Dynamics of vegetation productivity in floodplain meadows of the Mongun-Taiginsky district of the Republic of Tyva according to Terra Modis data
E. Yu. Zhukova1, I. N. Barsukova2,3, A. A. Zhukov1
1Katanov Khakass State University, Abakan, Russia
2Katanov Khakass State University, Novosibirsk, Russia
3Central Siberian Botanical Garden SB RAS
Keywords: productivity, evapotranspiration, Terra MODIS, meadows, Mongun-Taiga
Abstract
The results of studies of the dynamics of productivity, photosynthetically active radiation and evapotranspiration according to Terra Modis data for 5 test plots in the near-channel part of the floodplains of the Kargy river (a glycophyte, a swampy valley and a valley meadows), as well as willow thickets along the banks of the Mugur river, are presented. Analysis of long-term changes in meadow vegetation from 2000 to 2021 in the study area showed a general positive trend in gross productivity and differences between communities. Against the background of an increase in actual evapotranspiration (by 43 %), there is a decrease in potential (by 10 %), which indicated the drying up of the study area. Seasonal maxima of meadow productivity were observed in 2014, 2016 and 2020-2021. The years 2001, 2003-2004, and 2009 turned out to be critical for meadow vegetation. A weak positive correlation was found between the gross productivity of vegetation and the evapotranspiration of the territory, and a stronger one with photosynthetically active radiation. The seasonal dynamics of productivity corresponded to the meadow type of vegetation.
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