摘要
采用密闭培养实验装置于室温(25℃左右)及pH为75条件下,对西湖底泥中有机质完全降解及转化为CO2和CH4的速率进行了模拟研究.结果表明,在西湖湖水现有供氧水平(50—86mg(O2)/L)条件下,底泥中有机质完全降解的速率最为缓慢,培养期间(42天)平均只有072mg(C)/(kg·d).当湖水供氧水平进一步上升(86→120→160mg(O2)/L),CO2释放速率增加,最大值可达到87mg(C)/(kg·周);当湖水供氧水平下降(86→0mg(O2)/L),CH4释放速率加快,最大值可达到46mg(C)/(kg·周).
Rates of complete degradation of organic matter in sediment from the West Lake and its changes into CO 2 and CH 4 were simulatively studied with the closed culture experimental installation. Under the current oxygen supply level(8.6 mg(O 2)/L) of the West Lake water, the rate of complete degradation of organic matter in the sediment was slowest. The average degradation rate was only 0.72 mg(C)·kg -1 ·d -1 during the whole culture time. The release rate of CO 2 increased with the increase(8.6→12 0→16.0 mg (O 2)/L) in oxygen supply levels of the West Lake water. The maximum release rate of CO 2 was up to 8.7 mg (C)·kg -1 ·week -1 under the experimental conditions. The release rate of CH 4 also speeded up when dissolved oxygen in water decreased. The maximum release rate of CH 4 was up to 4.6 mg (C)·kg -1 ·week -1 under the airtight culture condition.
出处
《环境科学学报》
CAS
CSCD
北大核心
1999年第1期11-15,共5页
Acta Scientiae Circumstantiae
基金
浙江省自然科学基金
中国科学院南京土壤所土壤圈物质循环开放研究实验室资助