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引用本文:李柯,关保华,刘正文.蓝藻碎屑分解速率及氮磷释放形态的实验分析.湖泊科学,2011,23(6):919-925. DOI:10.18307/2011.0614
LI Ke,GUAN Baohua,LIU Zhengwen.Experiments on decomposition rate and release forms of nitrogen and phosphorus from the decomposing cyanobacterial detritus. J. Lake Sci.2011,23(6):919-925. DOI:10.18307/2011.0614
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蓝藻碎屑分解速率及氮磷释放形态的实验分析
李柯1, 关保华2, 刘正文2
1.华中农业大学水产学院, 武汉 430070;2.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
摘要:
在试验条件下研究了水华蓝藻堆积使叶绿素浓度达到1600μg/L时, 水体所含蓝藻形成的碎屑在水中的分解速率及其营养盐释放情况.结果表明:蓝藻碎屑的总氮含量为88.56±4.10mg/g, 其在水体中有较高的分解速率, 2d内即分解掉41.9%的生物量;蓝藻碎屑磷释放速率要高于氮, 但其导致的水体中溶解性总氮浓度的升高则较溶解性总磷持续时间更长;实验前4d, 溶解性无机氮(DIN)和有机氮(DON)浓度均有所升高, 之后DIN趋于稳定, 而DON则持续升高;DIN中以铵态氮为主, 硝态氮、亚硝态氮含量较低;DON中尿素氮比例仅为3%, 说明其不是蓝藻分解释放的主要有机氮形式;溶解性无机磷(DIP)、溶解性有机磷(DOP)浓度在前4d均有所升高, 之后DOP逐渐转化为DIP并趋于稳定.本实验结果将有助于深入了解蓝藻水华对湖泊氮、磷循环的影响。
关键词:  蓝藻碎屑  分解  营养盐释放  氮形态  磷形态
DOI:10.18307/2011.0614
分类号:
基金项目:国家科技支撑计划项目(2007BAC26B02);国家"973"计划项目(2008CB418104);国家水体污染控制与治理科技重大专项项目(2009ZX07210-001-004);国家自然科学基金项目(31070419)联合资助
Experiments on decomposition rate and release forms of nitrogen and phosphorus from the decomposing cyanobacterial detritus
LI Ke1, GUAN Baohua2, LIU Zhengwen2
1.College of Fisheries, Huazhong Agricultural University, Wuhan 430070, P.R.China;2.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P.R.China
Abstract:
The decomposition rate of cyanobacterial detritus and the release forms of nitrogen and phosphorus from the decomposing cyanobacterial detritus were investigated experimentally in this paper.Results showed that the content of total nitrogen of cyanobac-terial detritus was 88.56±4.10 mg/g;the decomposition rate of cyanobacterial detritus was high and there was 41.9% dry mass lost in two days.The release rate of total phosphorus of cyanobacterial detritus was faster than total nitrogen, but the increase in concentration of total dissolved nitrogen (TDN) in the water column lasted longer than total dissolved phosphorus (TDP) during the decomposing of cyanobacteria.After the increase in the first four days, the concentration of dissolved inorganic nitrogen (DIN) was kept constant but the concentration of dissolved organic nitrogen (DON) continued to increase.The ammonia was the main form of DIN in the water column, while the concentration of nitrate and nitrite was low during the decomposition.The Urea-N was not the main form of DON released by cyanobacterial detritus because the average percentage of Urea-N was low (3% of DON).The concentration of dissolved inorganic phosphorus (DIP) and dissolved organic phosphorus (DOP) increased in the first four days, and then DOP was transformed into DIP progressively.The present study demonstrated that the decomposition rate of cya-nobacterial detritus is high, with releasing of organic and inorganic nitrogen and phosphorus.The result of present study shed light on understanding of the impact of cyanobacterial blooms on nitrogen and phosphorus cycling of lakes.
Key words:  Cyanobacterial detritus  decomposition  nutrient release  forms of nitrogen  forms of phosphorus
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