Component Elements of the Carbon Cycle in the Middle and Lower Yenisei River Ecosystem
A. P. TOLOMEEV1, O. V. ANISCHENKO1, E. S. KRAVCHUK1, O. V. KOLMAKOVA1,2, L. A. GLUSCHENKO2, O. N. MAHUTOVA1, A. A. KOLMAKOVA1, V. I. KOLMAKOV1,2, M. Yu. TRUSOVA1, N. N. SUSCHIK1,2, M. I. GLADISCHEV1,2
1Institute of Biophysics SB RAS, 660036, Krasnoyarsk, Akademgorodok
2Siberian Federal University, 660041, Krasnoyarsk, Svobodniy ave., 79
Keywords: Yenisei River, the carbon cycle, nutrients, primary production, respiration, phytoplankton, bacterioplankton
Abstract
Integrated studies of middle and lower Yenisei were performed in the summer of 2012. The studies included monitoring of the most important elements and ecological processes associated with the carbon cycle of the river ecosystem ( the study area was more than 1800 km). The measurements of production and decomposition processes showed inconsistency of the hypothesis of “neutral tube”, considering the river as a simple drain of carbon from terrestrial ecosystems to the ocean. The Yenisei River is not a pure heterotrophic ecosystem, it has a positive balance of photosynthesis and respiration (above Angara river and in the region of Bolshaya and Malaya Heta rivers). According to the study, the respiration rate of the plankton community of the river primarily depends on the water temperature and the content of inorganic phosphorus, the lack of which in many ecosystems limits the consumption of organic matter by bacterioplankton.
|
