We investigated the nutrient acquisition of the seagrass Cymodocea nodosa and the importance of sediment to water column nutrient pulses, which regularly occur in coastal lagoons forced by incoming flood tides. Ammonium was preferentially taken up and accounted for 60-90% of the total daily N acquisition, whereas amino acid acquisition through belowground plant parts represented the second most important source of N, accounting 8-34%. The uptake of ammonium pulses increased dramatically the daily N acquisition from 9.5 mmol m-2 day-1 to 1.33 mmol m-2 day-1 at ambient nutrient concentrations, enabling the species to meet its N demand. Roots accounted for 96% of the total phosphate acquisition, with no evidence for P limitation. The ability of seagrasses to adapt to nutrient pulses may be an overlooked nutrition strategy common to many ecosystems where nutrient availability in the water column is low but nutrient pulses occur.

中文翻译：

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海草结节藻的营养：铵盐而不是磷酸盐的脉冲对于维持物种的生长至关重要。

我们调查了海草Cymodocea nodosa的养分获取情况以及沉积物对水柱养分脉动的重要性，这些现象经常在来潮被强迫的沿海泻湖中发生。铵态氮被优先吸收，占每日总氮吸收量的60-90％，而通过地下植物部分获得的氨基酸则是第二重要的氮源，占8-34％。在环境营养物浓度下，铵脉冲的吸收将每日氮的吸收量从9.5 mmol m-2 day-1急剧增加到1.33 mmol m-2 day-1，使该物种能够满足其氮需求。根占磷吸收总量的96％，没有磷限制的证据。