MOE Key Laboratory of Environment Remediation and Ecosystem Health, College of Environmental and Resource Science, Zhejiang University, Hangzhou, China.
J Hazard Mater. 2011 Jul 15;191(1-3):212-8. doi: 10.1016/j.jhazmat.2011.04.067. Epub 2011 Apr 22.
Aquatic plant debris in lakes or rivers may affect phosphorus flux in water-sediment systems. In this study, either aquatic plant debris or typical plant components (cellulose or glucose), were added into a system of sediment (50 g) and overlying water (2L) with different initial SRP (soluble reactive phosphorus) concentrations to investigate the impact. After 18 days of treatment with 4 g of plant debris, the SRP in the overlying water for 0.5 and 2 mg L(-1) initial SRP tests at 30°C decreased by 41 and 53%, respectively, compared to the treatments without plant debris. Cellulose and glucose treatments gave similar results as plant debris treatment. When the water-sediment system was sterilized, the cellulose- or glucose-facilitated decrease in SRP vanished. Additionally, in the non-sterilized system, the glucose treatment significantly increased both the microbial biomass carbon and the microbial biomass phosphorous in the sediment. Although total phosphorous in the sediment increased with glucose treatment, its water soluble and iron associated inorganic fractions, two labile phosphorus fractions, were clearly reduced. Our results suggest that the short-term retention of plant debris in water systems facilitates a decrease in overlying water SRP through microbe-mediated mechanisms of phosphorus adsorption and stabilization in sediment.
湖泊或河流中的水生植物碎屑可能会影响水-沉积物系统中的磷通量。在这项研究中，将水生植物碎屑或典型的植物成分（纤维素或葡萄糖）添加到具有不同初始 SRP（可溶性反应磷）浓度的沉积物（50 g）和上覆水（2 L）系统中，以研究其影响。在 30°C 下用 4 g 植物碎屑处理 18 天后，对于初始 SRP 为 0.5 和 2 mg L(-1) 的测试，与没有植物碎屑的处理相比，上覆水中的 SRP 分别降低了 41%和 53%。纤维素和葡萄糖处理与植物碎屑处理产生相似的结果。当水-沉积物系统被消毒时，纤维素或葡萄糖促进的 SRP 减少消失了。此外，在未消毒的系统中，葡萄糖处理显著增加了沉积物中的微生物生物量碳和微生物生物量磷。尽管沉积物中的总磷随葡萄糖处理而增加，但两种易变磷分数，即其水溶性和铁结合的无机分数，明显减少。我们的结果表明，植物碎屑在水系统中的短期滞留通过微生物介导的磷吸附和稳定机制促进了上覆水 SRP 的减少。
