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Submerged macrophyte-bed effects on water-column phosphorus, chlorophyll a, and bacterial production

机译：沉水植物床对水柱磷，叶绿素a和细菌产生的影响

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Submerged macrophytes are a major component of freshwater ecosystems, yet their net effect on water column phosphorus (P), algae, and bacterioplankton is not well understood. A 4-month mass-balance study during the summer quantified the net effect of a large (similar to5.5 ha) undisturbed macrophyte bed on these water-column properties. The bed is located in a slow-flowing (0.05-0.1 cm s(-1)) channel between two lakes, allowing for the quantification of inputs and outputs. The P budget for the study period showed that, despite considerable short-term variation, the macrophyte bed was a negligible net sink for P (0.06 mg m(-2) day(-1), range from -0.76 to +0.79 mg m(-2) day(-1)), demonstrating that loading and uptake processes in the weedbed roughly balance over the summer. Chlorophyll a was disproportionately retained relative to particulate organic carbon (POC), indicating that the algal component of the POC was preferentially trapped. However, the principal contribution of the weedbed to the open water was a consistent positive influence on bacterioplankton production over the summer. Conservative extrapolations based on measured August specific exports (m(-2) day(-1)) of P and bacterial production exiting the weedbed applied to five regional lakes varying in lake morphometry and macrophyte cover suggest that even in the most macrophyte dominated of lakes (66% cover), P loading from submerged weedbeds never exceeds 1% day(-1) of standing epilimnetic P levels, whereas subsidization of bacterioplankton production can reach upward of 20% day(-1). The presence of submerged macrophytes therefore differentially modifies algae and bacteria in the water column, while modestly altering P dynamics over the summer.
机译：沉水植物是淡水生态系统的主要组成部分，但对水柱中磷（P），藻类和浮游细菌的净效应尚不清楚。在夏季进行的为期4个月的质量平衡研究量化了大型（约5.5公顷）未受干扰的大型植物床对这些水柱特性的净影响。该床位于两个湖泊之间的缓慢流动（0.05-0.1 cm s（-1））通道中，从而可以量化输入和输出。研究期的P预算显示，尽管短期变化很大，但大型植物床的P（0.06 mg m（-2）day（-1），从-0.76到+0.79 mg m （-2）天（-1）），证明了整个夏季杂草中的负载和吸收过程基本平衡。相对于颗粒有机碳（POC），叶绿素a被不成比例地保留，表明POC的藻类成分被优先捕获。但是，杂草对开阔水域的主要贡献是对夏季浮游细菌生产的持续积极影响。保守的推断基于对8个特定的P出口量（m（-2）天（-1））和从杂草中排出的细菌产量进行了分析，该结果适用于五个形态各异，生植物覆盖率不同的区域性湖泊，这表明即使在以生植物为主的大多数湖泊中（66％的覆盖率），淹没的杂草中的磷负载量不超过站立式表皮磷水平的1％day（-1），而对浮游植物产生的补贴可以达到20％day（-1）以上。因此，淹没的大型植物的存在差异修饰水柱中的藻类和细菌，同时在夏季适度改变磷的动态。

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