NDLI: Depletion of Selenium in Soil Solution due to its Enhanced Sorption in the Rhizosphere of Soybean

Content Provider	Springer Nature Link
Author	Nakamaru, Y. Tagami, K. Uchida, S.
Copyright Year	2005
Abstract	The effect of plant roots on selenium (Se) mobility in soil was studied by a large-scale pot experiment in order to understand the environmental behavior of Se in agricultural soils under plant growth conditions. Soybean plants (Glycine max (L.) Merrill) were grown in a greenhouse for 84 d. The concentrations of Se and major elements (K, Ca, Mg, Na, and Al) in the soil solutions and in the plants were measured at different growth periods. Concentrations of Se and major cations in soil solution decreased as the soybean plants grew, while the concentrations of Al increased. It was assumed that the soybean roots released H$^{+}$ with the uptake of cations; consequently, due to the acidification of the rhizosphere, Al$^{3+}$ was released starting from the soil solid phase. The decreased Se concentration in the soil solution should be due to the enhancement of Se sorption onto the soil solid phase. The increase of Se sorption level in the rhizosphere was examined in a small-scale pot experiment. The soil–soil solution distribution coefficient of Se (K $_{d}$-Se) was observed as an index of Se sorption level. K $_{d}$-Se clearly increased in the rhizosphere soil after cultivation. The effects of pH and Al$^{3+}$ in the rhizosphere on Se sorption were assessed by K $_{d}$-Se measurements at different levels of HCl and AlCl$_{3}$. In this third experiment, a decrease in pH increased K $_{d}$-Se values, but no specific effect was observed on Se sorption due to increased Al$^{3+}$. These results show that the Se mobility in agricultural soil could be decreased by plant roots under plant growth conditions due to enhanced Se sorption in the rhizosphere.
Starting Page	293
Ending Page	301
Page Count	9
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	278
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2005-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	acidification exchangeable aluminum rhizosphere selenium soil solution Plant Sciences Ecology Plant Physiology Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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