Shi Xiao-Dan, Li Da-Peng, Wang Ren, Huang Yong
Huan Jing Ke Xue. 2015 Mar;36(3):955-62.
To explain the synergistic effect of physical and Chironomus plumosus combined disturbance on the regeneration and transformation of internal phosphorus, laboratory static incubation experiments were carried out with the sediments and overlying water from a eutrophic river in Suzhou. Rhizon samplers were used to acquire the pore water. In the experiment, we compared the variation of different phosphorus forms in the overlying water, the pore water and sediments under the Chironomus plumosus disturbance and the combined disturbance. The results indicated that the amount of different forms of phosphorus (TP, PP, DTP, DIP) in the overlying water under combined disturbance was higher than that under Chironomus plumosus combination disturbance. It was attributed to the significant increase of the microbial activity in the sediments. Compared with Chironomus plumosus disturbance, the amount of DIP and ferrous decreased with the greater magnitude and range. It was attributed to the superposition effect of the physical and benthos disturbance on the penetration depth of the dissolved oxygen. In addition, the amount of NH4C1-P decreased remarkably in the 0-2 cm sediment while Fe/Al-P increased obviously. Furthermore, the variation magnitude of NH4Cl-P and Fe/Al-P was higher under combined disturbance than that under Chironomus plumosus disturbance, which suggested the superposition effect of the physical and benthos disturbance on the regeneration and migration of phosphorus.
为解释物理扰动与羽摇蚊联合扰动对沉积物内源磷释放及形态转化的协同作用，以苏州某富营养化河流的底泥及上覆水为研究对象，开展室内静态模拟实验。采用Rhizon土壤溶液采样器采集孔隙水，对比研究了羽摇蚊扰动及物理与羽摇蚊联合扰动下上覆水、孔隙水及底泥中不同形态磷含量的变化。结果表明，联合扰动下上覆水中总磷（TP）、颗粒态磷（PP）、溶解性总磷（DTP）、溶解性无机磷（DIP）含量均高于羽摇蚊单独扰动，这主要是由于联合扰动显著提高了底泥中微生物活性。与羽摇蚊单独扰动相比，联合扰动下DIP和亚铁含量下降幅度更大、范围更广，这主要是由于物理扰动与底栖动物扰动对溶解氧穿透深度的叠加作用。此外，联合扰动下0-2 cm底泥中NH4C1-P含量显著下降，Fe/Al-P含量显著上升，且联合扰动下NH4Cl-P和Fe/Al-P含量变化幅度大于羽摇蚊单独扰动，表明物理与底栖动物扰动对磷的释放与迁移具有叠加作用。
