Методические подходы к оценке продуктивности лесных экосистем (на примере ландшафтов Центрально-Лесного государственного природного биосферного заповедника)статья
Место издания:Издательство Тюменского государственного университета Тюмень
Первая страница:64
Последняя страница:67
Аннотация:The remote sensing and dendrochronological analysis are well-developed methods
widely used for monitoring forest productivity. Satellite data better corresponds to canopy biomass,
dendrochronological data describes timber increment, while forest is a complex ecosystem with different plant life forms and stratification. Since both data collection is rather quick and easy, the use of these methods is very appealing. Analysis of joint dynamics of Normal Difference Vegetation Index (NDVI) and tree ring growth and its comparison to corresponding values of Net Ecosystem production (NEP) derived from eddy covariance measurements should verify accuracy of this methods for estimation of the whole ecosystem productivity. Timber sampling was carried on in Central Forest Nature Reserve, Russia, at four coniferous forest ecosystems. NDVI were calculated for each site using Landsat images 4-5, 8. The series of NDVI values are 23-years long and characterize the canopy state in the period of highest vegetation (July, 15-25). The series of NEP values are from 1998 to 2014. The research revealed the reliable correlation (0.5-0.75) between middle frequency dynamics of NDVI and tree ring series. High frequency fluctuations of parameters proved to be independent. Multiple regression analysis shows that joint contribution of NDVI and annual radial increment to NEP describes only 49% of its variation. The study proves reliability but inconsistency of both indirect methods, while eddy covariance measurements are inaccessible for wide use.