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首页> 外文期刊>Aquatic Microbial Ecology >Gross and net primary production: closing the gap between concepts and measurements.
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Gross and net primary production: closing the gap between concepts and measurements.

机译：初级生产总值和净值：缩小概念和度量之间的差距。

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摘要

We are living at a time when accurate knowledge of the magnitude of the drawdown of inorganic carbon by autotrophic metabolism is especially crucial to our understanding of global carbon cycling and the functioning of the global ecosystem. Since algae contribute approximately half of the planet's annual primary productivity, understanding the processes contributing to the net assimilation of CO2 is critical. In this paper, we briefly discuss the range of approaches to measurements of aquatic photosynthesis that have been used, including more recent developments such as fluorescence and stable isotope studies, and whether these provide data that reflect net or gross productivity. We then consider the range of processes that run counter to photosynthetic carbon assimilation, with emphasis on respiration (and its measurement) and excretion of dissolved organic carbon, and how these affect our estimates of net primary production. We conclude by briefly assessing how future changes in global climate might impact not just overall primary productivity, but also the balance between net and gross carbon assimilation.
机译：我们生活在这样一个时代，对自养代谢的无机碳下降量的准确了解对于我们对全球碳循环和全球生态系统功能的理解至关重要。由于藻类约占地球每年初级生产力的一半，因此了解导致CO 2 净吸收的过程至关重要。在本文中，我们简要讨论了已使用的水生光合作用测量方法的范围，包括荧光和稳定同位素研究等最新进展，以及这些方法是否提供反映净生产率或总生产率的数据。然后，我们考虑与光合碳同化背道而驰的过程范围，重点是呼吸（及其测量）和溶解性有机碳的排泄，以及这些过程如何影响我们对净初级生产的估算。最后，我们简要评估一下全球气候的未来变化将如何不仅影响整体初级生产力，而且还会影响净碳同化和总碳同化之间的平衡。

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