太湖霍甫水丝蚓(Limnodrilus hoffmeisteri)NH_4^+-N和PO_4^(3-)-P的潜在释放量  

Potential excretion of NH_4^+-N and PO_4^(3-)-P by Limnodrilus hoffmeisteri Claparède in Lake Taihu

作　　者：龚志军[1] 刘劲松[2] 李艳 蔡永久[1] 薛庆举[1] 许浩[1] 

机构地区：[1]中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室,南京210008 [2]江苏省水利厅工程管理处,南京210029 [3]国信招标集团股份有限公司河南分公司,郑州450000

出　　处：《湖泊科学》2017年第2期389-397,共9页Journal of Lake Sciences

基　　金：国家自然科学基金项目(41230744;31270505;41671110);中国科学院南京地理与湖泊研究所"一三五"重点部署项目(NIGLAS2012135002)联合资助

摘　　要：为了研究太湖底栖动物优势种类——霍甫水丝蚓(Limnodrilus hoffmeisteri)对于湖泊富营养化的影响,以温度和密度为模拟控制条件,对太湖霍甫水丝蚓进行营养盐释放的室内控制实验,研究温度和密度的变化对霍甫水丝蚓NH_4^+-N和PO_4^(3-)-P释放率的影响,根据霍甫水丝蚓铵态氮(NH_4^+-N)和磷酸盐(PO_4^(3-)-P)释放率与温度的关系方程,结合太湖霍甫水丝蚓2007-2010年的生物量估算其对太湖水体氮磷的潜在贡献.结果表明,随温度升高太湖霍甫水丝蚓NH_4^+-N和PO_4^(3-)-P的释放率均呈现逐渐升高的趋势,而密度变化对霍甫水丝蚓NH_4^+-N和PO_4^(3-)-P释放率的影响均不显著,太湖霍甫水丝蚓NH_4^+-N和PO_4^(3-)-P年平均释放量分别为1925.5和210.0 t,分别可达到全太湖沉积物-水界面NH_4^+-N和PO_4^(3-)-P的年净通量的19.3%和23.3%,表明霍甫水丝蚓的营养盐释放对于湖泊生物地化循环和湖泊富营养化具有显著的影响.To clarify the effects of Limnodrilus hoffmeisteri, a dominant zoobenthos of Lake Taihu, on lake eutrophication, the con- trolled indoor experiments of Lake Taihu L. hoffmeisteri＇s nutrient excretion were performed by controlling the temperature and den- sity. The effects of temperature and density changes on the excretion rate of Ammonium nitrogen（NH4＋-N） and phosphate（PO4^3--P） of L. hoffmeisteri was analyzed. Based on a correlation relationship between temperature and the excretion rate of NH4＋-N and PO4^3--P of L. hoffmeisteri, and the biomass of L. hoffmeisteri during 2007 - 2010, the potential contributions of nitrogen and phos- phorus released by L. hoffmeisteri to Lake Taihu were estimated. The results showed that with temperature increasing, the excretion rates of NH4＋-N and PO4^3-P of L. hoffmeisteri gradually increased; however, changes in density did not significantly affect the ex- cretion rate of NH4＋-N and PO4^3--P of L. hoffmeisteri. The annual average amount NH4＋-N and PO4^3--P excreted by L. hoffmeisteri were 1925.5 t and 210.0 t, respectively. They were less than the two main exogenous nutrient sources-indirect lakeside and water course nitrogen and phosphorus amounts, which account for approximately 19.3% and 23.3% of the annual net fluxes of NH4＋-N and PO4^3--P in the entire Lake Taihu sediment-water interface. The results of this study showed that nntrient excretion by L. hoffmeisteri had a significant effect on lake biogeochemical cycles and eutrophication.

关 键 词：霍甫水丝蚓 太湖 营养盐释放 铵态氮 磷酸盐 

分 类 号：X524[环境科学与工程—环境工程] X174