Downward migration of Cs-137 within the humus layer under temperate coniferous stands in the Czech Republic

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00027073%3A_____%2F18%3AN0000004" target="_blank" >RIV/00027073:_____/18:N0000004 - isvavai.cz</a>

Výsledek na webu

<a href="https://link.springer.com/article/10.1007%2Fs11368-017-1802-5" target="_blank" >https://link.springer.com/article/10.1007%2Fs11368-017-1802-5</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s11368-017-1802-5" target="_blank" >10.1007/s11368-017-1802-5</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Downward migration of Cs-137 within the humus layer under temperate coniferous stands in the Czech Republic

Popis výsledku v původním jazyce

This study examined the current distribution and downward migration of Cs-137 in the humus horizon under temperate coniferous stands in the Czech Republic. Depth distribution profiles of lithogenic alkali metals (K, Rb, and Cs) were also traced to find any indication regarding the Cs-137 dynamics within the humus horizon. Soil (bulk soil) samples were collected manually from the uppermost down to a depth of 20 cm at three points situated 10-20 m apart in three locations diversely affected by the Chernobyl accident in 1986. Humus samples (about 6 cm in thickness) were separately collected at three points adjacent to the bulk soil sampling. The humus samples were divided into three fractions (upper, middle, and lower) denoted to H-u, H-m, and H-l, respectively, depending on their depths. Activity concentration of Cs-137 and the amount of alkali metals (K, Rb, and Cs) in each humus fraction were determined with gamma spectrometry and ICP spectrometry, respectively. Some properties (pH, density, SOM, and identification of clay minerals), of both bulk soils and humus horizons were also investigated. The highest activity concentration of Cs-137 (Bq kg(-1)) appeared in the upper portion of the soil (mainly humus horizon) under three coniferous stands about 30 years after the Chernobyl accident. Increasing activity of Cs-137 (Bq) was found in the lower humus fraction (H-l, 4 similar to 6-cm depth range) with no appreciable amounts of clay minerals like illite and smectite in the investigated sites. The findings suggest that the fallout Cs-137 moves downward at a speed of 0.13 similar to 0.19 cm year(-1) with degrading organic matter within the humus horizon. Possible association of Cs-137 with alkali metals (K, Rb, and Cs) was suggested by depth distribution profiles of lithogenic alkali metals (K, Rb, and Cs) in humus. The humus horizon under temperate coniferous stands plays an important role in retaining fallout Cs-137 for a long time. Comparing the depth distributions of the fallout radionuclide Cs-137 with the depth distributions of lithogenic alkali metals (K, Rb, and Cs) gives valuable information for clarifying mechanism of Cs-137 movement in humus. Further investigation is needed to elucidate mechanism of Cs-137 migration within humus horizon by tracing Cs-137 speciation and decomposing soil organic matter simultaneously.

Název v anglickém jazyce

Downward migration of Cs-137 within the humus layer under temperate coniferous stands in the Czech Republic

Popis výsledku anglicky

This study examined the current distribution and downward migration of Cs-137 in the humus horizon under temperate coniferous stands in the Czech Republic. Depth distribution profiles of lithogenic alkali metals (K, Rb, and Cs) were also traced to find any indication regarding the Cs-137 dynamics within the humus horizon. Soil (bulk soil) samples were collected manually from the uppermost down to a depth of 20 cm at three points situated 10-20 m apart in three locations diversely affected by the Chernobyl accident in 1986. Humus samples (about 6 cm in thickness) were separately collected at three points adjacent to the bulk soil sampling. The humus samples were divided into three fractions (upper, middle, and lower) denoted to H-u, H-m, and H-l, respectively, depending on their depths. Activity concentration of Cs-137 and the amount of alkali metals (K, Rb, and Cs) in each humus fraction were determined with gamma spectrometry and ICP spectrometry, respectively. Some properties (pH, density, SOM, and identification of clay minerals), of both bulk soils and humus horizons were also investigated. The highest activity concentration of Cs-137 (Bq kg(-1)) appeared in the upper portion of the soil (mainly humus horizon) under three coniferous stands about 30 years after the Chernobyl accident. Increasing activity of Cs-137 (Bq) was found in the lower humus fraction (H-l, 4 similar to 6-cm depth range) with no appreciable amounts of clay minerals like illite and smectite in the investigated sites. The findings suggest that the fallout Cs-137 moves downward at a speed of 0.13 similar to 0.19 cm year(-1) with degrading organic matter within the humus horizon. Possible association of Cs-137 with alkali metals (K, Rb, and Cs) was suggested by depth distribution profiles of lithogenic alkali metals (K, Rb, and Cs) in humus. The humus horizon under temperate coniferous stands plays an important role in retaining fallout Cs-137 for a long time. Comparing the depth distributions of the fallout radionuclide Cs-137 with the depth distributions of lithogenic alkali metals (K, Rb, and Cs) gives valuable information for clarifying mechanism of Cs-137 movement in humus. Further investigation is needed to elucidate mechanism of Cs-137 migration within humus horizon by tracing Cs-137 speciation and decomposing soil organic matter simultaneously.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10511 - Environmental sciences (social aspects to be 5.7)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Soils and Sediments

ISSN

1439-0108

e-ISSN

1614-7480

Svazek periodika

18

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

11

Strana od-do

276–286

Kód UT WoS článku

000419164400026

EID výsledku v databázi Scopus

2-s2.0-85027378383