Uranium distribution and cycling in Scots pine (Pinus sylvestris L.) growing on a revegetated U-mining heap

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Uranium distribution and cycling in Scots pine (Pinus sylvestris L.) growing on a revegetated U-mining heap. / Thiry, Yves; Van Hees, May; Wannijn, Jean; Van Bree, Peter; Vandenhove, Hildegarde; Rufyikiri, Gervais; Schmidt, Peter; Vanmarcke, Hans (Peer reviewer).

In: Journal of environmental radioactivity, Vol. 81, No. 2-3, 04.2005, p. 201-219.

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@article{0b20deae0ca44b9e8cf07f6820ba2440,
title = "Uranium distribution and cycling in Scots pine (Pinus sylvestris L.) growing on a revegetated U-mining heap",
abstract = "We determined the uranium distribution in soil and its allocation in compartments of 35-year-old Scots pine developed on a revegetated U-mining heap. The processes controlling the dynamics of U recycling were identified and further quantified in terms of annual fluxes. As pine developed, an acid humus layer emerged leading to weathering of the alkaline mining debris but this had little effect on U mobility in the soil profile. Increased U mobility mainly involved a translocation of U to metal-humus chelates in surface layers. The root compartment accounted for 99.3% of the U budget in tree, thus serving as an effective barrier which restricts U uptake. The current root uptake and transfer of U to upper parts of the tree amounted to about 3 g ha−1 y−1, i.e. less than 0.03% of the current NH4-exchangeable U pool in the soil (0–30 cm). Allocation and translocation pattern made it clear that a dominant fraction of the translocated U moves passively with the ascent xylem sap, most likely as a soluble complex, and steadily accumulates in the needles. Consequently, 97% of the U annual uptake is returned to the soil through litterfall. At the studied site, the risk of U dissemination due to biomass turnover or trunk harvest was low when considered in relation to the current “exemption level” for U.",
keywords = "Biological cycling, Phytostabilisation, Mining sites, Remediation",
author = "Yves Thiry and {Van Hees}, May and Jean Wannijn and {Van Bree}, Peter and Hildegarde Vandenhove and Gervais Rufyikiri and Peter Schmidt and Hans Vanmarcke",
note = "Score = 10",
year = "2005",
month = apr,
doi = "10.1016/j.jenvrad.2004.01.036",
language = "English",
volume = "81",
pages = "201--219",
journal = "Journal of environmental radioactivity",
issn = "0265-931X",
publisher = "Elsevier",
number = "2-3",

}

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TY - JOUR

T1 - Uranium distribution and cycling in Scots pine (Pinus sylvestris L.) growing on a revegetated U-mining heap

AU - Thiry, Yves

AU - Van Hees, May

AU - Wannijn, Jean

AU - Van Bree, Peter

AU - Vandenhove, Hildegarde

AU - Rufyikiri, Gervais

AU - Schmidt, Peter

A2 - Vanmarcke, Hans

N1 - Score = 10

PY - 2005/4

Y1 - 2005/4

N2 - We determined the uranium distribution in soil and its allocation in compartments of 35-year-old Scots pine developed on a revegetated U-mining heap. The processes controlling the dynamics of U recycling were identified and further quantified in terms of annual fluxes. As pine developed, an acid humus layer emerged leading to weathering of the alkaline mining debris but this had little effect on U mobility in the soil profile. Increased U mobility mainly involved a translocation of U to metal-humus chelates in surface layers. The root compartment accounted for 99.3% of the U budget in tree, thus serving as an effective barrier which restricts U uptake. The current root uptake and transfer of U to upper parts of the tree amounted to about 3 g ha−1 y−1, i.e. less than 0.03% of the current NH4-exchangeable U pool in the soil (0–30 cm). Allocation and translocation pattern made it clear that a dominant fraction of the translocated U moves passively with the ascent xylem sap, most likely as a soluble complex, and steadily accumulates in the needles. Consequently, 97% of the U annual uptake is returned to the soil through litterfall. At the studied site, the risk of U dissemination due to biomass turnover or trunk harvest was low when considered in relation to the current “exemption level” for U.

AB - We determined the uranium distribution in soil and its allocation in compartments of 35-year-old Scots pine developed on a revegetated U-mining heap. The processes controlling the dynamics of U recycling were identified and further quantified in terms of annual fluxes. As pine developed, an acid humus layer emerged leading to weathering of the alkaline mining debris but this had little effect on U mobility in the soil profile. Increased U mobility mainly involved a translocation of U to metal-humus chelates in surface layers. The root compartment accounted for 99.3% of the U budget in tree, thus serving as an effective barrier which restricts U uptake. The current root uptake and transfer of U to upper parts of the tree amounted to about 3 g ha−1 y−1, i.e. less than 0.03% of the current NH4-exchangeable U pool in the soil (0–30 cm). Allocation and translocation pattern made it clear that a dominant fraction of the translocated U moves passively with the ascent xylem sap, most likely as a soluble complex, and steadily accumulates in the needles. Consequently, 97% of the U annual uptake is returned to the soil through litterfall. At the studied site, the risk of U dissemination due to biomass turnover or trunk harvest was low when considered in relation to the current “exemption level” for U.

KW - Biological cycling

KW - Phytostabilisation

KW - Mining sites

KW - Remediation

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/ezp_27151

U2 - 10.1016/j.jenvrad.2004.01.036

DO - 10.1016/j.jenvrad.2004.01.036

M3 - Article

VL - 81

SP - 201

EP - 219

JO - Journal of environmental radioactivity

JF - Journal of environmental radioactivity

SN - 0265-931X

IS - 2-3

ER -

ID: 348844