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A study of bioavailable phosphorus in the inflowing rivers of Lake Taihu, China

机译:太湖入流河流生物利用磷的研究

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Phosphorus (P) is a vital nutrient for algal growth. Aside from soluble reactive P (SRP), organic P (OP) is used by algae via alkaline phosphatase (AP) hydrolysis, which can play an important role in supplying P. Enzymatically-hydrolysable OP (EHP) can potentially be used as an indicator of bioavailability of P other than SRP in natural waters. We investigated the ecological significance of alkaline phosphatase activity (APA), EHP concentration and P turnover time in the inflowing rivers of Lake Taihu (Taihu) during three hydrologic periods. Results indicated high SRP concentration and low SRP demand by algal suppressed APA in the inflowing rivers, the highest proportion of OP mineralization rate (v) to the maximum reaction velocity of AP (Vmax) is only 14.7%. P turnover time of the inflowing rivers was generally from 3 to 7 days and in exceptional cases, it could exceed 10 days. The high EHP reserve and the sufficient AP for OP mineralization render the rivers a significant source of utilizable OP, further exacerbating eutrophication of Taihu.
机译:磷(P)是藻类生长的重要营养素。除可溶性反应性磷(SRP)外,藻类还通过碱性磷酸酶(AP)水解来使用有机磷(OP),这在供应磷中起着重要作用。可酶水解的有机磷(EHP)可能用作指示剂天然水中除SRP以外的P的生物利用度。我们调查了太湖(太湖)三个水文时期的入河河流中碱性磷酸酶活性(APA),EHP浓度和磷周转时间的生态意义。结果表明,流入河流中被藻类抑制的APA导致SRP浓度高而SRP需求低,OP矿化率(v)与AP最大反应速度(Vmax)的比例最高,仅为14.7%。流入河流的磷周转时间通常为3至7天,在特殊情况下,可能超过10天。高EHP储量和足够的AP来进行OP矿化,使河流成为可利用的OP的重要来源,进一步加剧了太湖的富营养化。

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