湖南省栎类削度方程模型研建  

Construction of Taper Equation for Quercus in Hunan Province

作　　者：邹泽林 米玛次仁 王金池 贺蔚成 黄鑫 兰俊宇 曹文昊 ZOU Zelin;Mimaciren;WANG Jinchi;HE Weicheng;HUANG Xin;LAN Junyu;CAO Wenhao(Central South Academy of Inventory and Planning of NFGA,Changsha 410014,Hunan,China;Forestry Inventory and Planning Institute of Xizang Autonomous Region,Lhasa 850005,Xizang,China;Central South University of Forestry and Technology,Changsha 410004,Hunan,China)

机构地区：[1]国家林业和草原局中南调查规划院,湖南长沙410014 [2]西藏自治区林业调查规划研究院,西藏拉萨850005 [3]中南林业科技大学,湖南长沙410004

出　　处：《中南林业调查规划》2023年第4期63-69,共7页Central South Forest Inventory and Planning

摘　　要：以湖南省栎类为研究对象,基于157株样木的直径-树高干形数据,拟合3种简单削度方程和3种可变参数削度方程。选取常用的模型评价指标,结合模型残差图和模型相对排序法,对6个模型进行综合对比评价,利用“留一法”对模型进行适用性检验。结果表明:6种削度方程的确定系数R^(2)和预估精度P分别超过0.94和99%,模型拟合效果较好;3种简单削度方程在树干基部均存在明显的系统偏差,而可变参数削度方程可有效减少这种系统偏差,拟合效果均优于简单削度方程;从模型评价指标和相对排序值可以看出,除MSE外,模型4的其余5项指标均在6个模型中表现最好,且模型4的整体排序值最小,可作为湖南省栎类的最优削度方程。Taking Quercus in Hunan Province as the research object,three simple taper equations and three variable-parameter taper equations were fitted based on the diameter-tree height stem taper data of 157 sample trees.The commonly used evaluation indexes on models were selected,and combined with the graph of the model residuals and model relative ranking method,the comprehensive evaluation on comparation of the six models was carried out.And the applicability of the models was tested by using leave-one-out method.The results showed that the R?(coefficient of determination)and P(prediction accuracy)of all the six taper equations were more than 0.94 and 99%,respectively,indicating good ftting effects.There were significant system deviations at the base of the trunk of the three simple taper equations,while the variable parameter taper equations could effectively reduce the system deviation,of which the ftting effects were all better than the simple taper equations.According to the evaluation indexes and relative ranking values of the models,except for MSE,the other 5 indexes of model 4 all performed best among the six models,and had the minimum overall ranking value,which can be used as the optimal taper equation of Quercus in Hunan Province.

关 键 词：栎类 削度方程 可变参数模型 湖南省 

分 类 号：S792.18[农业科学—林木遗传育种] S758[农业科学—林学]