Lake Onego, as one of the largest water bodies in a humid zone, is the recipient of terrestrial carbon and plays an important role in the global balance of this element. Due to heterotrophic metabolism in the Lake Onego ecosystem, substantial emissions of carbon dioxide from this lake into the atmosphere can be assumed. However, the extent of this phenomenon is still poorly known. As a climate change has led to an increase in water and organic matter flow into the northern water bodies, the carbon balance study of aquatic ecosystems is of particular relevance. The elements of the water balance for the Lake Onego catchment area in the current climate conditions are assessed. Based on satellite images the model of Lake Onego watershed terrestrial ecosystems is used to simulate the flow of organic matter into the lake with different types of vegetation and topography consideration. The assessment of the benthic communities habitat is carried out taking into account the accumulation of organic matter in various parts of Lake Onego.
геоинФормационнаЯ модель наЗемныХ ЭКосисТем ПриБеломорсКой ниЗменносТи П. Ю. литинский Институт леса Карельского научного центра РАНПриводятся результаты создания геоинформационной модели наземных экосис-тем прибеломорской низменности методом моделирования спектрального про-странства снимков Landsat. Установлено, что спектральная модель четко отражает естественную структуру растительного покрова, определяемую типом четвертич-ных отложений и условиями водно-минерального питания. Применена усовер-шенствованная методика 3D-визуализации спектральной модели, которая позво-лила выявить несколько классов заболоченных сосняков и типов болот низменнос-ти. Описываемый фрагмент завершает первый этап создания геоинформационной модели наземных экосистем северотаежной подзоны Восточной Фенноскандии. Принципиальное отличие данной модели от созданных традиционными метода-ми «классификации с обучением» заключается в том, что результат определяется в первую очередь не количеством наземных ключевых участков, выбор которых в той или иной степени субъективен, а от объективного, измеряемого биофизичес-кого параметра -положения экосистемы в спектральном пространстве сканерно-го снимка.К л ю ч е в ы е с л о в а: геоинформационное моделирование; таежные экосистемы; дистанционное зондирование; четвертичные отложения. P. Yu. Litinsky. GEOGRAPHICAL INFORMATION MODEL OF TERRESTRIAL ECOSYSTEMS OF THE WHITE SEA LOWLANDThe results of building the geoinformation model of terrestrial ecosystems by Landsat spectral space modeling are reported. The spectral space model accurately reflects the natural structure of the forest and mire cover, which is related to the type of Quaternary deposits and the type of water and mineral nutrition. An enhanced technique for 3D visualization of the spectral model was applied, allowing to identify several classes of paludified pine forests and types of mires in the lowland. The fragment described in the paper completes the first phase of building the geoinformation model of terrestrial ecosystems of the north-taiga subzone of Eastern Fennoscandia. The fundamental difference of this model from the traditional ones, generated by methods of "supervised classification", is that instead of the number of key sites on the ground, chosen more or less subjectively, the result here depends on an objective, measurable biophysical parameter, i. e. the position of the ecosystem in the spectral space of the scanner image.K e y w o r d s: geographical information modeling; boreal ecosystems; remote sensing; Quaternary deposits.
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