详细信息
文献类型:期刊文献
中文题名:改进的简单竞争指标在单木生长模型中的应用
英文题名:Improved Hegyi Simple Competition Index in Individual Tree Model
作者:覃阳平[1] 张怀清[1] 陈永富[1] 蒋娴[1] 李永亮[1]
第一作者:覃阳平
机构:[1]中国林业科学研究院资源信息研究所
年份:2014
卷号:42
期号:12
起止页码:130-133
中文期刊名:东北林业大学学报
外文期刊名:Journal of Northeast Forestry University
收录:CSTPCD;;北大核心:【北大核心2011】;CSCD:【CSCD2013_2014】;
基金:国家"863"计划课题(2012AA102002)
语种:中文
中文关键词:杉木;Hegyi简单竞争指标;单木生长模型
外文关键词:Chinese fir plantations ( Cunninghamia lanceolata ) ; Hegyi simple competition index; Individual tree model
分类号:S715.3
摘要:以湖南省攸县黄丰桥国有林场杉木中龄林为研究对象,改进简单竞争指标,采用多元逐步回归和非线性回归的方法建立以单木大小、竞争和立地条件为自变量,单木直径连年生长量为因变量的估算模型,实现单木直径生长量的预测。研究结果显示:单木大小因子平方(D2)、竞争因子(CI)、立地条件(SL、SLP、E)对模型都有较大的影响,改进后的直径生长模型的决定系数R2为0.763,显著高于改进之前的结果(R2为0.710)。这说明简单竞争指标模型参数的指数为变量时,直径生长模型的拟合优度得到了显著提升,单木生长模型的预测效果更好。
With the middle-aged class China fir of Huangfengqiao State-owned Forest in You County , Hunan Province , we im-proved Hegyi simple competition index to forecast the increment of individual tree diameter with the estimation model using multiple regression method , and established nonlinear regression method with independent variables of individual tree size , competition factor and site conditions , and dependent variable of annual increment of individual tree diameter .Individual tree size factor (D^2), competition factor (CI), site conditions (SL, SLP, E)had a significant effect on the model with the determination coefficient ( R^2 ) of the improved diameter growth model of 0.763, significantly higher than the unmodified model (with the determination coefficient (R^2) of 0.710).The parameters’s exponent of Hegyi simple competition index model were variable , goodness of fit of the diameter growth model was increased dramatically , and individual tree model has better prediction results .
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