The freshwater plant species Lemna minor suffers significantly in nutrient uptake and biomass accumulation performance when grown in saline effluents, such as those produced in brackish aquaculture operations. To determine the exact impact of salinity to these plant traits, this study measured the nutrient uptakes and biochemical composition of L. minor grown in synthetic aquaculture medium of increasing salinity levels. The overall trend for biomass growth showed that higher salinity levels resulted in lower growth with a mass gain of about 13% in 12.5 ppt medium compared with 96% in the control. However, the NO₃^– uptake appeared to be unaffected by differences in salinity. NH₄⁺ uptake was significantly affected only at salinity concentrations of 10 ppt and 12.5 ppt. The relationship between PO₄^3– uptake and salinity was less clear, as PO₄^3– levels appeared to decrease linearly for all test groups and were shown to be statistically insignificant. At the end of the experiment period, the control medium showed the lowest measured COD levels, 17 mg/L while the 12.5 ppt solution has the highest COD level, 61 mg/L. Protein content showed a decline with increasing salinity of growth medium, while carbohydrate content was shown to be increasing. These preliminary data identify the general relationship between salinity and the measured criteria of L. minor and will subsequently serve as the basis for further remediation studies and the development of salinity mitigation methods.

中文翻译：

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微咸水中Lemna minor的营养吸收和生化组成

当在盐水中（如半咸水养殖操作中产生的废水）中生长时，淡水植物小Lemna minor的养分吸收和生物量积累性能将受到严重影响。为了确定盐度对这些植物性状的确切影响，本研究测量了盐度水平不断提高的合成水产养殖培养基中生长的小L.的营养吸收和生化成分。生物量生长的总体趋势表明，较高的盐度水平导致较低的生长，在12.5 ppt培养基中的质量增加约为13％，而对照中为96％。然而，NO ₃ ^-摄取似乎是在盐度差的影响。NH ₄ ⁺仅在盐浓度为10 ppt和12.5 ppt时，摄入量才受到显着影响。PO的关系₄ ^{3 -}摄取和盐度不太清楚，如PO ₄ ^{3 -}水平似乎对所有测试组线性减小，并显示出有统计学显着。在实验结束时，对照培养基的最低化学需氧量为17 mg / L，而12.5 ppt溶液的最高化学需氧量为61 mg / L。蛋白质含量显示出随着生长培养基盐度增加而下降，而碳水化合物含量显示出增加。这些初步数据确定了盐度与小L.的测量标准之间的一般关系。 并将作为进一步补救研究和开发盐度缓解方法的基础。