摘要
利用 10块山杨、桦树 (简称杨桦 )天然混交次生林标准地的实测资料 ,对两树种地径与直径的关系进行了研究 ,并建立了相应的线性模型 ,其相关系数均在 0 99以上 ,拟合效果良好 。
The relationship of diameter and diameter at butt end was studied with the data of ten plots of Populus davidiana-Betulu platyphylla secondary mixed forests.It could be characterized by a linear model, y=a+bx. All correlation-coefficient were above 0 99.The results provided references for research and production.
出处
《河北林果研究》
2001年第1期14-16,共3页
Hebei Journal of Forestry and Orchard Research