Seasonal Variation Of Canopy Spectral Characteristics In Broadleaved Korean Pine Forests And Broadleaved Forest

This research taking broad-leaved Korean pine forests at different succession stages of Cnangbai Mountain Nature Reserve as research object,utilizes 1984-2015 Landsat Remote Sensing Images to Extract Canopy Spectra and Calculate Vegetation Index.At the same time,fitting using logistic curves,Landsat remote sensing images were used to extract data from the growing season in Langxiang.Liangshui and Fenglin nature growing season for comparison.The seasonal variations of the reflectivity of the visible and near-infrared bands in the primary broadleaved mixed forest and the secondary broadleaved forest are basically same,while the reflectivity at the same time has a certain difference.After the beginning of the growing season,the reflectivity in the visible light band tends to stabilize after a period of time has fallen,The reflectance in the near-infrared band tends to stabilize after rising for some time;At the end of the growing season,both the visible and near-infrared reflectance return to their original levels?Visible and near-infrared band reflectivity of primary forest canopy in Changbai Mountain is generally lower than that of secondary forest,but they are similar to the process of seasonal changes?After the end of the growing season,the end of the rise of reflectivity in the visible light band is different,and the original forest will end faster.The beginning of the growing season of the primary forest and the secondary forest is at the end of April and the end of the season is at the end of September.The length of the growing season is about 150 days and in recent years the growing season in this area has an early trend.The spectral characteristics of the canopy of primary forest and secondary forest in the same region have similar processes during the growing season.The temperature of the primary broad-leaved Korean pine forest and secondary forest at the beginning of the growing season is about 10?.The accumulated temperature above 0? is bigger than 200?,and the accumulated temperature above 5? is bigger than 50?.