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为探明3个不同年龄橡胶(Hevea brasiliensis)林下萝芙木(Rauvolfia vomitoria)、大叶千斤拔(Flemingia macrophylla)及复合系统与橡胶纯林的年生长量及生物量,根据3个林龄(8、11和20 a)两种不同种植模式各样地的调查数据,计算了不同种植模式中橡胶、大叶千斤拔及萝芙木的年生长量。同时利用49和29株不同大小的大叶千斤拔和萝芙木样木个体建立了以基径平方乘以高度(BD2H)为自变量的生物量回归模型,根据所建立的生物量回归模型估算了不同种植模式各林分的生物量及生物量增量,并对其组成和分配特征进行了分析。结果表明:8、11和20 a生复合模式中的橡胶、大叶千斤拔和萝芙木的胸径或基径的年生长量和生物量增量均随着橡胶年龄的增大而减少,其橡胶的年胸径生长量分别是同龄橡胶纯林的1.16、1.01和1.17倍,年生物量增量分别是同龄橡胶纯林的1.13、1.08和1.49倍;3个林龄复合模式和橡胶纯林的总生物量均随林龄的增大而增长,而生物量增量随林龄而下降;复合模式的总生物量分别是其同龄橡胶纯林的2.35、1.60和1.17倍,生物量增量(53.20、33.64和11.18 t·hm-2)分别是同龄橡胶纯林的5.13、4.48和2.63倍;不论是复合模式还是橡胶纯林,其生物量器官分配均呈现出茎和枝所占的比例随林龄而增长,叶和根所占的比例随林龄而下降的规律。在橡胶林下种植其他植物种类,能显著提高生物量积累。
In order to investigate the annual growth and biomass of three Rauvolfia vomitoria, Flemingia macrophylla and composite systems and pure rubber forests of three different ages of Hevea brasiliensis, (8, 11 and 20 a) survey data from different plots of different planting modes, the annual growth of rubber, Lilium pumila and Rauwolfia in different planting modes was calculated. At the same time, biomass regression model based on BD2H was established based on 49 and 29 individuals with different sizes and Rauwolfia woody individuals, and was estimated based on the established biomass regression model The biomass and biomass increment of different planting patterns were analyzed, and their composition and distribution characteristics were analyzed. The results showed that the annual growth and biomass increment of DBH, DBH and ROPD decreased with the increase of rubber age in 8, 11 and 20 a composite models, The DBH of rubber was 1.16, 1.01 and 1.17 times of that of pure rubber plantation of the same age respectively. The increment of annual biomass was 1.13, 1.08 and 1.49 times of that of pure rubber plantation of the same age respectively. The composite model of three age and rubber plantation The total biomass increased with the increase of forest age, while the increment of biomass decreased with age. The total biomass of composite model was 2.35, 1.60 and 1.17 times of that of the same age pure rubbery forest, 53.20, 33.64 and 11.18 t · hm-2) were 5.13, 4.48 and 2.63 times of that of pure rubber plantation of the same age respectively. The biomass and organ distribution of both rubber plantation and mixed plantation showed the proportion of stem and branch with the forest Age and growth, the proportion of leaves and roots decline with the age of the law. Planting other plant species under rubber forests can significantly increase biomass accumulation.