【摘要】 用空间代替时间与定点连续观测相结合的方法,对07～77a生窿缘桉海防林的生物量和生产力进行了研究。结果表明,窿缘桉林分的生物量是随着林分年龄的增长而增加,即由造林初期(07a生)的277thm2增加到主伐期(77a生)的70932thm2。不同年龄林分生物量的器官分配存在一定的变化,干材占总生物量的4253%～5634%,干皮1216%～1725%,光枝385%～530%,叶枝076%～449%,叶366%～692%,花果037%～059%,枯枝064%～242%,根2077%～2212%。在这些组份中,除了干材和光枝的比例随林分年龄的增长而增加外,其它组份均表现为递减趋势。平均而言,窿缘桉器官生物量分配的大小顺序为:干材>根系>树皮>叶>光枝>叶枝>枯枝>花果。窿缘桉林分的生产力,在不同年龄的林分中也存在较大的差异,变化在3693～12273t(hm2·a)之间。生产力的动态与生物量的动态规律明显不同,在造林初期,林分的生产力较低,只有3693t(hm2·a),3～4a生时生产力达到最大,为12273t(hm2·a),4a后林分的生产力出现下降,并保持在92～115t(hm2·a)的水平上。更多还原

【Abstract】 The biomass and productivity were investigated on the coastal protection forest of Eucalyptus exserta ,with the “time specific” and “fixed position” method.The results showed that biomass of Eucalyptus exserta stands were increscent with the increasing of stand age.It was 2 77 t/hm 2 in the stand of 0 7 year and was 70 932 t/hm 2 in the stand of 7 7 years.In the stands of different ages,there was different in the biomass distribution of tissues,the stem being ranged from 42 53% to 56 34%,the bark from 12 16% to 17 25%,the branch from 3 85% to 5 30%,the twig from 0 76% to 4 49%,the leaf from 3 66% to 6 92%,the flowerfruit from 0 37% to 0 59%,the dead branch from 0 64% to 2 42%,and the root from 20 77% to 22 12%. All the tissues,except the rates of stem and brance,were decrease with the increasing of stand ages.On an average,the biomass distribution of E.exserta were ranged in the order of stem>root>bark>leaf<branch>twig>dead branch>flower and fruit.In the stands of different ages,the productivity of E.exserta stands were different.The dynamic law of productivity of stands differ from those of biomass.The productivity of the young stand(0 7 aged stand)was low,for 3 693 t/(hm 2·a),while the productivity was the heighest during 3～4 years,for 12 273 t/(hm 2·a) and the productivity reduced after 4 years,and then it maintained between 9 2 and 11 5 t/(hm 2·a).更多还原