حللت الدراسة التباين الزمني للصور الفضائية MODIS NDVI لمجموعات الأرز اللبناني الطبيعية في القسم الشمالي الرطب من سلسلة الجبال الساحلية السورية على سفحها الشرقي (صلنفة، جوبة برغال)، و علاقتها مع المتغيرات المناخية (درجة الحرارة، الهطول المطري) خلال الفترة 2004-2014.
اُختبر التباين في قيم مؤشر الاختلاف النباتي القياسي (NDVI) السنوية و الفصلية لمجموعات الأرز، و التأثير التراكمي للمتغيرات المناخية (درجة الحرارة، الهطول المطري) في هذه المجموعات الحرجية باستخدام علاقات الانحدار الخطي البسيط (Simple Linear Regression) و معامل الارتباط ((Pearson.
أظهرت قيم اﻟ NDVI لمجموعات الأرز اللبناني تزايداً معنوياً في صلنفة و جوبة برغال (0.006، 0.004 / سنة) على التوالي. وجد إن قيم اﻟ NDVI السنوية ترتبط معنوياً مع المعدل السنوي للأمطار في جوبة برغال (R= 0.689). كما لوحظ اتجاهاً معنوياً نحو التزايد في قيم اﻟ NDVI الفصلية في صيف صلنفة و شتاء جوبة برغال (R= 0.638, R= 0.724) على التوالي.
أظهرت النتائج وجود تأثير تراكمي لدرجة الحرارة في الأرز اللبناني في صلنفة و جوبة برغال في الخريف و الشتاء، في حين لوحظ التأثير التراكمي للأمطار في الخريف و الصيف.
This study was analyzed the temporal variation of Moderate Resolution Imaging
Spectroradiometer (MODIS) Normalized Difference Vegetation Index (NDVI) of natural
stands of cedrus libani in the northern humid part and eastern exposure of the Syrian
coastal mountains (Slenfeh, Jawbat Burghal), and its correlation with climatic variables
(temperature and precipitation) during the period of 2004-2014. We examined the
interannual and seasonal variation in NDVI values of Cedrus stands, and accumulative
effects of climatic variables (temperature and precipitation) on stands using simple linear
regression and correlation (Pearson). The NDVI values of Cedrus libani stands showed
significant increase in Slenfeh and Jawbat Burghal (0.006, 0.004 /year) respectively. We
found that the annual mean NDVI was significantly correlated with annual mean
precipitation in Jawbat Burghal (R = 0.689).The significant increase trend of seasonal
mean NDVI was in Slenfeh summer and Jawbat Burghal winter (R = 0.638, R = 0.724)
respectively. The results showed, there were accumulative effects of temperature on
Cedrus libani in Slenfeh and Jawbat Burghal in autumn and winter, while the
accumulative effects of precipitation in autumn and summer were noted.
References used
BELL, B. Threat to Lebanon’s symbol of survival. BBC News, 27 August. 2008 Available at: http://news.bbc.co.uk/1/hi/7583757.stm
Bonan, GB. Forests and climate change: forcings, feedbacks,and the climate benefits of forests. Science (New York, NY) , 2008, 320:1444–1449
GIORGI, F. Climate change Hot-Spot. Geophysical Research Letters, 2006, 33, L08707
Climate change is the major global challenge facing water resources managers
because of its impacts on many life fields beginning with agriculture activities to economic
- social regions. In this study, drought in the eastern north of Syria have be
The importance of this modern technology (remote sensing) follows from the fact that it allows estimating the wood stock by knowing the value of the NDVI index, which reduces the high cost and great effort needed by traditional forestry measurements.
The research focuses on the demands on the study of the total investment evolution,
agricultural, investment and knowledge of the nature of the changes taking place during the
period (2000-2011), and evaluate the performance of the economy and its
The aim of the research was to clarify the pre-processing steps required for satellite images
before starting to analyze and extract data from them using the ENVI program.
Radiometric and topographic correction applied to the Landsat image 2017, an
comprehensive planning process for projects and private investment in residential
areas and Accessories form One of the main components of the urban planning process to
guide the processes of growth and urbanization away from the emergence of forms