Relative analyses indicated that nutrition status of sediment is very important for the growth of Hydrilla verticillata. 相关分析表明，底质营养状况是影响黑藻生长的重要因素。
Although nutrition at all times of the year has improved since then, the seasonal pattern persists, Doblhammer said. 多布哈默说，尽管人们在一年中各个时期的营养状况与那时相比都已经有所改善，这样的季节性差异却依然存在。
