九龙江河流-河口系统反硝化、厌氧氨氧化以及氧化亚氮的排放
Denitrification, ANAMMOX and nitrous oxide emissions from river-estuary ecosystem of the Jiulong River
Abstract
我国东南地区农业具有高输入和高输出的现代农业特征,氮肥的施用导致河流-河口系统氮(N)素负荷显著上升,影响流域内N素在水生生态系统内的迁移、转化,并对水生生态系统健康构成威胁。本研究结合同位素示踪法、现场静态箱培养和实验室模拟等方法对九龙江干流、支流、水电站库区和河口四类代表性水生生态系统的营养盐浓度、反硝化速率、厌氧氨氧化(AAO)速率、氮气(N2)与氧化亚氮(N2O)的产生速率等进行测定和分析。重点对河流-河口系统N去除过程中水体活性N素转化为N2和N2O的机制和数量进行探讨,以揭示农业河流-河口系统反硝化与AAO过程在水生生态系统中N去除中的作用,定量分析两者在系统N永久性去除中的速率和... The modern agriculture in southeast of China is characterized by high input and high output. The excessive nitrogen (N) from agricultural catchments might accumulate in river-estuaries ecosystems, and stimulate the processes of N transport and transformation, furthermore, pose a threat on health of aquatic ecosystems. By using the nitrogen isotope pairing method, floating chamber method, in-lab an...