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首页> 外文期刊>Limnologica >Phosphate uptake in a macrophyte-rich Pampean stream
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Phosphate uptake in a macrophyte-rich Pampean stream

机译：富含大型植物的Pampean流中的磷酸盐吸收

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摘要

We estimated phosphate uptake in an eutrophic and macrophyte-rich Pampean stream, in a basin where dominant land use was agricultural activity. Our hypothesis was that phosphate retention may be linked to macrophyte abundance, especially that of submerged plants. Four short-term constant-rate phosphate addition experiments were carried out in late spring, summer, autumn and winter under different discharge, background phosphate concentration and macrophyte abundance. Changes in added soluble reactive phosphorus (SRP) concentration were monitored along the studied reach and corrected for dilution to estimate phosphate uptake length (S_w) and other spiraling metrics (V_f or mass transfer coefficient, and U or nutrient uptake rate). All spiraling metrics indicated a higher SRP retention in spring than in autumn, despite macrophyte cover was similar in both sampling dates (39% and 51%, respectively). Phosphate retention was not detected neither in summer (when macrophyte biomass and especially that of submerged plants was the highest one) nor in winter. Ambient SRP concentrations in the stream were an order of magnitude higher than concentrations observed in pristine streams; nevertheless, under the varying conditions of discharge and phosphate levels observed in our study, we found no retention in summer and winter, a phosphate uptake comparable with those measured in impaired streams in autumn, and with those measured in pristine streams in late spring.
机译：我们估算了富营养化和富含大型植物的潘邦河流中的磷酸盐吸收，该流域的主要土地利用是农业活动。我们的假设是磷酸盐的保留可能与大型植物的丰度有关，尤其是淹没植物的丰度。在春季，夏季，秋季和冬季的不同排放量，背景磷酸盐浓度和大型植物丰度下，进行了四个短期恒速磷酸盐添加实验。沿研究范围监测添加的可溶性反应性磷（SRP）浓度的变化，并对其稀释度进行校正，以估算磷酸盐的吸收长度（S_w）和其他螺旋度量（V_f或传质系数以及U或养分吸收率）。尽管两个采样日期的植物覆盖都相似（尽管分别为39％和51％），但所有螺旋度量指标均表明春季的SRP保留率高于秋季。在夏季（大型植物的生物量，尤其是淹没植物的生物量最高）时或冬季均未检测到磷酸盐的保留。溪流中的环境SRP浓度比原始溪流中的浓度高一个数量级。但是，在我们研究中观察到的不同排放和磷酸盐水平条件下，我们发现夏季和冬季没有滞留，与秋季受损河流中测得的磷酸盐吸收量和春季末期原始河流中测得的磷酸盐吸收量相当。

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