Phosphonates and particulate organic phosphorus cycling in an anoxic marine basin
Phosphonates and particulate organic phosphorus cycling in an anoxic marine basin
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DOI：
10.4319/lo.2004.49.5.1593
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发表时间：
2004-09-01
影响因子：
4.5
通讯作者：
Thunell, R
中科院分区：
文献类型：
--
作者：
Benitez-Nelson, CR;O'Neill, L;Thunell, R
总颗粒磷（TPP），颗粒无机磷（PIP），颗粒有机磷（POP）浓度进行了测量，在一个为期一年的系列沉积物捕集器样品收集整个氧化-缺氧水柱（275英寸，455米，930米，1,255米）的Cariaco盆地。TPP、PIP和POP通量随季节变化，并随深度显着下降，范围为65至19 mumol TPP m（-2）d（-1）、43至8 mumol PIP m（-2）d（-1）和22至11 mumol POP m（-2）d（-1）。POP与颗粒有机碳（POC）和颗粒有机氮（PON）之间存在显著的通量相关关系（p < 0.001）。POC和PIP通量和TPP的大部分与PIP池在好氧和缺氧陷阱之间的关系缺乏表明，未来的分析必须分开PIP和POP时，评估生物之间的关系C，N，和P的POC，PON和POP之间的强关系也表明，POP是不是优先emerialized相对于PON和POC在这个缺氧环境中的深度增加。还使用固态P-31核磁共振（NMR）确定P组合物，并且发现膦酸盐、化学和热惰性化合物是TPP池的显著部分。此外，在低通量事件期间，这些化合物相对于更多生物可利用的P酯被优先去除。它们的选择性去除表明，这些化合物可能是缺氧条件下的生物可利用磷的一个未被认识的来源。
Total particulate phosphorus (TPP), particulate inorganic P (PIP), and particulate organic P (POP) concentrations were measured in a year-long series of sediment trap samples collected throughout the oxic-anoxic water column (275 In, 455 m, 930 m, and 1,255 m) of the Cariaco Basin. TPP, PIP, and POP fluxes varied seasonally and decreased significantly with depth, from 65 to 19 mumol TPP m(-2) d(-1), 43 to 8 mumol PIP m(-2) d(-1), and 22 to 11 mumol POP m(-2) d(-1). Significant flux relationships (p < 0.001) were found between POP and particulate organic carbon (POC) and particulate organic nitrogen (PON). The lack of a relationship between POC and PIP fluxes and the large fraction of TPP associated with the PIP pool in both oxic and anoxic traps suggests that future analyses must separate PIP and POP when evaluating biological relationships between C, N, and P The strong relationships between POC, PON, and POP also suggest that POP is not preferentially remineralized relative to PON and POC with increasing depth in this anoxic environment. P composition was also determined using solid state P-31 nuclear magnetic resonance (NMR), and it was found that phosphonates, chemically and thermally inert compounds, are a significant fraction of the TPP pool. Furthermore, these compounds were preferentially removed relative to more bioavailable P esters during a low flux event. Their selective removal suggests that these compounds may be an unrecognized source of bioavailable P under anoxic conditions.