Effects of phytoplankton on the distribution of submerged macrophytes in a small canal
Effects of phytoplankton on the distribution of submerged macrophytes in a small canal
复制标题
浮游植物对小运河沉水植物分布的影响
DOI：
10.1007/s11355-013-0227-6
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发表时间：
2013
影响因子：
2
通讯作者：
Masahiko Isobe
中科院分区：
文献类型：
--
作者：
Ryuichiro Shinohara;Takashi Asaeda;Masahiko Isobe
自20世纪60年代以来，日本关东平原的沉水植物一直在消失。这种消失通常归因于大型植物和浮游植物之间的相互作用。浮游植物有助于遮蔽可用的光，并将无机碳的可用性从游离CO2变为HCO3−，用于光合作用。然而，有限的信息是通过浮游植物丰度碳馏分和沉水植物之间的相互作用。在这篇短文中，我们观察了一条小型运河中沉水植物和浮游植物的分布。我们发现，尽管高光合有效辐射（PAR）在下游地区，低游离CO2浓度通过浮游植物丰度可以耗尽游离CO2沉水植物。相反，上游区域在高游离CO2浓度的环境中表现出水生植物。沉水植物的稳定碳同位素比值遵循这种模式，在下游区域出现更多的正值，在上游区域出现更多的负值。据报道，浮游植物限制了沉水植物的光供应，但碳供应也可能是沉水植物分布的一个因素。由于沉水植物的水源是地下水，因此地下水的保存可能对沉水植物的恢复起着关键作用。
Submerged macrophytes have been disappearing from the Kanto Plain, Japan since the 1960s. This disappearance is usually attributable to the interaction between macrophytes and phytoplankton. Phytoplankton contributes to shading of the available light and changes the availability of inorganic carbon from free CO2to HCO3−for use in photosynthesis. However, limited information is available about the interaction between carbon fraction and submerged macrophytes through phytoplankton abundance. In this short note, we observe the distribution of submerged macrophytes and phytoplankton in a small canal. We found that, despite high photosynthetically active radiation (PAR) in the downstream region, low free CO2concentration through phytoplankton abundance can deplete free CO2for submerged macrophytes. In contrast, the upstream region exhibited macrophytes in an environment with high free CO2concentration. The stable carbon isotope ratio of submerged macrophytes follows this pattern, with more positive values occurring in the downstream region and more negative values in the upstream region. It has been reported that phytoplankton limits light availability for submerged macrophytes, but carbon availability could also be a factor in the distribution of submerged macrophytes. Because the source of water for submerged macrophytes is groundwater, its preservation possibly plays a key role for the restoration of submerged macrophytes.