关键词: 撑绿杂交竹, 分株生物量, 模型模拟

Abstract: [Objective] To estimate the biomass of sympodial bamboo better. [Method] The biomass of Bambus pervariabilis×Dendrocalamopsis daii of ramet with different diameter classes, ages and areas was estimated based on previous studies and field investigations. [Results] The proportion of culm biomass for 2-3 years bamboo was significantly greater than that of 4-year-old bamboo. For 2-3 years bamboo, the proportion of culm, branch and leaf biomass was 63.74%-79.99%, 8.63%-27.16% and 4.04%-11.38%, respectively. The proportion of culm biomass increased with increasing diameter class, but the opposite was true for the proportion of branch biomass. Moreover, the correlations were different in different regions. For example, the proportion of branch biomass was larger in Changning county than in Yaan city. Coversely, the proportion of leaf biomass was smaller in Changning county than in Yaan city. The B. pervariabilis×D. daii biomass can be well fitted by models. The aboveground biomass and culm biomass was calculated by the model of y=a₀+a₁x+a₂x₂+a₃x₃. The branch biomass was fitted by the model of y=a+bx and the leaves biomass was estimated by the model of y=ax^b. When comparing the differences between measured and simulated data, no significant difference was found between measured and simulated data in two plots of Changning county but significant difference(P<0.01) was observed in Shuifu of Yunnan province. [Conclusion] The allocation of bamboo biomass was affected by bamboo ages and diameter classes. Moreover, the patterns of biomass allocation were different in different regions, reflecting that bamboo of B. pervariabilis×D. daii had a strong morphological plasticity. When the biomass was estimated by model in different regions, it was necessary to choose a suitable model and adjust model coefficients.

Key words: Bambus pervariabilis×Dendrocalamopsis daii, biomass of ramet, model simulation