Migration of carbon, nitrogen and phosphorus during organic matter mineralization in eutrophic lake sediments

作者：Yan, Xingcheng; Wang, Mingyue; Xu, Xiaoguang; Wang, Guoxiang^*; Sun, Hao; Yang, Yunhao; Shi, Ao

来源：Hupo Kexue/Journal of Lake Sciences, 2018, 30(2): 306-313.

DOI：10.18307/2018.0203

• Initial concentration
• Lake eutrophications
• Lake taihu
• Migration
• Mineralization
• Nitrogen and phosphorus
• Organic matter mineralization
• Sedimentary organic matter

The migration characteristics of carbon, nitrogen and phosphorus during organic matter mineralization were studied through laboratory incubation experiments, to simulate Lake Taihu, a large eutrophic lake in China. Results showed that sedimentary organic matter was mineralized and released dissolve inorganic carbon. At the end of incubation, the cumulative contents of CH4 and CO2 was 1492.21 mg/g(dw) and 498.96 mg/g(dw), respectively, with CH4 occupied 89.16% of gaseous carbon (in C mass). In addition, a large amount of nutrients, such as nitrogen and phosphorus, were released into overlying water. The highest concentrations of total nitogen, total phosphorus and ammonium nitrogen were 62.16, 28.16 and 139.45 times of the initial concentration, respectively. While nitrate nitrogen concentration declined throughout the incubation time, and its final concentration was 0.21 times of the initial concentration. Under anaerobic conditions, organic matter mineralization not only produced a large amount of CH4, CO2 but also promoted the release of ammonium nitrogen and phosphorus from sediments. These soluble inorganic nutrients further aggravate the lake eutrophication and promote the primary production, with subsequent increasing input of organic matter into lake sediment. This may be one of the important reasons for self-maintenance of lake eutrophication.

• 出版日期2018-3-6
• 单位南京师范大学