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【目的】木麻黄是海南岛沿海主要的造林防护树种,量化估测木麻黄林生物量有利于明确木麻黄的碳汇贡献能力。【方法】以海南岛东林场木麻黄林为研究对象,选取了44株标准木,并获得其生物量实测数据。基于筛选的41株木麻黄样木生物量数据,分别选出地上和地下生物量最优独立模型,依据非线性度量误差模型的理论和求解方法,以及地上、地下生物量与材积变量之间的转换关系,建立了木麻黄地上生物量和地下生物量相容性模型,并采用加权回归消除各模型的异方差。【结果】地上、地下生物量最优独立模型为以胸径D为自变量的一元方程,立木材积的最优独立模型为以胸径D和树高H为自变量的二元独立模型;非线性度量误差联立方程组能够很好地解决生物量相容性的问题,地上、地下生物量和立木材积的决定系数R2均大于0.95,并很好地改进了单株预测精度(平均百分标准误差EMPSE均小于10%)和控制了平均预估误差;同时,得出生物量转换因子(EBCEF)和根茎比(R)的二元方程。【结论】此次建立的木麻黄生物量非线性联立方程组可用于大范围尺度估算木麻黄防护林的生物量及其碳储能力。
【Objective】 Casuarina is the main afforestation species in the coast of Hainan Island. Quantifying the biomass of Casuarina equisetifolia forest is helpful to clarify the contribution of Casuarina to carbon sink. 【Method】 Taking Casuarina equisetifolia in Donglin Farm of Hainan Island as the research object, 44 standard wood samples were selected and their biomass data were obtained. Based on the data of 41 strains of Casuarina equisetifolia, the optimal independent models of aboveground and underground biomass were selected respectively. According to the theory and method of nonlinear measurement error model and the relationship between aboveground and belowground biomass and volumetric variables The relationship between biomass and underground biomass in Casuarina equisetifolia was established, and the heteroscedasticity of each model was eliminated by weighted regression. 【Result】 The optimal independent model of above-ground and below-ground biomass was a unitary equation with DBH as independent variable. The optimal independent model of stand volume was a binary independent model with DBH and H as independent variables. Non-linearity The simultaneous equations of error can solve the problem of biomass compatibility. The determination coefficients R2 of above-ground, below-ground biomass and stumpage are both greater than 0.95 and improve the prediction accuracy of single plant (average percent standard error EMPSE less than 10%) and control the average estimation error; at the same time, the binary equation of biomass conversion factor (EBCEF) and rhizome ratio (R) was obtained. 【Conclusion】 The established simultaneous equations of biomass of Casuarina equisetifolia could be used to estimate the biomass and carbon storage capacity of Casuarina equisetifolia forest on a large scale.