中文摘要：

水母暴发频率在中国海域逐渐增加,暴发后的消亡对海洋生态环境有重大影响.本试验通过对沙海蜇消亡进行模拟,研究了水母消亡过程中碳、氮、磷的释放特征.结果表明：水母消亡是一个快速的生源要素释放过程,水母消亡时碳、氮、磷的释放速率与浓度均在消亡初期达到最大.水母消亡释放的溶解态物质远高于颗粒态.其中,溶解态有机碳与颗粒态有机碳的最大净释放速率分别为（103.77±12.60）与（1.52±0.37）mg·kg^-1·h^-1.整个消亡过程中溶解态氮主要为NH4^＋-N,约占总溶解氮的69.6%-91.6%;消亡初期,溶解态磷主要以溶解有机磷为主约占总溶解磷的63.9%-86.7%,消亡后期则主要为PO4^3--P,约占50.4%-60.2%.相反颗粒态氮则主要以颗粒有机氮为主,占总颗粒氮的（88.6±6.9）%,颗粒态磷则以颗粒无机磷为主,占总颗粒磷的（73.9±10.5）%.总体上,水母消亡释放的生源要素量为碳〉氮〉磷.同时,水母消亡使水体中C/N降低,N/P升高,表明水母消亡可导致水体相对的高碳、高氮负荷.

英文摘要：

Jellyfish bloom has been increasing in Chinese seas and decomposition after jellyfish bloom has great influences on marine ecological environment.We conducted the incubation of Nemopilema nomurai decomposing to evaluate its effect on carbon,nitrogen and phosphorus recycling of water column by simulated experiments.The results showed that the processes of jellyfish decomposing represented a fast release of biogenic elements,and the release of carbon,nitrogen and phosphorus reached the maximum at the beginning of jellyfish decomposing.The release of biogenic elements from jellyfish decomposition was dominated by dissolved matter,which had a much higher level than particulate matter.The highest net release rates of dissolved organic carbon and particulate organic carbon reached（103.77±12.60） and（1.52±0.37） mg·kg^-1·h^-1,respectively.The dissolved nitrogen was dominated by NH4^＋-N during the whole incubation time,accounting for69.6%-91.6%of total dissolved nitrogen,whereas the dissolved phosphorus was dominated by dissolved organic phosphorus during the initial stage of decomposition,being 63.9%-86.7%of total dissolved phosphorus and dominated by PO4^3--P during the late stage of decomposition,being 50.4%-60.2%.On the contrary,the particulate nitrogen was mainly in particulate organic nitrogen,accounting for（88.6±6.9）%of total particulate nitrogen,whereas the particulate phosphorus was mainly in particulate inorganic phosphorus,accounting for（73.9±10.5）%of total particulate phosphorus.In addition,jellyfish decomposition decreased the C/N and increased the N/P of water column.These indicated that jellyfish decomposition could result in relative high carbon and nitrogen loads.