摘要
选用相对直径为单木竞争指标,通过引入哑变量建立间伐林分与未间伐林分统一的单木断面积、材积生长模型,经检验,模型对油松间伐林分、未间伐林分的预测精度都在96%以上。对单木生长模型进行变换,从而推导出林分生长模型,经检验,对油松林分断面积、蓄积量的预测精度都在86%以上。单木水平生长模型推导林分水平生长模型的方法解决了不同水平模型预测同一林分因子时预测效果不一致的问题,使得单木、林分两个水平的模型有机地耦合在一起,形成一个联系紧密的整体。该方法不仅适用于预测林分断面积、蓄积量,也适用于预测其他林分因子。
Relative diameter was used as the individual tree competition index, through introducing the dummy variables to integrate thinned stands and unthinned stands,the models of individual tree basal area and volume growth were established.The inspection showed that the prediction accuracies of the models for thinned stands and unthinned stands of Pinus tabulaeformis were over 96%. The stand growth models were derived from the individual tree growth models by transformtion, the inspection showed that the prediction accuracies for stand basal area and volume of Pinus tabulaeformis were over 86%. The method of deriving stand-level growth models from individual tree-level growth models has solved the problem that prediction effects of different level models on the prediction of the same stand factor was not consistent,so the individual tree-level and stand-level growth models have been coupled together organically as a whole.This method applies not only to the prediction of stand basal area and volume,but also applies to the prediction of other stand factors.
出处
《江西农业大学学报》
CAS
CSCD
北大核心
2014年第6期1298-1304,共7页
Acta Agriculturae Universitatis Jiangxiensis
基金
国家林业公益性行业科研专项(201004008)
关键词
油松
单木生长模型
林分生长模型
耦合
Pinus tabulaeformis individual tree growth models stand growth models coupling
