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.
出处
《环境科学研究》
EI
CAS
CSCD
北大核心
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)
关键词
衰亡沉水植物
黑藻
生物量
有机碳源
反硝化作用
submerged macrophyte decay
Hydrilla verticillata
biomass
organic carbon source
denitrification
