穆棱地区主要树种叶面积研究

Leaf Area of Main Tree Species in Muling Region

基于穆棱市椴树、白桦、红松、冷杉和云杉5个树种的叶面积数据,采用二次抛物线形式拟合了各个树种树冠上层、中层、下层的叶面积与年龄之间的模型,并以红松为例绘制了各个层次叶面积与年龄的关系。结果表明:二次抛物线模型对椴树和红松的叶面积进行很好的拟合,模型的拟合优度很高,参数的稳定性很好,而其他树种的拟合效果则相对较差。通过绘制红松的叶面积与年龄的关系曲线可以看出,上层和下层的叶面积随着年龄的增大均在60年出现了峰值。

Based on the data of leaf area for Tilia tuan ,Betula platyphylla ,Pinus koraiensis ,Abies fabric & Pi-cea asperata in Muling City,model of leaf area and age of upper,middle,lower crown among each species was fitted by using second-degree parabola,relationship between leaf area and ages at all levels was drawn.Result show that:a parabolic line model of linden trees and pine leaf area were well fitted,high goodness of fit of the model,the sta-bility of the parameters is good and fitting effect of other species are relatively poor.Relationship curve drawn by leaf area and age of Pinus koraiensis shows that,the leaf area in upper and lower layers increases with the increase of the age,and both appear peak in the sixtieth year.