Li Da-peng, Huang Yong, Fan Cheng-xin
State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China.
Huan Jing Ke Xue. 2010 Aug;31(8):1795-800.
The course of intermittent sediment disturbance-sedimentation, that sediment disturbance was for 10 min and succeeding sedimentation was for 1430 min each day over a 17-day period, was simulated to investigate the variation of bioavailable phosphorus (BAP) in overlying water. The results showed that the concentrations of BAP increased obviously at Oh after each disturbance, and the maximum concentration of BAP was reached up to 2.82 mg x L(-1) after 1 d (the first disturbance). However, the BAP gradually decreased with the sedimentation time increase (1 h, 6 h, 24 h). Moreover, at 0, 1, 6, 24 h after disturbance, the BAP gradually declined with the number of sediment disturbance increase, but the BAP at Oh after each disturbance was higher than that at 1 h, 6 h, 24 h. This may be attributed to the immediate release of bioavailable particulate phosphorus ( BAPP), as a result of sediment disturbance. The average BAPP/BAP was up to 95.0% at Oh after disturbance over a 17-day period, but this value gradually decreased with the sedimentation time increase (1 h, 6 h, 24 h). At 0 h, 1 h, 6 h, 24 h after each disturbance, the equilibrium concentrations of total dissolved phosphorus (TDP) were reached after 5 d (0.053, 0.062, 0.051, 0.045 mg x L(-1)), and the percentage of TDP in BAP also decreased gradually. Therefore, it is considered that sediment intermittent disturbance can accelerate the transformation from TDP to PP and hinder the development process of eutrophication in standing water. Sequential fractionation also indicates that the percentage of refractory phosphorus in Tot-P increased from 72.8% (raw sediments) to 77.3% (sediments after disturbance), attributable to the increase of concentrations of occluded Fe/Al-P. It is hopefully suggested an acceleration of transformation of phosphorus from mobile fractions to refractory fractions.
模拟了为期17天的间歇性沉积物扰动-沉降过程，即每天沉积物扰动10分钟，随后沉降1430分钟，以研究上覆水中生物可利用磷（BAP）的变化。结果表明，每次扰动后0小时BAP浓度明显增加，1天后（第一次扰动）BAP最高浓度达到2.82mg·L-1。然而，随着沉降时间增加（1小时、6小时、24小时），BAP逐渐降低。此外，在扰动后0、1、6、24小时，BAP随着沉积物扰动次数增加而逐渐下降，但每次扰动后0小时的BAP高于1小时、6小时、24小时的BAP。这可能归因于沉积物扰动导致生物可利用颗粒态磷（BAPP）的立即释放。在17天的扰动后0小时，平均BAPP/BAP高达95.0%，但该值随着沉降时间增加（1小时、6小时、24小时）而逐渐降低。每次扰动后0小时、1小时、6小时、24小时，总溶解磷（TDP）的平衡浓度在5天后达到（0.053、0.062、0.051、0.045mg·L-1），TDP在BAP中的百分比也逐渐降低。因此，认为沉积物间歇性扰动可加速TDP向PP的转化，阻碍静水富营养化的发展过程。连续分级分析还表明，难溶性磷在总磷中的百分比从72.8%（原始沉积物）增加到77.3%（扰动后沉积物），这归因于铁/铝结合态磷浓度的增加。有望表明磷从可移动组分向难溶性组分的转化加速。
