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摘要 : 美国亚利桑那大学等处的研究人员建立了一个代谢比例理论,揭示植物生产力对气候的反应。相关文章发表于2014年7月20日的《Nature》杂志上。


在这项研究中,Sean Michaletz等人建立了一个代谢比例理论,来测试直接和间接气候效应的相对重要性。通过将他们的模型应用到关于植物生产力的一个全球数据集,本文作者得出结论认为,间接效应能够解释气候对生产力的影响。



Convergence of terrestrial plant production across global climate gradients

Sean T. Michaletz, Dongliang Cheng, Andrew J. Kerkhoff & Brian J. Enquist

Variation in terrestrial net primary production (NPP) with climate is thought to originate from a direct influence of temperature and precipitation on plant metabolism. However, variation in NPP may also result from an indirect influence of climate by means of plant age, stand biomass, growing season length and local adaptation. To identify the relative importance of direct and indirect climate effects, we extend metabolic scaling theory to link hypothesized climate influences with NPP, and assess hypothesized relationships using a global compilation of ecosystem woody plant biomass and production data. Notably, age and biomass explained most of the variation in production wheras temperature and precipitation explained almost none, suggesting that climate indirectly (not directly) influences production. Furthermore, our theory shows that variation in NPP is characterized by a common scaling relationship, suggesting that global change models can incorporate the mechanisms governing this relationship to improve predictions of future ecosystem function.

对应Nature杂志: 2014年8月7日Nature杂志精选

来源: Nature 浏览次数:119


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