Retention and Uptake by Plants of Added Selenium in Peat Soils

作者：Keskinen Riikka^*; Yli Halla Markku; Hartikainen Helina

来源：Communications in Soil Science and Plant Analysis, 2013, 44(22): 3465-3482.

DOI：10.1080/00103624.2013.847955

• Adsorption
• fertilization
• selenate
• selenite
• selenium
• plant uptake

In soil, adsorption of selenium (Se) onto mineral surfaces is accompanied by poorly known retention via organic matter. The effects of these components on the availability of Se were examined in two pot experiments. Spring wheat was grown with increasing amounts of selenate (SeO42-) in one sand and three peat soils, and ryegrass with selenate and selenite (SeO32-) in sphagnum peat manipulated by iron (Fe) hydroxide. Selenate persisted in soluble form, whereas selenite was fixed in the soil. In wheat, 5-50% of the selenate addition was recovered in the plant, the proportion increasing with increasing Se. In ryegrass, 30-40% of the added selenate but less than 2% of the selenite was found within the leaves. The Fe hydroxide enrichment enhanced the selenite uptake. Phosphate buffer desorbed a minor proportion of the added selenite, except in peat amply enriched with Fe hydroxide. The results suggest that the retention mechanism of selenite was changed due to the hydroxide amendment.

• 出版日期2013-12-16