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对广东省遂溪县北坡林场1～4年生尾细桉人工林的生物量和能量进行研究.结果表明:林龄对林分现存生物量影响极显著(P<0.01),1～4年生林分生物量在10.61～147.28t.hm-2,随林龄增加,各组分和林分的生物量均增加,叶片、枝、树皮生物量占林分总生物量的比例逐年减小,而树干则呈逐年升高趋势.4个林龄阶段各组分生物量的分布规律,1～2年生为树干>枝>树皮>根>叶片,3～4年生为树干>根>枝>树皮>叶片.不同林龄各组分的平均灰分含量在0.47%～5.91%,以树皮的灰分含量最高、树干最低.各组分的平均干质量热值和去灰分热值分别为17.33～20.60kJ.g-1和18.42～21.59kJ.g-1,均以叶片数值最高、树皮最低.林龄对枝、树干、树皮的干质量热值及对叶片、树干、树皮的去灰分热值有显著影响(P<0.05),对叶片和根的干质量热值、枝和根的去灰分热值及植物体热值的影响不显著(P>0.05).1～4年生尾细桉的林分能量现存量在199.98～2837.20GJ.hm-2,林龄对其的影响达极显著水平(P<0.01),随林龄增长,各组分和林分能量现存量增加,且各组分能量分配比例的变化趋势与生物量相同.
The biomass and energy of 1-year-old Eucalyptus urophylla plantations in North Slope Farm in Suixi County, Guangdong Province were studied.The results showed that the effect of stand age on the existing biomass was significant (P <0.01) The stand biomass increased from 10.61 to 147.28t.hm-2, with the increase of stand age, the biomass of each component and stand increased, the proportion of biomass of leaves, branches and barks to total stand biomass decreased year by year , While the trunk showed a year-by-year upward trend.The distribution of biomass in each of the four stands was as follows: tree trunk> branch> bark> root> leaf from 1 to 2 years old, and trunk to root> branch from 3 to 4 years > Bark> leaf.The average ash content of each component in different stand ages ranged from 0.47% to 5.91%, with the highest ash content and lowest tree trunk.The average dry matter calorific value and ash removal calorific value of each component were 17.33 ~ 20.60kJ.g-1 and 18.42 ~ 21.59kJ.g-1, respectively, with the highest value of leaves and the lowest of bark.The dry calorific values of branches, trunk and bark, (P <0.05), and had no significant effect on the calorific value of dry weight, the ash removal calorific values of plant and root and the plant caloric value (P> 0.05) .1-4 Annual The existing stand energy of Eucalyptus grandis was between 199.98 and 2837.20GJ.hm-2, and the influence of stand age on it was significant (P <0.01). With the increase of stand age, the existing energy of each component and stand increased, The trend of energy distribution proportion of each component is the same as that of biomass.