Temporal variation in physiological conditions of larch tree at taiga forest ecosystem
Under a global warming, taiga forest ecosystem is expected to change. Tree growth decreased during warm climate (this data obtained at northeast Siberian Taiga). This means primary production may decrease in the future. In addition, it is widely accepted that soil respiration will also increase with soil temperature. The soil in taiga forest ecosystem accumulates large amount of organic matter in the soil. Therefore, it is highly possible that taiga forest ecosystem will emit CO2 rather than absorb in the future.
Main purpose of my research is to find out relationships between carbon and nitrogen isotope compositions δ13C , δ15N in larch trees and satellite-derived Normalized difference vegetation index (NDVI) at Spasskaya Pad Experimental forest . δ13C is a common proxy for water use efficiency (WUE) in plants, δ15N is a proxy for nitrogen availability from soil. Water and N availability are limiting factors for taiga forest on permafrost (water-controlled ecosystem), so they should be continuously observed. Stable isotopes of carbon and nitrogen 13C/12C and 15N/14N will be obtained from larch needles, tree ring cores samples. Also soil will be sampled for inorganic nitrogen extraction (organic matter, 0-10 cm, 10-20 cm, 20-50 cm depth). NDVI reflects the density of green on a patch of land (photosynthetic activity of vegetation in the given area) and can be considered as a proxy of plant productivity. At the planned research site, more than 10-years dataset is available, therefore in my study obtained data will be compared with year to year variations of the proxies.
ノゴビチン アレクサンダー (サシヤ)
IXth International symposium “C/H2O/Energy balance and climate over the boreal and Arctic regions with special emphasis on Eastern Eurasia” 1-4 November 2016, Yakutsk, Russia:
1. Gavrilieva T., Bochkarev N., Nogovytsyn A. The impact of modernization of housing and utilities sector of the Republic of Sakha (Yakutia) on the dynamics of carbon emissions [oral]
2. Nogovytsyn A. Analysis of the effectiveness of energy conservation measures undertaken in the Republic of Sakha (Yakutia), in terms of carbon emissions [oral]
1. Gavrilieva T.N., Nogovitcyn A.V. (2016) The impact of energy saving state programs on the dynamics of carbon emission in the Republic of Sakha (Yakutia). The Arctic. XXI century. № 1(4). Pp. 29-42
2. Gavrilyeva T., Petrov N., Nogovitcyn A., Pavlov N. (2018) Greenhouse Gas Emissions in Yakutia: a Retrospective Analysis Based on Fuel and Energy Balance Data. EKO. Pp. 118-135. DOI: 10.30680/ЕСО0131-7652-2018-7-118-135
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