Abstract:Effects of exogenous nitrogen (N) addition on the N mineralization of Dianchi Lake sediment were investigated using the method of waterlogged incubation. Basic trend of N mineralization in the lake sediments did not change under the conditions of adding aquatic plants residue or inorganic N. At the beginning of experiment the amount of the mineralized N increased rapidly to their peak values, and then decreased gradually. The cumulative maximum amounts of mineralized N were from 722.34 to 625.67mg/kg, which account for 10.5%~20.3% of their total N. The potential N mineralization ability of lake sediment was higher than that of soil. The peak values of the cumulative amount of mineralized N of the sediments adding aquatic plants residue were reached after 21 days, which was increased by 15.9% and 9.3% compared with the original sediment. The time of the peak values of N mineralized from the sediments adding aquatic plants residue and inorganic N was a week later than that of adding aquatic plants residue only, and the cumulative amounts of mineralized N were reduced 7.5%, 9.8% and 8.3%, respectively. The Two-pool model was selected to fit the experimental data using a non-linear regression procedure. The Two-pool model was the one that could appropriately fit the process of organic N mineralization in all studied sediments.
欧阳媛, 王圣瑞, 金相灿, 华祖林. 外加氮源对滇池沉积物氮矿化影响的研究[J]. 中国环境科学, 2009, 29(8): 879-884.
欧Yang-Yuan , WANG Sheng-Rui, JIN Xiang-Can, HUA Zu-Lin. Effect of supplying N on the nitrogen mineralization of Dianchi Lake sediment. . CHINA ENVIRONMENTAL SCIENCECE, 2009, 29(8): 879-884.