Does seed mass drive the differences in relative growth rate between growth forms?
Does seed mass drive the differences in relative growth rate between growth forms?
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DOI：
10.1098/rspb.2013.0921
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发表时间：
2013-07-07
影响因子：
4.7
通讯作者：
Rees, Mark
中科院分区：
文献类型：
--
作者：
Houghton, Jennie;Thompson, Ken;Rees, Mark
草本植物相对于木本植物具有更高的相对生长速率（RGRs），这一观点是植物生态学中许多最有影响力的理论的基础。这种生长速率的差异被认为反映了生理学、分配和叶结构的系统变化。然而，以前记录这种效应的研究忽略了种子质量的差异。由于木本物种通常具有较大的种子，并且RGR与种子质量呈负相关，因此在木本物种中观察到的较低RGR完全可能是具有较大种子的结果，而不是不同的生长策略。通过综合已发表的文献，我们探索了RGR和生长形式之间的关系，考虑了种子质量和研究特异性效应（例如：G.研究持续时间和盆体积），使用混合效应模型。该模型表明，草本物种确实比木本物种具有更高的RGR，并且这种差异与种子质量无关，因此在所有种子质量中，草本物种平均生长速度比木本物种快。
The idea that herbaceous plants have higher relative growth rates (RGRs) compared with woody plants is fundamental to many of the most influential theories in plant ecology. This difference in growth rate is thought to reflect systematic variation in physiology, allocation and leaf construction. Previous studies documenting this effect have, however, ignored differences in seed mass. As woody species often have larger seeds and RGR is negatively correlated with seed mass, it is entirely possible the lower RGRs observed in woody species is a consequence of having larger seeds rather than different growth strategies. Using a synthesis of the published literature, we explored the relationship between RGR and growth form, accounting for the effects of seed mass and study-specific effects (e. g. duration of study and pot volume), using a mixed-effects model. The model showed that herbaceous species do indeed have higher RGRs than woody species, and that the difference was independent of seed mass, thus at all seed masses, herbaceous species on average grow faster than woody ones.