طريقة رياضية لحساب المساحة الورقية الفردية لنوعي أشجار القوغ (Populas nigra L.)‎ و (Populas euphratica L.)‎

الملخص EN

Because of the importance of leaf area in light reception, transpiration, photosynthesis and water and nutrient uptake, this study conducted to determine individual leaf area of poplar by easy, inexpensive, accurate, and nondestructive method through measuring leaf length and width and some combinations of both parameters.

Different leaves from Populus nigra and Populus euphratica species grown in TaqTaq city (9 Km from Koya city) at 2009.

Simple, multiple and exponential regression analyses were used from length and width and its com- binations as independent variables with leaf area as dependent variable for determine more accurate models (high coefficient of determination and less MSE).

The results showed that best models that more accurate estimation of poplar leaf area compare to other models was : Linear regression (LA = 5.586 + 0.501 W2 ) that depend on square leaf width as independent variable, the multiple linear model (LA = 6.538 + 0.079 L2 + 0.376 W2) that depend on leaf L2 with W2 as independent variables and exponential regression model (LA=6.452e0.215(W)) that depend on leaf width as independent variable.

These models enables the researcher to estimate accurately poplar leaf area without leaf destruction or using tools.