Radiocaesium bioavailability to flooded paddy rice is related to soil solution radiocaesium and potassium concentrations

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Radiocaesium bioavailability to flooded paddy rice is related to soil solution radiocaesium and potassium concentrations. / Uematsu, Shinichiro; Vandenhove, Hildegarde; Sweeck, Lieve; Van Hees, May; Smolders, E.

In: Plant and Soil, Vol. 428, No. 1-2, 01.07.2018, p. 415–426.

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@article{cd00b886fb0b4105b6d5bf1b63b863bf,
title = "Radiocaesium bioavailability to flooded paddy rice is related to soil solution radiocaesium and potassium concentrations",
abstract = "This study was established to better understand the mechanisms of the variable radiocaesium bioavailability observed in flooded rice. Paddy topsoils (n = 9) with contrasting soil properties were collected from the Fukushima-accident affected area, spiked with 134Cs and cropped in the greenhouse with rice under flooded conditions. Soil solution was collected. As a reference to earlier work, we cropped the same paddy soils and additional grassland soils (n = 22 in total) with ryegrass under unsaturated conditions. Rice shoot 134Cs concentrations varied 110-fold among soils and were unrelated to soil solution 134Cs concentrations. However, the rice shoot 134Cs concentrations clearly increased with the soil solution 134Cs:K concentration ratio (R2 = 0.79; P <0.001). The same trend was true for ryegrass shoot 134Cs concentrations, which were, on average, 4.1-fold larger than those for flooded rice at an equal soil solution 134Cs:K ratio. Soil solution radiocaesium and K concentrations explain the radiocaesium bioavailability to flooded rice, confirming established knowledge for ryegrass. Transport modelling suggests that the overall smaller 134Cs bioavailability to flooded rice than to ryegrass in unsaturated soils is related to the smaller K uptake rate of rice, alleviating K depletion in its rhizosphere with locally higher K+, blocking the root uptake of radiocaesium.",
keywords = "Soil-to-plant radiocaesium transfer, Paddy rice, Fukushima accident affected area, root uptake, solid-liquid distribution, soil solution",
author = "Shinichiro Uematsu and Hildegarde Vandenhove and Lieve Sweeck and {Van Hees}, May and E. Smolders",
note = "Score=10",
year = "2018",
month = "7",
day = "1",
doi = "10.1007/s11104-018-3686-6",
language = "English",
volume = "428",
pages = "415–426",
journal = "Plant and Soil",
issn = "0032-079X",
publisher = "Springer",
number = "1-2",

}

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TY - JOUR

T1 - Radiocaesium bioavailability to flooded paddy rice is related to soil solution radiocaesium and potassium concentrations

AU - Uematsu, Shinichiro

AU - Vandenhove, Hildegarde

AU - Sweeck, Lieve

AU - Van Hees, May

AU - Smolders, E.

N1 - Score=10

PY - 2018/7/1

Y1 - 2018/7/1

N2 - This study was established to better understand the mechanisms of the variable radiocaesium bioavailability observed in flooded rice. Paddy topsoils (n = 9) with contrasting soil properties were collected from the Fukushima-accident affected area, spiked with 134Cs and cropped in the greenhouse with rice under flooded conditions. Soil solution was collected. As a reference to earlier work, we cropped the same paddy soils and additional grassland soils (n = 22 in total) with ryegrass under unsaturated conditions. Rice shoot 134Cs concentrations varied 110-fold among soils and were unrelated to soil solution 134Cs concentrations. However, the rice shoot 134Cs concentrations clearly increased with the soil solution 134Cs:K concentration ratio (R2 = 0.79; P <0.001). The same trend was true for ryegrass shoot 134Cs concentrations, which were, on average, 4.1-fold larger than those for flooded rice at an equal soil solution 134Cs:K ratio. Soil solution radiocaesium and K concentrations explain the radiocaesium bioavailability to flooded rice, confirming established knowledge for ryegrass. Transport modelling suggests that the overall smaller 134Cs bioavailability to flooded rice than to ryegrass in unsaturated soils is related to the smaller K uptake rate of rice, alleviating K depletion in its rhizosphere with locally higher K+, blocking the root uptake of radiocaesium.

AB - This study was established to better understand the mechanisms of the variable radiocaesium bioavailability observed in flooded rice. Paddy topsoils (n = 9) with contrasting soil properties were collected from the Fukushima-accident affected area, spiked with 134Cs and cropped in the greenhouse with rice under flooded conditions. Soil solution was collected. As a reference to earlier work, we cropped the same paddy soils and additional grassland soils (n = 22 in total) with ryegrass under unsaturated conditions. Rice shoot 134Cs concentrations varied 110-fold among soils and were unrelated to soil solution 134Cs concentrations. However, the rice shoot 134Cs concentrations clearly increased with the soil solution 134Cs:K concentration ratio (R2 = 0.79; P <0.001). The same trend was true for ryegrass shoot 134Cs concentrations, which were, on average, 4.1-fold larger than those for flooded rice at an equal soil solution 134Cs:K ratio. Soil solution radiocaesium and K concentrations explain the radiocaesium bioavailability to flooded rice, confirming established knowledge for ryegrass. Transport modelling suggests that the overall smaller 134Cs bioavailability to flooded rice than to ryegrass in unsaturated soils is related to the smaller K uptake rate of rice, alleviating K depletion in its rhizosphere with locally higher K+, blocking the root uptake of radiocaesium.

KW - Soil-to-plant radiocaesium transfer

KW - Paddy rice

KW - Fukushima accident affected area

KW - root uptake

KW - solid-liquid distribution

KW - soil solution

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/29806026

U2 - 10.1007/s11104-018-3686-6

DO - 10.1007/s11104-018-3686-6

M3 - Article

VL - 428

SP - 415

EP - 426

JO - Plant and Soil

JF - Plant and Soil

SN - 0032-079X

IS - 1-2

ER -

ID: 4186211