【摘要】 采用解析木法与整株收获法分析已达轮伐期的马尾松广东种源和湖北当地种源的生长进程及地上、地下生物量分配格局,分析生长快速与缓慢种源人工林生长过程及生产力形成过程中生物量分配模式,探讨2个种源的长期适应性差异的机制。根据胸径(DBH)大小将解析木划分为3个等级:12 cm≤DBH<18 cm, 18 cm≤DBH<26 cm和26 cm≤DBH<34 cm。结果如下:①广东种源在25年生连年生长量达最大值0.015 m3·a-1, 35年生平均生长量达最大值0.011 m3·a-1,湖北种源30年生时连年生长量达最大值0.011 m3·a-1, 42年生时平均生长量达最大值0.007 1 m3·a-1。②广东种源分配较多比例的生物量给地下部分, 2个种源的粗根生物量存在显著差异(P<0.05),随胸径增加,相对差异(RE,GD/HB)分别为36.5%, 62.9%和47.5%,而细根间生物量未达显著性差异。在胸径范围2 634 cm内, 2个种源人工林在整株生物量、地上部分生物量、树干和针叶生物量差异显著(P<0.05)。③湖北种源地下生物量分配比例在整个生长过程中均低于广东种源;在生长初期,湖北种源树干所占总生物量比例高于广东种源,而枝和叶的生物量分配比例低于广东种源;随着树龄增长,广东种源树干所占总生物量比例逐渐高于湖北种源,并趋于稳定;而枝、叶正好相反。因此,引种的广东种源生长性状及树干生物量均表现出快速增长的特点,数量成熟年龄较湖北种源提前,栽植快速成长的种源将增加人工林生物量。更多还原

【Abstract】 To analyze biomass allocation in the pro cess of productivity formation in man-made forests of fastand slow-growing provenances,Masson pine(Pinus massoniana),an important man-made forest species in south China,was used.Different mechanisms of long-term adaptation in the two provenance types were also discussed.The allocation patterns of above-and below-ground biomass in Guangdong and Hubei provenances were analyzed by using the whole plant harvest method.According to differing diameter at breast heights(DBH),the analytic trees were grouped into three classes:12 cm ≤DBH<18 cm,18 cm≤DBH<26 cm,and 26 cm≤DBH<34 cm.Results showed that(1) The maximum of annual growth of Guangdong provenance reached 0.015 m3·a-1 in 25 years and the average annual growth of Guangdong provenance reached 0.011 m3·a-1 in 30 years.In addition,the maximum of annual growth of Hubei provenance reached 0.011 and 0.007 m3·a-1 in 30 and 42 years,respectively.(2) A large proportion of biomass was distributed to the underground part in Guangdong provenance.There were significant differences in the crude root biomass of the two provenances(P<0.05).With the increasing of chest diameter,the relative difference were 36.5%,62.9% and 47.5%,respectively,while there was no significant difference in the biomass between the fine roots.In the DBHrange from 26 to 34 cm,there were significant differences among the biomass of the whole plant,the aboveground part,the tree trunk and the conifer(P<0.05).(3) The biomass allocation proportion of Hubei provenance for the whole growth process in the 3 DBHclasses was lower than that of the Guangdong provenance.At the initial stage of growth,the total biomass of the trunk in the Hubei provenance was higher than that in the Guangdong seed source;whereas,the biomass allocation proportions of branches and leaves was lower.As tree age increased,the proportion of total biomass for the tree trunk in the Guangdong provenance was gradually higher than that in the Hubei provenance and tended to be stable.However,the results were opposite in the branches and leaves.Therefore,the growth characters and the biomass of tree trunks showed the characteristic of rapid growth in Guangdong provenance,while quantitative maturity age was earlier than that in Hubei provenance.更多还原