Long-term effects of single potassium fertilization on 137Cs levels in plants and fungi in a boreal forest ecosystem

Correlations between potassium, rubidium and cesium (133Cs and 137Cs) in sporocarps of Suillus variegatus in a Swedish boreal forest

“…addition, radiocesium transport by arbuscular mycorrhizal (AM) fungi decreases if there is increased K concentration in a compartment accessible only to AM (Gyuricza et al, 2010) and, a higher Cs:K ratio in the nutrient solution increases uptake of Cs by ectomycorrhizal seedlings (Brunner et al, 1996). A noticeable (20e60%) and long-lasting (at least 17 years) reduction in 133 Cs activity concentration in fungal sporocarps due to a single K fertilization of 100 kg ha À1 in a Scots pine forest is reported by Rosén et al (2011). The relation between 137 Cs and K and, Rb and 133 Cs within S. variegatus was similar to an earlier report on different species of fungi (Yoshida and Muramatsu, 1998).…”

Cesium (137Cs and 133Cs), Potassium and Rubidium in Macromycete Fungi and Sphagnum Plants

“…The absence of correlation between 137 C (or 133 Cs) and K in fungi may be due to the incorporation of K being self-regulated by the nutritional requirements of the fungus, whereas, incorporation of 137 Cs is not self-regulated by the fungus (Baeza et al, 2004 (Gyuricza et al, 2010), and a higher Cs:K ratio in the nutrient solution increases uptake of Cs by ectomycorrhizal seedlings (Brunner et al, 1996). A noticeable (20-60%) and long-lasting (at least 17 years) reduction in 133 Cs activity concentration in fungal sporocarps in situ due to a single K fertilization of 100 kg ha −1 in a Scots pine forest is reported by Rosén et al, (2011). The relation between 137 Cs and K, and Rb and 133 Cs within S. variegatus (Figure 2) was similar to an earlier report on different species of fungi (Yoshida & Muramatsu, 1998).…”

“…The 137 Cs activity concentration in edible fungi species has not decreased over the last 20 years (Suillus variegatus) or significantly increased (Cantharellus spp.) (Mascanzoni, 2009;Rosén et al, 2011). 282 bioavailable fraction of soils within forest ecosystems is reported Karadeniz & Yaprak (2007) but in cultivated soils, equilibrium between fallout 137 Cs and stable 133 Cs among exchangeable, organic bound and strongly bound fractions has not reached, even though most 137 Cs was deposited on the soils more than 20 years before (Tsukada, 2006).…”

Long-term effect of fertilization on137Cs concentration in Scots pine needles

“…In several field experiments significant decrease in uptake of radiocaesium by trees and understorey vegetation has followed soil preparation and fertilisation [1][2][3][4][5][6][7][8][9]. For example, the activity concentration of 137 Cs in certain compartments of trees has decreased to as low as ten per cent of the content in unfertilised stands, depending on dosage and time after the treatment.…”