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  

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

作　　者：吕敬[1] 郑忠明[1] 陆开宏[1] 孙思志[1] 

机构地区：[1]宁波大学生命科学与生物工程学院教育部应用海洋生物技术重点实验室

出　　处：《生态科学》2010年第6期538-542,共5页Ecological Science

基　　金：国家自然科学基金(30771658);浙江省自然科学基金(Y3090640);宁波大学教研项目(JYXMxzh200913)

摘　　要：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.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 NH4＋-N at the depth of 0-0.5cm and 0.5-2 cm surface layer of pore water in treatment 3 and treatment 2 groups were significantly different from those in control group, respectively （p 〈0.05）. There was a significant difference in pore water NO2--N＋NO3--N concentrations at 0-0.5 cm, 0.5-2 cm and 2-4 cm depth layers between treatment groups and control group （p〈0.05）. The concentration of DIP increased first and then decreased with sediment depth, and the concentration reached a maximum value at 2-4 cm depth. The DIP concentration in pore water of surface layer （0-0.5 cm） of treatment groups was significantly different from that of control group （p〈0.05）. The results indicated that bioturbation of B. aeruginosa could increase the content of organic matter on sediment surface and simultaneously reduce sediment stability.

关 键 词：铜锈环棱螺 蓝藻水华 沉积物 有机元素 

分 类 号：X52[环境科学与工程—环境工程]