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首页> 外文期刊>Journal of Experimental Botany >A new physical interpretation of plant root capacitance.
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A new physical interpretation of plant root capacitance.

机译：植物根电容的新物理解释。

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摘要

Capacitance has been used as a non-destructive measure of root system size for 30 years. The equipment required is cheap and simple to apply in both field and laboratory. Good linear correlations have been reported between capacitance and root mass. A model by F. N. Dalton, predicting a linear relationship between these two variables, has become accepted widely. This model was tested for barley (Hordeum vulgare) grown hydroponically using treatments that included: raising roots out of solution, cutting roots at positions below the solution surface, and varying the distance between plant electrode and the solution surface. Although good linear correlations were found between capacitance and mass for whole root systems, when roots were raised out of solution capacitances were not linearly related to submerged root mass. Excision of roots in the solution had negligible effect on the measured capacitance. These latter observations conflict with Dalton's model. Capacitance correlated linearly with the sum of root cross-sectional areas at the solution surface and inversely with distance between plant electrode and solution surface. A new model for capacitance is proposed that is consistent with these observations.
机译：电容已被用作根系系统大小的无损测量技术已有30年了。所需设备便宜且易于在现场和实验室中使用。据报道，电容与根质量之间具有良好的线性相关性。 F. N. Dalton的模型预测了这两个变量之间的线性关系，已被广泛接受。测试了该模型的无水大麦（Hordeum vulgare），其使用的处理方法包括：从溶液中拔出根，在溶液表面以下的位置切割根，以及改变植物电极与溶液表面之间的距离。尽管在整个根系中电容和质量之间都发现了良好的线性相关性，但是当根从溶液中升起时，电容与淹没根质量并没有线性关系。溶液中根的切除对所测电容的影响可忽略不计。后面的这些观察结果与道尔顿的模型相矛盾。电容与溶液表面根部横截面积的总和成线性关系，与植物电极与溶液表面之间的距离成反比。提出了一种新的电容模型，该模型与这些观察结果一致。

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