The dissolved nitrogen (DIN) concentrations in the Wujiang River basin were much higher than the global average values and the main form of nitrogen was nitrate nitrogen (NO3-N).
乌江流域溶解无机氮含量较世界平均水平高，其主要存在形式为硝态氮（NO_3-N）。
Reducing the nutrient quantity released by sediment through manipulating the period for digging up sediment is necessary to enhance removal ability of HBFM for dissolved nitrogen and phosphorus.
因此合理控制底泥清除周期减少底泥释放量，是提高HBFM溶解性氮、磷去除能力的重要途径之一。
Reducing the nutrient quantity released by sediment through manipulating the period for digging up sediment is necessary to enhance removal ability of HBFM for dissolved nitrogen and phosphorus.
因此合理控制底泥清除周期减少底泥释放量，是提高HBFM溶解性氮、磷去除能力的重要途径之一。
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