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Implications of Sediment Properties on Phosphorus Availability to the Selenastrum capricornutum in Urmia Lake Rivers
Clean - Soil Air Water ( IF 1.5 ) Pub Date : 2022-05-31 , DOI: 10.1002/clen.202200164 Hamed Arfania 1 , Abbas Samadi 2 , Farrokh Asadzadeh 2 , Ebrahim Sepehr 2 , Sjoerd van der Zee 3
Clean - Soil Air Water ( IF 1.5 ) Pub Date : 2022-05-31 , DOI: 10.1002/clen.202200164 Hamed Arfania 1 , Abbas Samadi 2 , Farrokh Asadzadeh 2 , Ebrahim Sepehr 2 , Sjoerd van der Zee 3
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Increasing anthropogenic loading of phosphorus (P) threatens aquatic ecosystems. The bioavailability of P in sediments for algal growth depends on several physiochemical properties. This study is aimed at selecting the best chemical extraction method to characterize P-availability for the alga Selenastrum capricornutum. Principal component analysis of the data identified two components that cover 79.3% of the total variation, and these components are dominated by particle size distribution, active calcium carbonate equivalence, and electical conductivity (EC). Many of the considered extractions are positively correlated with each other, with the exception being Bray-II. The sediments of some rivers have an Olsen-extractable P higher than 20 mg kg−1, that is considered a threshold value above which the aquatic environment may become negatively affected. The average rank order of P extraction by single extractants is: Colwell > Mehlich III > 0.1 m NaOH > Olsen > Morgan > Soltanpour and Schwab (AB-DTPA) > Bray II. The Colwell-extractable P concentrations of sediments varies from 1.44 to 88.0 mg kg−1. The Cowell extractant significantly correlates with algal growth (r2 = 0.92, P < 0.001) and gives a rough estimate of the amount of bioavailable P in sediments.
中文翻译：
沉积物性质对 Urmia 湖河流中月见草磷有效性的影响
磷（P）的人为负荷增加威胁着水生生态系统。沉积物中磷对藻类生长的生物利用度取决于几个物理化学性质。本研究旨在选择最佳的化学提取方法来表征藻类Selenastrum capricornutum的磷利用率。数据的主成分分析确定了覆盖总变异的 79.3% 的两个成分，这些成分主要由粒度分布、活性碳酸钙当量和电导率 (EC) 决定。许多考虑的提取彼此正相关，Bray-II 除外。一些河流的沉积物具有高于 20 mg kg -1的 Olsen 可萃取 P，这被认为是水生环境可能受到负面影响的阈值。单一萃取剂萃取 P 的平均排序为：Colwell > Mehlich III > 0.1 m NaOH > Olsen > Morgan > Soltanpour and Schwab (AB-DTPA) > Bray II。Colwell 可提取的沉积物 P 浓度从 1.44 到 88.0 mg kg -1不等。Cowell 萃取剂与藻类生长显着相关（r 2 = 0.92，P < 0.001），并粗略估计了沉积物中可生物利用的 P 的量。
更新日期：2022-05-31
中文翻译：
沉积物性质对 Urmia 湖河流中月见草磷有效性的影响
磷（P）的人为负荷增加威胁着水生生态系统。沉积物中磷对藻类生长的生物利用度取决于几个物理化学性质。本研究旨在选择最佳的化学提取方法来表征藻类Selenastrum capricornutum的磷利用率。数据的主成分分析确定了覆盖总变异的 79.3% 的两个成分，这些成分主要由粒度分布、活性碳酸钙当量和电导率 (EC) 决定。许多考虑的提取彼此正相关，Bray-II 除外。一些河流的沉积物具有高于 20 mg kg -1的 Olsen 可萃取 P，这被认为是水生环境可能受到负面影响的阈值。单一萃取剂萃取 P 的平均排序为：Colwell > Mehlich III > 0.1 m NaOH > Olsen > Morgan > Soltanpour and Schwab (AB-DTPA) > Bray II。Colwell 可提取的沉积物 P 浓度从 1.44 到 88.0 mg kg -1不等。Cowell 萃取剂与藻类生长显着相关（r 2 = 0.92，P < 0.001），并粗略估计了沉积物中可生物利用的 P 的量。
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