树高曲线是研究森林生长与收获的重要基础。以云南省香格里拉732株高山松天然林实测数据为例,分别选用11个经典常用的树高曲线,拟合高山松树高与胸径的关系,求解模型参数,用决定系数R2、均方根误差RMSE、残差和MD对模型的精度进行评价。结果表明:抛物线方程的R2=0.6073,RMSE=1.711,MD=-0.0101,经检验该方程Spearman相关系数为0.676,显著性水平Sig小于0.01,抛物线方程可以作为香格里拉高山松天然林的最优树高曲线,研究结果可为高山松的经营以及林分调查提供科学依据。
The study of tree height curve is an important basis in forest growth and harvesting.In this paper,we used the data of 732 individual trees of natural Pinus densata located in Shangri-La,Yunnan province,11 regular generalized height-curve models were chosen to establish the correlation between the DBH and the height of Pinus densata,calculate the accuracy of each model.Then,model selection was on the basis of correlation coefficient(R2),root mean square error(RMSE)and mean deviation(MD).The result showed that the Parabola model had the highest accuracy,its R2=0.6073,RMSE=1.711,MD=-0.0101,Spearman Correlation coefficient=0.676,and significance level<0.01,which was the best height curve of natural Pinus densata in Shangri-La.The model can provide a scientific basis for the management and survey of Pinus densata in Shangri-La
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