腐解黑藻生物量对高硝态氮水体氮素的影响  

Effect of Hydrilla verticillata Decomposition Biomass on Nitrogen Content in Water Containing High Concentration of Nitrate

作　　者：王博[1,2] 叶春[2] 杨劭[1] 冯冠宇[2] 洪涛[2] 赵良元[1] 

机构地区：[1]华中师范大学生命科学学院,湖北省城市水环境生态学重点实验室,湖北武汉430079 [2]中国环境科学研究院湖泊生态环境研究室,北京100012

出　　处：《环境科学研究》2009年第10期1198-1203,共6页Research of Environmental Sciences

基　　金：国家水体污染与治理科技重大专项(2008ZX07101-009)

摘　　要：采用常见沉水植物黑藻为试验材料,引入太湖底泥并设定上覆水初始ρ(硝态氮)为15 mg/L,模拟初春沉水植物大规模腐烂时的温度,开展为期32 d的黑藻腐解试验研究.结果显示,黑藻腐解对水体中ρ(氨氮)与ρ(硝态氮)之和的影响呈U字型,试验条件下黑藻腐解生物量为2.0 g(相当于0.111 kg/m2)时,水体中ρ(氨氮)与ρ(硝态氮)之和最低.随着黑藻的腐解,释放进入水体的有机质和氮素增加,但同时也提高了水体中的ρ(TOC)/ρ(硝态氮)值,降低了Eh,提高了微生物的活性,因此有利于反硝化反应的发生.A decomposition experiment with a common submerged macrophyte, Hydrilla verticillata, was carried out for a period of 32 days, by introducing sediments from Taihu Lake at ρ（NO3 - ） content of 15 mg/L in the overlying water. The temperature of early spring was simulated when submerged plants were decomposed in large-scale. The results showed that the impact of Hydrilla verticiUata decomposition on nitrogen concentration （ρ（NO3^-） and ρ（NH4^＋ ） in water was U-shaped. The nitrogen concentration was lowest under the experimental conditions when biomass decomposition was 2.0 g （equivalent to 0.111 kg/m^2 ） . With the decomposition of Hydrilla verticillata, the release of organic matter and nitrogen into the water increased; however, at the same time, theρ （TOC）/ρ （NO3^ - ） ratio increased, Eh lowered, and microbial activity increased, which were conducive to the occurrence of denitrification.

关 键 词：衰亡沉水植物 黑藻 生物量 有机碳源 反硝化作用 

分 类 号：X524[环境科学与工程—环境工程]