Abstract: 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.

Key words: Poplar clones, Leaf blade length, Lesf blade maximumwidth, Models