Invariant scaling relations across tree-dominated communities
Invariant scaling relations across tree-dominated communities
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DOI：
10.1038/35070500
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发表时间：
2001-04-05
期刊：
影响因子：
64.8
通讯作者：
Niklas, KJ
中科院分区：
文献类型：
--
作者：
Enquist, BJ;Niklas, KJ
需要组织原则来将跨空间和时间尺度的生物体、群落和生态系统属性联系起来。在这里，我们扩展异速生长理论的生物体的属性如何改变其大小的变化，并测试其预测对世界范围内的数据集的森林群落，通过量化树木的大小频率分布，站立的生物量，物种数量和单位面积的个人数量之间的关系。除高纬度地区外，个体数与茎基径的-2次方或地上生物量的-3/4次方成正比。也正如预测的那样，这种比例关系变化不大，物种多样性，总立木生物量，纬度和地理采样面积。在模拟模型中，个体将生物量分配给叶、茎和生殖，并竞争空间和光照，获得了与群落相同的特征。与异速生长理论，我们的研究结果表明，许多宏观生态功能的社区可能会出现一些异速生长的原则在个人的水平上运作。
Organizing principles are needed to link organismal, community and ecosystem attributes across spatial and temporal scales. Here we extend allometric theory-how attributes of organisms change with variation in their size-and test its predictions against worldwide data sets for forest communities by quantifying the relationships among tree size-frequency distributions, standing biomass, species number and number of individuals per unit area. As predicted, except for the highest latitudes, the number of individuals scales as the -2 power of basal stem diameter or as the -3/4 power of above-ground biomass. Also as predicted, this scaling relationship varies little with species diversity, total standing biomass, latitude and geographic sampling area. A simulation model in which individuals allocate biomass to leaf, stem and reproduction, and compete for space and light obtains features identical to those of a community. In tandem with allometric theory, our results indicate that many macroecological features of communities may emerge from a few allometric principles operating at the level of the individual.