تقدير مؤشر المسطح الورقي (LAI)‎ لمجموعات الصنوبر البروتي Pinus brutia Ten. في مواقع التشجير الاصطناعي في منطقة جبلة (سورية)‎ باستخدام الصور الفضائية

الملخص EN

This research aims to estimate the (LAI) for Pinus brutia stands using the Normalized Difference Vegetation Index (NDVI), which is calculated from the satellite images.

The 29 field samples were carried out during the summer of 2013 and 13 field samples during the winter of 2014, the 12 photographs of pine leaf mass were taken in each sample The LAI was calculated by application of supervised classification using of leaf spectral signature, using (348) photographs taken in the summer and (156) ones in the winter.

The NDVI was calculated from 2 images of Landsat 8, with spatial resolution of 30 m, the first one was taken on 4 /07/2013, the other one was taken on 13/02/2014.

The model which allows to estimate the LAI using NDVI was found by using 27 samples, and this model was tested by using 15 samples.

The results showed that the (LAI) value of the P.

brutia samples ranged between (0.11 - 0.55) in the summer and between (0.21- 0.47) in the winter, the NDVI value of the P.

brutia samples ranged between (0.04 - 0.29) in the summer and between (0.15 - 0.28) in the winter.

The results also confirmed the presence of a linear relationship between the indices (LAI) and (NDVI).

In the study area, the (R2) value reached 0.88, the model bias error (ē%) was about (0.993%).

The relative standard deviation of the average error Model (Se%) and the accuracy Model (mx%) were about (0.51%) and (0.003%) respectively; that expresses a good accuracy of the obtained model, which in turn allows to realize a model permitting the estimation of the leaf area index of P.

brutia stands at the Syria scale