杨树不同无性系叶面积模型的选择及其建立

THE SELECTION AND ESTABLISHMENT OF LEAF AREA MODELS FOR CLONES OF POPULUS SPP.

应用Ｌｉ－３０００Ａ叶面积仪测定了８个无性系的叶型及叶面积指标，选择了８个模型，以叶片主脉长（Ｌ）和最大宽（Ｗ），以及两者乘积（Ｌ×Ｗ）为三个变量作与叶面积的相关关系分析，筛选出复相关系数均达０．９５以上的最佳模型为：（１）与两者乘积的叶面积模型：ｌｇＹ＝ａ＋ｂｘ＋ｂ＋ｃｌｇｘ，（２）与最大宽度的模型：Ｙ＝ａ＋ｂｘ＋ｃｘ２。但与叶片主脉长模拟效果较差。此外，还得出了杨树无性系的叶面积通用模型，即：Ｙ＝—０．４５０８２６十０．０００７１Ｘ＋０．９７６３３５ｌｇｘ（ｘ为Ｌ×Ｗ），和Ｙ＝—１．６９７３８７十０．７３３４９７ｘ—０．００１２５３ｘ２（ｘ为Ｗ）。上述８个无性系及杨树通用的模型的建立为叶面积的计算、预测等生理生态研究提供了科学依据，使得叶面积测定更加省时、可靠和方便。

The length and maximum width of leaf blades of 8 clones of Populus spp. were measured with Li ocr 3000A area meter, and 8 types of regression models were established to predict leaf area (Y) from leaf length (L),maximum width (W) or the product of L and W. The result showed thatthe best models were: (1) lgy = a + bx + clgx, where X for L ×W; (2) Y =a+bx+cx2, in which X was for W. But a poor relationship existed with the leaf length. Therefore, the above models for the 8 clones i. e. lgY=-0.450826 + 0 000771 + 0.976335lgx and Y=-1.697387 + 0.733497x-0.001253x2, were established, and might fit to other too.