不同年龄橡胶-催吐萝芙木-降香黄檀复合生态系统中植物的生长动态及其生物量

Dynamics of growth and biomass of two mixed rubber+Rauvolfia vomitoria+Dalbergia odorifera systems with different stand ages

根据2个不同年龄橡胶—催吐萝芙木—降香黄檀复合生态系统样地的调查数据,采用所建立的生物量回归方程,分析了2个不同年龄复合生态系统中植物的生长动态、生物量及其分配特征。结果表明:4年生橡胶林下催吐萝芙木和降香黄檀的年均胸径生长量均显著大于7年生橡胶林下催吐萝芙木和降香黄檀的生长量,但年均高度生长量则无显著差异;在种植4.5 a后,前者的生物量分别是后者的2.86倍和2.90倍;4年生橡胶林复合生态系统的总生物量(67.49 t·hm-2)显著大于其单一橡胶林的生物量(47.06 t·hm-2),并超过7年生橡胶林复合生态系统(63.86 t·hm-2)及单一橡胶林的总生物量(60.38 t·hm-2);生物量的器官分配比例除4年生复合系统中的催吐萝芙木为茎>枝>根>叶外,均呈现出茎>根>枝>叶的趋势;随着橡胶年龄的增长,催吐萝芙木和降香黄檀的生长量和生物量虽呈下降的趋势,但橡胶的生物量及胶林复合生态系统的总生物量呈增长的趋势。橡胶林下催吐萝芙木和降香黄檀的种植具有提高生物量积累和碳固存的潜力和优势。

According to the survey data of two mixed rubber （with different tree ages）＋Rauvolfia vomitoria＋Dalbergia odoriferain the agroforestry systems with 4-year-old and 7-year-old and three 20 m × 25 m plots, by adopting the author established biomass regression equations, the plant growth dynamics, biomass and distribution in two agroforestry systems with different stand ages were analyzed and calculated. The results show that the annual meanbasal diameter growth of R. vomitoria and D.odorifera in 4-year-old mixed rubber-tree system was significantly greater than that of growing in 7-year-old mixed rubber-tree system, while the annual mean height growth of R.vomitoria and D.odorifera in two mixed rubber-tree systems were no significant differences; After R.vomitoria and D.odorifera were planted for 4.5 years in 4-year-old and 7-year-old rubber plantations, the biomass of the former was 2.86 and 2.90 times as much as that of the latter, respectively; The total biomass （67.49 t·hm^-2） of 4-year-old mixed rubber-tree system was significantly greater than that of the same years old rubber plantation （47.06 t·hm^-2）, as well as greater than that both of 7-year-old mixed rubber-tree system （63.86 ·hm^-2） and rubber plantation （60.38 t.hm-2）; Organ allocation pattem of biomass in two mixed rubber-tree systems and rubber plantations and trees was ranked as stem 〉 root 〉 branch 〉 leaf, except the pattern of stem 〉 branch 〉 root 〉 leaf for R.vomitoria in 4-year-old mixed rubber-tree system; The growth and biomass of R.vomitoria and D. odorifera declined while the biomass of rubber and the total biomass of mixed rubber-tree systems increased with the stand age, as well as revealed the advantage and potential for enhancing biomass accumulation and carbon sequestration ofR. vomitoria and D. odorifera intercropped with rubber plantation.