Sedimentary phosphorus (P) forms are important representatives of P sources and their bioavailability as well as the potential of sediments to release P in water. In this study, surface sediments along a transect of the Changjiang Estuary and two transects along the Andong salt marsh in the southwest of Hangzhou Bay were subjected to the elucidation of sedimentary P species using the standards, measurements, and testing (SMT) and sequential extraction (SEDEX) methods. The results showed that the mean sedimentary P forms elucidated by the SMT method were as follows: organic P (OP; ∼11–14 mg/kg; ∼30–45% of total P; TP) > apatite P (∼5–15 mg/kg; ∼21–36% TP) > Fe/Al-P (∼8–14 mg/kg; ∼31–34% TP), with inorganic P (IP) composing 54–70% of TP. The mean sedimentary P forms elucidated by the SEDEX method were as follows: authigenic P (∼54–68 mg/kg; ∼41–46% TP) > extractable P (Ex-P; ∼36–53 mg/kg; ∼28–34%) > Fe-P (∼21–27 mg/kg; ∼13–19%) > OP (∼8.7–13 mg/kg; ∼5–8%) > detrital P (De-P; ∼2 mg/kg; ∼1–2% TP), with IP composed of ∼91–94% TP. These results showed that the SEDEX method elucidated higher concentrations of sedimentary P forms as well as the TP from these coastal sediments although the SMT method had the advantage of being more economic and faster. The results of both the SMT and SEDEX methods showed that the Andong salt marsh and Changjiang Estuary sediments had much bioavailable P. The mean percentages of bioavailable P from the SMT and SEDEX methods were ∼64–74% and 52–56% of TP, respectively, indicating that these sediments were prone to release P to the coastal areas.

中文翻译：

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使用SMT和SEDEX两种方法对沉积磷物种进行阐明的比较研究。

沉积物中磷的形态是磷源及其生物利用度以及沉积物在水中释放磷的潜力的重要代表。在这项研究中，利用标准，测量和测试（SMT）以及顺序提取对长江口一个样貌的地表沉积物和杭州湾西南部安东盐沼两个样地的沉积物进行了沉积P种类的阐明。 （SEDEX）方法。结果表明，通过SMT方法阐明的平均沉积P形态如下：有机P（OP；〜11–14 mg / kg；〜P的约30–45％； TP）>磷灰石P（〜5–15 mg / kg；〜21–36％TP）> Fe / Al-P（〜8–14 mg / kg；〜31–34％TP），而无机P（IP）占TP的54–70％。通过SEDEX方法阐明的平均沉积P形态如下：自生P（〜54–68 mg / kg；TP〜41〜46％）>可萃取P（Ex-P;〜36〜53 mg / kg;〜28〜34％）> Fe-P（〜21〜27 mg / kg;〜13-19％）> OP （〜8.7-13 mg / kg；〜5-8％）>碎屑P（De-P；〜2 mg / kg；〜1-2％TP），IP约〜91-94％TP。这些结果表明，尽管SMTEX方法具有更经济，更快的优势，但SEDEX方法阐明了这些沿海沉积物中较高浓度的沉积物P形态和TP。SMT和SEDEX方法的结果表明，安东盐沼和长江口沉积物具有较高的生物利用度P。SMT和SEDEX方法的生物利用度P的平均百分比为TP的〜64–74％和52–56％，分别表明这些沉积物易于向沿海地区释放磷。7-13 mg / kg；约5-8％）>碎屑P（De-P；约2 mg / kg； TP约1-2％），IP约TP约91-94％。这些结果表明，尽管SMTEX方法具有更经济，更快的优势，但SEDEX方法阐明了这些沿海沉积物中较高浓度的沉积物P形态和TP。SMT和SEDEX方法的结果表明，安东盐沼和长江口沉积物具有较高的生物利用度P。SMT和SEDEX方法的生物利用度P的平均百分比为TP的〜64–74％和52–56％，分别表明这些沉积物易于向沿海地区释放磷。7-13 mg / kg；约5-8％）>碎屑P（De-P；约2 mg / kg； TP约1-2％），IP约TP约91-94％。这些结果表明，尽管SMT方法具有更经济，更快的优势，但SEDEX方法阐明了这些沿海沉积物中较高浓度的沉积物P形态和TP。SMT和SEDEX方法的结果表明，安东盐沼和长江口沉积物具有较高的生物利用度P。SMT和SEDEX方法的生物利用度P的平均百分比为TP的〜64–74％和52–56％，分别表明这些沉积物易于向沿海地区释放磷。这些结果表明，尽管SMTEX方法具有更经济，更快的优势，但SEDEX方法阐明了这些沿海沉积物中较高浓度的沉积物P形态和TP。SMT和SEDEX方法的结果表明，安东盐沼和长江口沉积物具有较高的生物利用度P。SMT和SEDEX方法的生物利用度P的平均百分比为TP的〜64–74％和52–56％，分别表明这些沉积物易于向沿海地区释放磷。这些结果表明，尽管SMTEX方法具有更经济，更快的优势，但SEDEX方法阐明了这些沿海沉积物中较高浓度的沉积物P形态和TP。SMT和SEDEX方法的结果表明，安东盐沼和长江口沉积物具有较高的生物利用度P。SMT和SEDEX方法的生物利用度P的平均百分比为TP的〜64–74％和52–56％，分别表明这些沉积物易于向沿海地区释放磷。