底泥间歇扰动对静止水体磷迁移的累加效应
ACCUMULATION EFFECT OF INTERMITTENT SEDIMENT DISTURBANCE ON PHOSPHORUS MIGRATION IN STATIC WATER
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摘要: 模拟了静止水体的底泥间歇扰动过程,研究了底泥间歇扰动对上覆水中磷迁移的累加效应.结果表明,随着底泥扰动次数的增加,溶解性活性磷(SRP)、溶解态磷(DTP)、生物可利用颗粒态磷(BAPP)、生物有效磷(BAP)等形态磷含量显著降低.与第1次扰动相比,第5次扰动后,SRP、DTP、BAPP、BAP分别降低了84.26%、71.60%、59.21%、62.26%.底泥扰动通过物理、化学吸附使SRP在DTP中所占的比重从83.31%降至49.38%,同时抑制了BAPP向DTP的转化,从而降低了水体富营养化的风险.Abstract: Intermittent sediment disturbance in static water was simulated continuously to investigate the accumulation effect of intermittent disturbance on phosphorus(P) migration in overlying water. The results show that the concentrations of soluble reactive P(SRP), dissolved total P(DTP), bio-available particulate P(BAPP) and bio-available P(BAP) decreased markedly with increasing disturbance time. After the fifth disturbance, SRP, DTP, BAPP, BAP decreased by 84.26%, 71.60%, 59.21%, 62.26% respectively, compared to the first disturbance. The average proportion of SRP in DTP declined from 83.31%(the first disturbance) to 49.38% (the fifth disturbance) by physi-sorption and chemi-sorption due to sediment disturbance. Moreover, intermittent sediment disturbance might restrain the transformation of P from BAPP to DTP, and hopefully reduce the risk of eutrophication.
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