丹麦哥本哈根大学S. C. Maberly、K. Sand-Jensen和O. Pedersen研究组合作，提出淡水植物群落是由流域特性和光合特性组成。该项研究成果发表在2019年11月15日出版的《科学》上。

他们调查了碳酸氢盐和二氧化碳的浓度与具有碳酸氢盐利用特性的淡水植物的密度之间是否存在联系。在全球范围内，具有该性状的植物物种的密度随碳酸氢盐浓度的增加而增加。但是，从区域范围来看，在二氧化碳浓度大大高于空气平衡的地方，碳酸氢盐的利用频率降低，这与适应碳限制的特性一致。未来碳酸氢盐和二氧化碳浓度的人为变化可能会改变淡水植物群落的物种组成。

据悉，与陆地植物不同，许多水生植物的光合作用除二氧化碳（CO₂）外还依赖碳酸氢盐，以补偿水中的低扩散性和潜在的CO₂消耗。碳酸氢盐和二氧化碳的浓度随流域地质变化很大。

附：英文原文

Title: Catchment properties and the photosynthetic trait composition of freshwater plant communities

Author: L. L. Iversen, A. Winkel, L. Baastrup-Spohr, A. B. Hinke, J. Alahuhta, A. Baattrup-Pedersen, S. Birk, P. Brodersen, P. A. Chambers, F. Ecke, T. Feldmann, D. Gebler, J. Heino, T. S. Jespersen, S. J. Moe, T. Riis, L. Sass, O. Vestergaard, S. C. Maberly, K. Sand-Jensen, O. Pedersen

Issue&Volume: 2019/11/15

Abstract: Unlike in land plants, photosynthesis in many aquatic plants relies on bicarbonate in addition to carbon dioxide (CO2) to compensate for the low diffusivity and potential depletion of CO2 in water. Concentrations of bicarbonate and CO2 vary greatly with catchment geology. In this study, we investigate whether there is a link between these concentrations and the frequency of freshwater plants possessing the bicarbonate use trait. We show, globally, that the frequency of plant species with this trait increases with bicarbonate concentration. Regionally, however, the frequency of bicarbonate use is reduced at sites where the CO2 concentration is substantially above the air equilibrium, consistent with this trait being an adaptation to carbon limitation. Future anthropogenic changes of bicarbonate and CO2 concentrations may alter the species compositions of freshwater plant communities.

DOI: 10.1126/science.aay5945

Source:https://science.sciencemag.org/content/366/6467/878