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Universal scaling of respiratory metabolism, size and nitrogen in plants

机译：植物呼吸代谢，大小和氮的普遍缩放

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The scaling of respiratory metabolism to body size in animals is considered to be a fundamental law of nature(1-11), and there is substantial evidence for an approximate 3/4-power relation. Studies suggest that plant respiratory metabolism also scales as the 3/4-power of mass(12-14), and that higher plant and animal scaling follow similar rules owing to the predominance of fractal-like transport networks and associated allometric scaling(8-14). Here, however, using data obtained from about 500 laboratory and field-grown plants from 43 species and four experiments, we show that whole-plant respiration rate scales approximately isometrically ( scaling exponent approximate to 1) with total plant mass in individual experiments and has no common relation across all data. Moreover, consistent with theories about biochemically based physiological scaling(15-18), isometric scaling of whole-plant respiration rate to total nitrogen content is observed within and across all data sets, with a single relation common to all data. This isometric scaling is unaffected by growth conditions including variation in light, nitrogen availability, temperature and atmospheric CO2 concentration, and is similar within or among species or functional groups. These findings suggest that plants and animals follow different metabolic scaling relations, driven by distinct mechanisms.
机译：动物中呼吸代谢的缩放比例被认为是自然界的基本定律（1-11），并且有充分的证据表明存在大约3/4幂关系。研究表明，植物呼吸代谢也按质量的3/4幂成比例（12-14），并且由于分形样运输网络和相关的异速结垢占主导地位，较高的动植物缩放遵循类似的规则（8- 14）。但是，在这里，使用从43种物种的约500种实验室植物和田间种植植物获得的数据以及四个实验，我们发现，整个植物的呼吸速率在各个实验中的比例与植物总质量大致等距（比例指数约为1），并且具有所有数据之间没有共同关系。此外，与基于生化的生理尺度理论（15-18）相一致，在所有数据集中和所有数据集中都观察到了整个植物呼吸速率对总氮含量的等距缩放，所有数据都具有一个单一关系。该等距缩放不受生长条件（包括光，氮的利用率，温度和大气中CO2浓度的变化）的影响，并且在物种或官能团之内或之中相似。这些发现表明，动植物遵循不同的代谢比例关系，受不同机制的驱动。

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