| Autor: |
Komissarova, O. L., Paramonova, T. A., Kuzmenkova, N. V., Turykin, L. A., Pavlov, K. V., Shcheglov, A. I. |
| Zdroj: |
Moscow University Soil Science Bulletin; Dec2022, Vol. 77 Issue 4, p227-236, 10p |
| Abstrakt: |
The behavior of 137Cs and K in the soil–plant system of the Chernozemic Zone long after the Chernobyl accident was studied. Experimental plots were laid in the central part of Plavsk radioactive hotspot of Tula oblast in wheat, soybean, buckwheat, rapeseed, sunflower, and grass–legume agrocenoses and in natural biogeocenoses of a dry meadow. The mean soil contamination with 137Cs was 171 ± 26 kBq/m2 (498 ± 100 Bq/kg), and the mean content of total K in soils was 2.0 ± 0 1%, including 235 ± 54 mg/kg of exchangeable K and 816 ± 116 mg/kg of nonexchangeable K. Vertical distribution of 137Cs within the contaminated 30-cm-thick soil layer of agrocenoses and of the total K was uniformly accumulative in all the soils, while the distribution of exchangeable and nonexchangeable K was regressive–accumulative. The microdistribution was invariant for 137Cs in the root zone, and gradient enrichment of soil near the root surface was detected for mobile forms of potassium. The intensity of 137Cs transfer from soils to plants for all studied crops was from one to two orders of magnitude lower than the intensity of K uptake by roots. The distribution of elements between plant organs also differed. The 137Cs distribution was acropetal for cereals and basipetal for crops of other families, and K was distributed basipetally in all tested plants. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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