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以长白落叶松人工林为研究对象,应用平均标准木法及枝解析木法调查树冠生物量,并采用标准枝法与枝条模型估算法对估测的树冠生物量进行了比较研究。分析了枝长与枝基径,枝条生物量与枝基径、枝长等各因子的相关关系,建立一级枝长模型及枝条生物量模型。通过对枝条生物量估测模型的比较,结果表明:枝基径与枝条生物量、叶生物量有很高的相关性,幂函数拟合的精度较高,参数估计较稳定;虽然二次多项式模型拟合的相关系数较大,但因参数变动较大,预测不稳定。在树冠生物量模型研究中,基于胸径建立异速生物量模型,相关系数R2值达0.906以上;通过对估测树冠生物量模型的比较,枝条模型估测法优于标准枝法,同时对模型进行F检验,F值达极显著水平,所选枝条生物量模型对长白落叶松树冠生物量的估测具一定参考价值。
The Larix olgensis plantation was chosen as the research object. Crown biomass was surveyed by means of average standard wood method and branch tree analysis method. The crown biomass was estimated by standard branch method and branch model estimation method. The correlations between branch length and branch diameter, branch biomass and branch diameter, branch length and other factors were analyzed, and a first-level branch length model and shoot biomass model were established. The results showed that there was a high correlation between branch diameter and branch biomass and leaf biomass, and power function fitting accuracy was higher and parameter estimation was more stable. Although quadratic polynomial The correlation coefficient of the model fitting is larger, but the prediction is not stable due to the large variation of the parameters. In the study of crown biomass model, the allometric model was established based on the DBH, and the correlation coefficient (R2) value was above 0.906. By comparing the estimated crown biomass model, the branch model estimation method was superior to the standard branch method, The results of F test showed that the F value reached an extremely significant level. The selected shoot biomass model had certain reference value for estimating the crown biomass of Larix olgensis.