样性指数均高于人工林,但各层次的Pielou均匀度指数均低于人工林。因此,必须建立龙岩市福建柏种质资源保护体系,并采取福建柏与乡土树种等多树种混交方式造林,以增加群落的物种多样性,使群落层次更加丰富,森林群落结构保持稳定。展开更多
文摘Forkienia hodginsii is one of the most important tree species in south of China. However, the natrual forest of Forkienia hodginsii nearly does not exist now in China because of disorderly cut and bad management. For this reason, a large area of plantation of Forkienia hodginsii was planted in Fujian Province since 1950’s, but the study on it was very little. In 1997, we studied the biomass of Forkienia hodginsii plantation in order to provide scientific basis for the other studies and management about it. We set the plots on the continuous slope and used the usual methods to study the biomass of Forkienia hodginsii plantation. The results showed: (1) We could estimate the biomass of F. hodginsii plantation with both models W=aD b and W=a(D 2H) b; (2) The biomass distribution on the continuous slope decreased gradually from bottom to top of the slope and the biomass had the smallest value on the top of the slope; (3) The biomass of trunk and bark went obviously down from base to top of tree, and did the ratio of branch to leaf so; (4) The proportion of photosynthetic yield that used to make up the trunk increased with the growth of stands, however, the proportion that used for other organs of tree decreased; (5) The ratio of root to whole tree almost always was same,about 20%; (6) In accordance with the diameter grade distribution of biomass, the diameter grade of biomass maximum was always larger one diameter class than that of number maximum.
文摘通过对龙岩市福建柏〔Fokienia hodginsii(Dunn)Henry et Thomas〕天然林与人工林的种群分布格局、群落结构特征和物种多样性调查研究,结果表明:(1)福建柏种群在龙岩市域内7个县(市、区)分布广泛,现存天然林县域分布71.4%,且毛竹林群落类型占99.2%。综合计算,40a人工林平均胸径19.9cm,比天然林大3.6cm,人工林平均树高14.1m,比天然林高2.4 m,差异显著。(2)天然林群落的物种丰富度(82种)高于人工林群落(26种)。(3)天然福建柏大径级居多,后续资源贫乏;人工林径级与株数呈正态分布。(4)福建柏林分各层次的物种多样性指数均高于人工林,但各层次的Pielou均匀度指数均低于人工林。因此,必须建立龙岩市福建柏种质资源保护体系,并采取福建柏与乡土树种等多树种混交方式造林,以增加群落的物种多样性,使群落层次更加丰富,森林群落结构保持稳定。
