【摘要】 立地条件、林龄、密度是影响林分生长的3个主要因素,本研究采用Richards理论方程为基本模型,在模型中引入立地指数、株数密度、林分年龄3个因子,从而构建了研究区的杨树农田防护林带的可变密度的全林分蓄积生长模型,模型的建立为研究区蓄积量的预估打下基础.更多还原

【Abstract】 Site condition,yage and density are the main factors affecting the growth of stand.The varied-density whole-stand volume model is established by using Richards the oretic eauition as the basic model,and introduicing the site index,density and shelterbelt age to the model.The establishment of the model helps to predict the volume growth of farmland sheltbelts in study area.更多还原