Seasonal variation of soil-to-plant transfer of K and fallout 134,137Cs in peatland vegetation.
Seasonal variation of soil-to-plant transfer of K and fallout 134,137Cs in peatland vegetation.
复制标题
泥炭地植被中钾和沉降物 134,137Cs 的土壤到植物转移的季节变化。
DOI：
10.1097/00004032-198910000-00011
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发表时间：
1989
期刊：
影响因子：
2.2
通讯作者：
W. Kracke
中科院分区：
文献类型：
--
作者：
K. Bunzl;W. Kracke
从1987年6月至11月，以14 d为间隔，测定了泥炭沼泽中三种植物（毛状藻、蓝毛藻、红毛藻）的~（137）Cs浓度、~（137）Cs：~（134）Cs比值和稳定K。结果表明，在生长季节，两种禾本科植物（毛丛发苔草和蓝花毛蕊花）的~（137）Cs浓度显著降低（分别为1800-240 Bq·kg ~（-1），干重4000-320 Bq·kg ~（-1））。一个非常相似的行为观察到的季节性变化的K和放射性铯在两个草种，这导致在一年中几乎恒定的比例137 Cs：K。与此相反，万年青植物Calluna vulgaris（石楠）的表面受到切尔诺贝利事故的放射性尘埃污染，1987年期间K和137 Cs的浓度相当稳定（叶片约10，000;茎约5000 Bq kg-1干重），尽管放射性铯被叶片吸收并在植物内运输。对于这两种草，植物：土壤浓度比（CR）分别获得总137 Cs，137 Cs从全球沉降物，和植物衍生的137 Cs。CR的137 Cs从全球沉降物减少毛滴虫caespitosum从春季的1.9到秋季的0.08，和来自137 Cs的1.4到0.2。对于蓝毛孢霉，观察到类似的行为。CR值的季节性变化和不同的行为137 Cs从全球沉降物和切尔诺贝利碎片的可能原因进行了讨论。（250字处删节）
For three plants from a peat bog (Trichophorum caespitosum, Molinia coerulea, Calluna vulgaris) the concentration of 137Cs, the ratio 137Cs:134Cs, and stable K was determined in intervals of about 14 d from June to November 1987. The results show that for two grasses, Trichophorum caespitosum and Molinia coerulea (which have only perennial roots but sprout every year while the old leaves wither), the concentration of 137Cs decreased considerably during the growing season (1800-240, respectively, 4000-320 Bq kg-1 dry weight). A remarkably similar behavior was observed for the seasonal variability of K and radiocesium in the two grass species, which resulted in a nearly constant ratio of 137Cs:K during the year. In contrast, for the evergreen plant Calluna vulgaris (heather) which was contaminated surficially by the Chernobyl fallout, the concentrations of K and 137Cs were rather constant during 1987 (leaves about 10,000; stems about 5000 Bq kg-1 dry weight), even though radiocesium was taken up by the leaves and transported within the plant. For the two grasses, the plant:soil concentration ratios (CR) were obtained separately for total 137Cs, 137Cs from the global fallout, and Chernobyl-derived 137Cs. The CR of 137Cs from the global fallout decreased for Trichophorum caespitosum from 1.9 in the spring to 0.08 in the autumn, and for Chernobyl-derived 137Cs from 1.4 to 0.2. For Molinia coerulea, a similar behavior was observed. Possible reasons for the seasonal variability of the CR values and the different behavior of 137Cs from the global fallout and from the Chernobyl debris are discussed.(ABSTRACT TRUNCATED AT 250 WORDS)