摘要
为研究东平湖不同生物量菹草腐烂对上覆水硫化物和SO2-4浓度的影响,将杀青后的菹草按0.1、1、5、10 g/L的生物量梯度分别投放进装有超纯水的烧杯中,并置于25℃的恒温培养箱中。在不同时刻测定了上覆水的p H值、溶解氧、硫化物和SO2-4的浓度,并采用气-液双膜传质模型估算了上覆水H2S的扩散速率。结果表明:菹草分解过程中,生物量越大,DO浓度的降低越显著且恢复越缓慢,但p H值的变化恰好相反;硫化物浓度、SO2-4浓度和H2S扩散速率均随菹草生物量的增加而显著增加,但至试验结束均各自趋于一致;硫化物浓度和H2S扩散速率均呈上升—下降的变化趋势,较高生物量培养下SO2-4浓度在第1天达到峰值后逐渐降低;试验期间H2S的扩散总量与菹草生物量存在显著的指数增长关系。
In order to study the impact of decomposition of different biomass of Potamogeton crispus on the sulfur concentrations in overlying water, Potamogeton crispus collected from Dongping Lake in early May of 2011 was killed and dried to a constant weight,and then put in beakers with ul-trapure water according to the biomass gradient of 0. 1,1,5 and 10 g/L. The beakers were placed in an incubator and kept at 25℃ for 39 days. The pH values and concentrations of DO,sulfide and SO4^2- in the overlying water were determined at the different time of the experiment,and dif-fusion rates of H2 S were estimated by using the classical two-film mass transfer model. The results show that in the decomposition process of Pota-mogeton crispus,concentrations of DO in overlying water descends more rapidly and then ascends more slowly as the biomass increased,while the change of pH values is just the opposite. SO4^2- concentrations and H2 S diffusion rates increase more significantly with the biomass increasing,but they closely reach to a same level at the end of the experiment respectively. Sulfide concentrations and H2 S diffusion rates firstly increase and then decrease. SO4^2- concentrations in the relatively high biomass reach to the maximums in the first day,and then declines. Exponential correlation is found between the total amounts of H2 S emission and the biomass of potamogeton crispus.
出处
《人民黄河》
CAS
北大核心
2014年第11期65-68,共4页
Yellow River
基金
国家自然科学基金资助项目(41072258
41301544)
山东省自然科学基金资助项目(ZR2010DL007
ZR2010DL008)
黄土与第四纪地质国家重点试验室开放基金资助项目(SKLLQG1219)
山东省水土保持与环境保育重点实验室开放基金资助项目(STKF2012001)
关键词
SO4^2
浓度
硫化物
腐烂
菹草
东平湖
SO4^2- concentration
sulfide
decomposition
Potamogeton crispus
Dongping Lake
