铜锈环棱螺生物扰动对"蓝藻水华"水体底泥及其间隙水中碳、氮、磷含量的影响

实验室内建立小型模拟生态系统,根据铜锈环棱螺(Bellamya aeruginosa)的密度设置了3个处理组和1个对照组.结果显示:铜锈环棱螺对底泥0～0.5 cm及0.5～2 cm有机质影响较明显,显著降低了底泥中的C:P.处理组3和处理组2间隙水NH4+-N含量分别在底泥0～0.5cm及0.5～2 cm深度和对照组之间存在显著差异(p＜0.05).间隙水中NO2--N+NO3--N的变化较复杂,处理组NO2--N+NO3--N含量在0～0.5 cm,0.5～2cm及2～4cm与对照组相比差异显著(p＜0.05).间隙水中DIP含量随底泥深度先增后减,在2～4 cm处含量达最大,DIP含量在0.5～2 cm深度处理组与对照组之间有显著差异(p＜0.05).铜锈环棱螺生物干扰增加了底泥表层有机质的含量,同时降低了其稳定性.

Effects of bioturbation by freshwater snail,Bellamya aeruginosa,on the contents of C,N and P in sediment and pore water in blue-green algal bloom waters.

Microcosms were established in the laboratory.The experiment comprised of three treatment groups and one control group, which were set up by using different density of Bellamya aeruginosa.The results showed that bioturbation of B.aeruginosa had obvious effects on the concentration of organic matter at the depth of 0-0.5 cm and 0.5-2 cm from the surface layer of sediments.And the rate of C:N was decreased significantly(p<0.05).The concentrations of NH_4~+-N at the depth of 0-0.5cm and 0.5-2 cm surface layer ...