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Fine root diameters can change in response to changes in nutrient concentrations

机译：细根直径可以根据养分浓度的变化而变化

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摘要

Plant roots function in the critical role of water and nutrient uptake. Although extensive data exist on functioning of seedling roots, little is known of the actual functionality of the fine roots of mature plants. Although this class of root represents 90% or more of the total root length of a given mature plant, their small size has inhibited detailed studies. Commonly, the critical metrics for studies of root function are root length and total weight, expressed as Specific Root Length. The metric that classifies 'fine roots,' root diameter, is rarely a focus except as average diameter, even though this is the primary characteristic from which accurate estimates of surface area and volume can be calculated. Using data from several preliminary experiments, this study shows consistent changes in measured fine root diameter with changes in concentration of some nutrients. Twelve different species demonstrated concentration dependent diameter increases, or decreases, in response to increasing concentrations of nitrate, phosphorus, aluminum or tannic acid. On the other hand, Cacao (Theobroma cacao L) fine roots changed diameter in response to changes in nitrate concentration, but not ammonium. Clearly pattern of diameter change in response to nutrient concentration is dependent on nutrient, species and their interaction. It is suggested that the routine assessment of fine root diameter will be essential to understanding nutrient uptake dynamics.
机译：植物根在水和养分吸收的关键作用中起作用。尽管存在有关幼苗根部功能的大量数据，但对成熟植物细根的实际功能知之甚少。尽管这类根代表了给定成熟植物总根长的90％或更多，但它们的小​​尺寸阻碍了详细的研究。通常，研究根部功能的关键指标是根长和总重，以比根长表示。将“细根”分类为根直径的度量标准很少会关注，除非作为平均直径，即使这是可以计算出准确的表面积和体积估计值的主要特征。利用来自几个初步实验的数据，这项研究表明，测得的细根直径随某些养分浓度的变化而一致。十二种不同的物质表明，随着硝酸盐，磷，铝或鞣酸浓度的增加，直径随直径变化而增加或减小。另一方面，可可（Theobroma cacao L）细根响应硝酸盐浓度的变化而改变了直径，但不改变铵根。显然，响应养分浓度的直径变化模式取决于养分，种类及其相互作用。建议对细根直径进行常规评估对于了解养分吸收动态至关重要。

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