Predicting inter-taxa differences in plant uptake of cesium-134/137.
Predicting inter-taxa differences in plant uptake of cesium-134/137.
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预测植物吸收铯 134/137 的类群间差异。
DOI：
10.2134/jeq2004.0454
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发表时间：
2005
影响因子：
2.4
通讯作者：
N. R. Watt
中科院分区：
文献类型：
--
作者：
N. Willey;Shi;N. R. Watt
对于（134/137）Cs和许多其他土壤污染物，转移到植物的研究集中在特定的作物和植物修复候选人，所有植物类群的一小部分产生的吸收数据。尽管植物类群之间的吸收差异的意义，土壤到植物的转移模型，以预测它们的能力，目前仅限于这些类群的数据存在，没有方法来预测其他类群的吸收。我们使用残差最大似然（REML）分析的数据从实验（包括89个植物类群从中国加上32植物修复候选人）连同数据从文献中，构建一个数据库的相对（134/137）Cs浓度在273植物类群。REML（134/137）Cs在植物体内的浓度分布不呈正态分布，但具有明显的聚集性。方差分析（ANOVA），编码与最近的有序显花植物的发生，表明植物类群不独立的行为（134/137）Cs浓度，因为42%和15%的类群间差异与以上的物种和有序水平的发生，分别。一般来说，双子叶植物，特别是双子叶植物，紫菀目，紫菀目，具有高的（134/137）Cs浓度，而豆科植物和木兰科植物，特别是禾本科植物，具有低的（134/137）Cs浓度。一般而言，耐胁迫杂草（S-R）生长策略的植物具有高浓度的Cs，而竞争（C）和通才（C-S-R）策略的植物具有低浓度的Cs，尽管这些效应不如单根性策略的显著。因此，植物的生殖和生长策略可能被用来预测植物吸收（134/137）Cs的类群间差异的显着部分。
For (134/137)Cs, and many other soil contaminants, research into transfer to plants has focused on particular crops and phytoremediation candidates, producing uptake data for a small proportion of all plant taxa. Despite the significance of differences in uptake between plant taxa, the capacity of soil-to-plant transfer models to predict them is currently confined to those taxa for which data exist, there being no method to predict uptake by other taxa. We used residual maximum likelihood (REML) analysis on data from experiments (including 89 plant taxa from China plus 32 phytoremediation candidates) together with data from the literature, to construct a database of relative (134/137)Cs concentrations in 273 plant taxa. The REML (134/137)Cs concentrations in plants are not normally distributed but significantly clustered. Analysis of variance (ANOVA), coded with a recent ordinal phylogeny for flowering plants, showed that plant taxa do not behave independently for (134/137)Cs concentration because 42 and 15% of inter-taxa differences are associated with phylogeny above the species and ordinal level, respectively. In general, Eudicots, and especially the Caryophyllales, Asterales, and Brassicales, have high (134/137)Cs concentrations, while the Fabales and Magnoliids, in particular Poales, have low (134/137)Cs concentrations. Plants of the stress-tolerant ruderal (S-R) growth strategy sensu Grime have, in general, high concentrations of Cs, while those of the competitive (C) and generalist (C-S-R) strategies have low concentrations, although these effects are less pronounced than those of phylogeny. Plant phylogeny and growth strategy might thus be used to predict a significant portion of inter-taxa differences in plant uptake of (134/137)Cs.