Soil-fungi transfer coefficients:: Importance of the location of mycelium in soil and of the differential availability of radionuclides in soil fractions
Soil-fungi transfer coefficients:: Importance of the location of mycelium in soil and of the differential availability of radionuclides in soil fractions
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DOI：
10.1016/j.jenvrad.2004.12.006
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发表时间：
2005-01-01
影响因子：
2.3
通讯作者：
Bernedo, JM
中科院分区：
文献类型：
--
作者：
Baeza, A;Guillén, J;Bernedo, JM
土壤-真菌迁移系数通常定义为子实体含量与土壤含量之比。然而，由于如何确定土壤含量的方法还没有确定下来，文献中存在着各种定义。我们分析了来自西班牙两个松林生态系统的蘑菇和土壤样品中Cs-137、Sr-90、K-40和Ra-226的含量。菌丝在这些生态系统的土壤剖面中的位置是通过麦角甾醇浓度来确定的。结果表明，菌丝一般分布在土壤表层(0~5 cm)。我们还对这一层土壤进行了形态形成程序，以确定土壤中放射性核素的不同结合程度。这一结果使我们对用于量化放射性核素转移的传统定义提出了一些变化。通过这些修改，我们能够分析几种菌根和腐生真菌中的Cs-K竞争。(C)2005爱思唯尔有限公司。保留所有权利。
Soil-fungus transfer coefficients are usually defined as the ratio between the content of the fruiting bodies and that of the soil. Since, however, the methodology of how to determine the soil content is not firmly established, there exist a variety of definitions in the literature. We analyzed the Cs-137, Sr-90, K-40, and Ra-226 content of mushroom and soil samples from two pine-wood ecosystems in Spain. The location of the mycelium, in the soil profiles of these ecosystems was determined by means of the ergosterol concentration. The results showed the mycelium to generally be localized in the surface layer of soil (0-5 cm). We also carried out a speciation procedure for this layer of soil to determine the different degrees of association of the radionuclides in the soil. The results led us to propose some variations to the traditional definition used in quantifying radionuclide transfer. With these modifications, we were able to analyze Cs-K competition in several species of mycorrhizal and saprophytic fungi. (c) 2005 Elsevier Ltd. All rights reserved.