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Analysis of the gas exchange and water balance in a closed experimental model of the artificial ecosystem intended for an estimated portion of a human / S. Ushakova [et al.] // Acta Astronaut. - 2018, DOI 10.1016/j.actaastro.2018.07.022 . - ISSN 0094-5765
Кл.слова (ненормированные):
Experimental model of a closed ecological system -- Higher plant community -- Human respiratory function -- Water balance -- СО2 and О2 gas exchange -- Carbon dioxide -- Evapotranspiration -- Closed ecological systems -- Gas exchange -- Higher plants -- Respiratory function -- Water balance -- Ecosystems
Аннотация: This study was performed to investigate water and gas exchange in the experimental model of a closed ecological system (CES) intended for an estimated portion of a human in the long-duration (several-month) experiment. The diversity of the vegetable conveyor in the system was increased. Human wastes were involved in mass exchange processes, and human respiratory function was periodically connected to the experimental model of a CES. The experimental model of a CES was used to quantify regeneration of the gaseous atmosphere with oxygen and carbon dioxide loops by linking the photosynthesizing compartment with the heterotrophic compartment (soil-like substrate) and by the periodic connection of the human respiratory function. Under the preset light and temperature conditions, atmospheric CO2 concentration in the CES model intended for a portion of a human was maintained at a level that neither limited photosynthetic processes nor was harmful to humans (800–2000 ppm) during the 154-day experiment. At the same time, O2 concentration did not either drop below 20.8% or rise above 22.6%. The amount of the evapotranspiration water collected in the system could satisfy 50% of the daily water requirement of a human (with all the water used and excreted by the human being processed and used to irrigate plants). The evapotranspiration water did not need to be additionally purified before being used by humans. Thus, in the experimental model of the closed ecological system, human oxygen and food requirements (per 0.05 portion of a human) were matched to the function of the heterotrophic compartment and the photosynthesizing activity of the multispecies uneven-aged higher plant community. © 2018 IAA

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Держатели документа:
Institute of Biophysics SB RAS, Federal Research Center “Krasnoyarsk Science Center SB RAS”, 50/50 Akademgorodok, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Ushakova, S.; Tikhomirova, N.; Velichko, V.; Trifonov, S.; Morozov, Y.; Kalacheva, G.; Pavlova, A.; Tikhomirov, A.

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The effect of supplementation of the soil-like substrate with wheat straw mineralized to different degrees on wheat productivity in closed ecosystems / V. V. Velichko, A. A. Tikhomirov, S. A. Ushakova [et al.] // Life Sci. Space Res. - 2020. - Vol. 26. - P132-139, DOI 10.1016/j.lssr.2020.06.001 . - ISSN 2214-5524
Кл.слова (ненормированные):
Biological-technical human life support system -- Physicochemical mineralization of straw -- Soil-like substrate -- Wheat (Triticum aestivum L) -- hydrogen peroxide -- alternating current -- aqueous solution -- Article -- controlled study -- electric current -- evapotranspiration -- grain yield -- growing season -- harvest index -- irrigation (agriculture) -- macronutrient -- microclimate -- mineralization -- nitrogen concentration -- nutrient availability -- nutrient solution -- oxidation -- physical chemistry -- plant development -- plant growth -- priority journal -- sediment -- shoot -- soil like substrate -- soil treatment -- spikelet -- supernatant -- Triticum aestivum
Аннотация: Successful incorporation of soil-like substrate (SLS) into biotechnical life support systems is often complicated by the necessity to maintain the balance between flows of mineral elements taken up from the substrate by growing plants and mineral elements added to the SLS as components of mineralized plant inedible biomass. An imbalance between these two flows can be caused by the addition of recalcitrant plant waste such as wheat straw. The purpose of this study was to determine whether the availability of essential nutrients to be taken up by the roots of the wheat plants grown on the SLS could be enhanced by supplementing the SLS with the products derived from wheat straw subjected to different levels of physicochemical mineralization in the aqueous solution of hydrogen peroxide. Different degrees of straw mineralization were achieved by using different ratios of the aqueous solution of hydrogen peroxide to straw. The study showed that supplementation of the SLS with insufficiently oxidized products of physicochemical mineralization of straw resulted in a decrease in the grain yields. The inhibitory effect of the straw subjected to physicochemical oxidation increased with a decrease in the degree to which the straw had been oxidized. Only supplementation with the straw mineralized to the highest possible degree did not inhibit plant growth and development, and the crop yield in that treatment was higher than in the other treatments. © 2020

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Держатели документа:
Institute of Biophysics SB RAS, Federal Research Center “Krasnoyarsk Science Center SB RAS”, 50/50 Akademgorodok, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Velichko, V. V.; Tikhomirov, A. A.; Ushakova, S. A.; Trifonov, S. V.; Gribovskaya, I. V.

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