研究报告
梁金凤,王晨,张可刚,白军红,魏卓群,张玲,王亚琪,刘海朱,刘哲.枯落物输入对白洋淀浅水湖泊氮转化的影响[J].环境科学学报,2022,42(1):259-268
枯落物输入对白洋淀浅水湖泊氮转化的影响
- Effects of litter input on nitrogen transformation in Baiyangdian shallow lake
- 基金项目:国家自然科学基金委国际合作与交流项目(No.51961125201);中国博士后科学基金项目(No.2021M690020)
- 梁金凤
- 北京师范大学环境学院,水环境模拟国家重点实验室,北京 100875
- 王晨
- 北京师范大学环境学院,水环境模拟国家重点实验室,北京 100875
- 张可刚
- 华北电力大学环境科学与工程学院,保定 071066
- 白军红
- 北京师范大学环境学院,水环境模拟国家重点实验室,北京 100875
- 魏卓群
- 北京师范大学环境学院,水环境模拟国家重点实验室,北京 100875
- 张玲
- 北京师范大学环境学院,水环境模拟国家重点实验室,北京 100875
- 王亚琪
- 北京师范大学环境学院,水环境模拟国家重点实验室,北京 100875
- 刘海朱
- 北京师范大学环境学院,水环境模拟国家重点实验室,北京 100875
- 刘哲
- 北京师范大学环境学院,水环境模拟国家重点实验室,北京 100875
- 摘要:以白洋淀浅水湖泊沉积物和上覆水为研究对象,通过45 d室内厌氧培养实验,探究了不同氮水平条件下枯落物添加(芦苇、篦齿眼子菜、芦苇+篦齿眼子菜)对沉积物-水体系中无机氮转化的影响.结果表明,枯落物添加显著增加了沉积物和水中的铵态氮含量、无机氮含量及净氮矿化速率(p<0.05),而显著降低了水中硝态氮含量(p<0.05),但不同枯落物添加处理间无显著差异(p>0.05).枯落物添加显著增加了水中可溶性有机碳含量(p<0.05),其中以芦苇枯落物添加的效果最为显著;枯落物添加对沉积物碳含量无显著影响(p>0.05).高氮水平条件下水和沉积物的净矿化速率和净硝化速率显著低于其它氮水平(p<0.05),而沉积物净硝化速率则在低氮水平条件下呈最高值.研究表明,枯落物输入在短期内显著影响了沉积物-水体系中氮转化过程,但这种影响在不同氮水平间不存在显著差异.
- Abstract:Sediment and overlying water samples were collected from Baiyangdian Lake which is one of typical shallow lakes. A 45-day anaerobic incubation experiment was carried out to explore the effects of litter addition (i.e., Phragmites australis, Potamogeton pectinatus, and mixture of P. australis and P. pectinatus) on inorganic nitrogen transformation in the system of sediment-water under different nitrogen level treatments. The results showed that litter addition significantly increased ammonium nitrogen contents, inorganic nitrogen contents and net nitrogen mineralization rates in sediments and waters (p<0.05), but significantly decreased nitrate nitrogen content in waters (p<0.05), and no significant differences were observed among different litter addition treatments (p>0.05). Litter addition significantly increased the content of dissolved organic carbon in waters (p<0.05), and the addition of P. australis litter had a strong effect compared to other litter addition treatments (p<0.05); litter addition had no significant effect on the content of organic carbon in sediments (p>0.05). The net mineralization rates and nitrification rates in waters and sediments were significantly lower at high nitrogen level than at other nitrogen levels (p<0.05), while the net nitrification rate in sediments was the highest at low nitrogen level. Our results showed that litter input had a significant effect on nitrogen transformation in sediment-water system in a short time, but the effects had no significant differences among different nitrogen levels.