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
对受笋万纹象(O tid ogna thus rubricep s Chevro lot)、一字竹笋象(O.d av id is F a irm a ire)、大竹笋象(Cy rta trachelus long im anus F abric ius)危害后断梢毛竹、竹腔注药防治后毛竹、正常毛竹3种竹材进行竹材抗弯强度、抗...对受笋万纹象(O tid ogna thus rubricep s Chevro lot)、一字竹笋象(O.d av id is F a irm a ire)、大竹笋象(Cy rta trachelus long im anus F abric ius)危害后断梢毛竹、竹腔注药防治后毛竹、正常毛竹3种竹材进行竹材抗弯强度、抗弯弹性模量和顺纹抗拉强度测定结果表明,与正常毛竹相比较,受竹笋象危害断梢毛竹差异显著,3个竹材物理力学性质指标分别下降了43.79%、39.01%、29.28%,竹腔注药防治后毛竹3个指标下降了13.87%、10.95%、9.01%,但差异不显著,不影响竹材的使用价值。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.
文摘对受笋万纹象(O tid ogna thus rubricep s Chevro lot)、一字竹笋象(O.d av id is F a irm a ire)、大竹笋象(Cy rta trachelus long im anus F abric ius)危害后断梢毛竹、竹腔注药防治后毛竹、正常毛竹3种竹材进行竹材抗弯强度、抗弯弹性模量和顺纹抗拉强度测定结果表明,与正常毛竹相比较,受竹笋象危害断梢毛竹差异显著,3个竹材物理力学性质指标分别下降了43.79%、39.01%、29.28%,竹腔注药防治后毛竹3个指标下降了13.87%、10.95%、9.01%,但差异不显著,不影响竹材的使用价值。
