Investigation of Phenology Events in a Broad Leaf Forest in Relation to Chlorophyll Content Change

Vegetation phenology, as used and studied the related studies, refers to the relationship between climate and periodic development of photosynthetic biomass. selected 15 Hornbeam plots (Carpinus betulus) from study area in a mountainous region from 520m to 1310m above sea level. Ground observations of hornbeam tree growth process from January to December 2004 in 15 day intervals were performed both visually and by measuring leaf chlorophyll concentration (Chlorophyll meter SPAD-502)and also we used a seasonal 8-day composite MODIS/NDVI. The Results for the regression analysis showed that the Leaved period positively correlated with the air temperature(r =0.894). Anthesis and SPAD measurement have negative relationship with air temperature and as temperature increases they appear earlier in year. Anthesis and SPAD measurement had correlation coefficients of r =-0.883 and r =-0.855 respectively. Regression analysis showed that there is a positive relationship between NDVI and SPAD measurement (chlorophyll contents) in hornbeam trees. The mid April was recognized as the mean onset period of vegetation green-up while late November as the mean onset period of vegetation dormancy for the entire national level. The development of remote sensing methods to measure leaf chlorophyll content and surface spectral reflectance has received much attention since variations in leaf chlorophyll content can provide information concerning the physiological state of a leaf or plant.