Accumulation of ¹³⁷Cs by ecological groups of coastal-aquatic vegetation of floodplain meadows of the Sozh river

The purpose of the study is to identify differences in the content of ¹³⁷Cs in the phytomass of coastal aquatic vegetation of the Vetka and Chechersk districts of the Gomel region for the period 2012–2022. The description and identification of ecological groups of coastal aquatic vegetation and the sampling of soil and plants to determine the content of radiocesium in the growing seasons of 2012 and 2022 were carried out according to generally accepted methods. It was found that the content of ¹³⁷Cs in water samples from the objects of Vetka district did not exceed the normative value for drinking water (10 Bq/kg). The average specific activity of radiocesium in the soil for the studied objects was 807±125 and 586±84 Bq/kg in 2012 and 2022, respectively; and for soil was 549±85 and 395±46 Bq/kg respectively. Over time, there was a decrease in the amount of radiocesium in soil and in ground by 1.3–1.4 times. The average content of the isotope in the plants in 2012 and 2022 was 93–917 and 59–578 Bq/kg, respectively. The amplitude of variation in the average values of accumulation coefficient in the soil-plant system was 1.03 and 0.11 Bq/kg:Bq/kg in 2012 and 2022, respectively. In the ground-plant system it was 3.08 and 0.01 Bq/kg:Bq/kg, respectively. The specific activity of ¹³⁷Cs in the water of objects in the Chechersk region did not exceed 3 Bq/l. The average content of ¹³⁷Cs in the ground was 316 and 231 Bq/kg in 2012 and 2022, respectively. The same parameters for the soil were within the limits of 471 and 340 Bq/kg, respectively. The average content of ¹³⁷Cs in phytomass varied from 149 to 483 Bq/kg in 2012. After 10 years, the amount of radionuclide was 115–288 Bq/kg. The average values of accumulation coefficient in the soil-plant system in 2012 and 2022 were 1.44 and 1.01 Bq/kg:Bq/kg, and in the soil-plant system were 1.70 and 1.10 Bq/kg:Bq/kg, respectively. As a result of the study, similar dominant groups of coastal aquatic plants were not identified in terms of the accumulation of radiocesium in the objects of the Vetka and Chechersk regions.

1. Recommendations for the improvement of upland and lowland meadows exposed to radioactive contamination. Ed. IM Bogdevich. Minsk; 2004. 69 p. (In Russian).

2. Sapegin LM, Daineko NM, Timofeev SF. Ecological and floristic characteristics and productivity of meadow ecosystems of the floodplain of the river. Sozh and the suburbs of the city of Gomel. Floodplain meadow ecosystems as objects with high phytodiversity, their study and mapping: Proceedings of the Intern. scientific-practical. seminar, Gomel, June 11-12, 2009 / ed.: LM Sapegin (responsible ed.) et al. Gomel: GSU im. F. Skorina; 2009. P. 13-25. (In Russian).

3. Podolyak AG, Bogdevich IM, Ivashkova II. Forecasting the accumulation of 137Cs and 90Sr in the grass stands of the main types of meadows of the Belarusian woodland according to the agrochemical properties of soils. Vestsі natsyyanalnay akademіі navuk Belarusі = Vests of the National Academy of Sciences of Belarus. 2007;3: 54-62. (In Russian).

4. Demina MI, Solovyov AV, Chechetkina NV. Geobotany with the basics of plant ecology and geography: a textbook. Moscow: FGBOU V PORGAZU; 2013. 148 p. (In Russian).

5. Sadchikov AP, Kudryashov MA. Ecology of coastal aquatic vegetation (textbook for university students). Moscow: Publishing house NIA-Priroda, REFIA; 2004. 220 p. (In Russian).

6. Daineko NM, Timofeev SF. Composition and structure of floodplain meadows of the river basin. Sozh. Monograph. Chernihiv: Desna Polygraph; 2020. 208 p. (In Russian).

7. Daineko NM, Timofeev SF. Radioactive contamination of medicinal plants in some areas of the Gomel region, bordering with the territory of the Bryansk region of Russia. Radiatsionnaya Gygiena = Radiation Hygiene. 2009;2(9): 57 – 63. (In Russian).

8. Sharipova OA. The content of radionuclides in the bottom sediments of Lake Balkhash. Gidrometeorologiya i ekologiya = Hydrometeorology and ecology. 2012;4:101-105. (In Russian).

9. Kiselev GP, Yakovlev EYu, Druzhinin SV, Kiseleva IM, Bazhenov AV, Bykov VM. Natural and technogenic radioactivity of bottom sediments of lakes in the north-west of Russia (on the example of the Republic of Karelia and the Arkhangelsk region). Uspekhi sovremennogo estestvoznaniya = Successes of modern natural sciences. 2017;12: 152-157. (In Russian).

10. Borisenko GS. The content of radionuclides in coastal bottom sediments of the Amur Bay (Sea of Japan). Fundamentalnye issledovaniya = Fundamental Research. 2006;8: 26-26. (In Russian).

11. Nikitin AN, Zubareva AV, Shurankova DV, Sukhareva OA. Distribution of long-lived radionuclides in closed water bodies at the stage of remote consequences of the catastrophe at the Chernobyl nuclear power plant. Sakharov Readings 2018: Environmental Problems of the 21st Century. Proceedings of the 18th International Scientific Conference, May 17–18, 2018, Minsk, Republic of Belarus: at 3 pm / International. state ecol. in-t im. A.D. Sakharova Bel. state university. Minsk: Information Center of the Ministry of Finance; 2018. Part 2. P. 228-229. (In Russian).

12. Kaigorodov RV. Distribution of technogenic radionuclides 137Cs and 90Sr in the components of aquatic ecosystems of the Tyumen region. Uspekhi sovremennogo estestvoznaniya = Successes of modern natural sciences. 2021;11: 64-69. (In Russian).

13. Methods of field geobotanical research. Moscow, Leningrad: Publishing House of the Academy of Sciences of the USSR; 1938. 215 p. (In Russian).

14. Program and methodology of biogeocenological research. Moscow: Nauka; 1974. 404 p. (In Russian).

15. Radioactive contamination of vegetation in Belarus (due to the accident at the Chernobyl nuclear power plant). Minsk; 1995. 582 p. (In Russian).

16. Sapegin LM, Daineko NM. Economic typology of floodplain meadows of Belarusian Polissya. Study and conservation of floodplain meadows: proceedings of the International meeting, Kaluga, June 26-28, 2013. Kaluga: LLC “Noosphere”; 2013. P. 53 – 58. (In Russian).

17. Gigevich GS, Vlasov BP, Vynaev GV. Higher aquatic plants of Belarus: ecological and biological characteristics, use and protection. Minsk: BGU; 2001. 230 p. (In Russian).

18. Determinant of higher plants of Belarus. Ed. VI Parfenov. Minsk: Design PRO; 1999. 472 p. (In Russian).