Li Da-Peng, Wang Jing, Huang Yong
School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215011, China.
Huan Jing Ke Xue. 2013 Jun;34(6):2191-7.
The variation of phosphorus (P) exchange between suspended solids, sediments and overlying water under repeated disturbance was investigated, with the sediments from Meiliang Bay (MLB) and Moon Bay (MB) as materials. The results showed that the concentrations of total P (TP) and particulate P (PP) decreased under repeated disturbance. Dissolved total P (DTP) reached equilibrium at 8 d, and was kept at 0.019 mg x L(-1) (MLB) and 0.039 mg x L(-1) (MB). On the contrary, dissolved inorganic P (DIP) increased in the overlying water, due to the highest concentration of NH4Cl-P in the sediments, and then decreased. It reached equilibrium at 8 d, and was kept at 0.013 mg x L(-1) (MLB) and 0.028 mg x L(-1) (MB). It was coincided with the variation of DO. In addition, the concentrations of DTP and DIP in MLB were higher than those of MB under repeated disturbance. The distribution of P forms (NH4Cl-P, Fe/Al-P, HCl-P) changed due to repeated disturbance. During the repeated disturbance, the concentrations of NH4Cl-P, Fe/Al-P and HCl-P decreased gradually. At the same time, the concentrations of TP, PP, DTP and DIP decreased in the overlying water, but the NH4Cl-P, Fe/Al-P, HCl-P increased in the sediments gradually. The trend in MB was not obvious, but the trend was the same as MLB. The results suggested that suspended solids were the medium in the phosphorus exchange between sediments and overlying water under repeated disturbance.
以梅梁湾（MLB）和月亮湾（MB）的沉积物为材料，研究了反复扰动下悬浮固体、沉积物和上覆水之间磷（P）交换的变化。结果表明，反复扰动下总磷（TP）和颗粒磷（PP）的浓度降低。溶解性总磷（DTP）在8 d时达到平衡，分别保持在0.019 mg·L⁻¹（MLB）和0.039 mg·L⁻¹（MB）。相反，由于沉积物中NH₄Cl-P浓度最高，上覆水中溶解性无机磷（DIP）先增加后降低。它在8 d时达到平衡，分别保持在0.013 mg·L⁻¹（MLB）和0.028 mg·L⁻¹（MB）。这与溶解氧（DO）的变化一致。此外，反复扰动下MLB中DTP和DIP的浓度高于MB。反复扰动导致磷形态（NH₄Cl-P、Fe/Al-P、HCl-P）的分布发生变化。在反复扰动过程中，NH₄Cl-P、Fe/Al-P和HCl-P的浓度逐渐降低。同时，上覆水中TP、PP、DTP和DIP的浓度降低，但沉积物中NH₄Cl-P、Fe/Al-P、HCl-P的浓度逐渐增加。MB中的趋势不明显，但趋势与MLB相同。结果表明，反复扰动下悬浮固体是沉积物和上覆水之间磷交换的介质。
