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主要讨论了高、中、低悬浮物含量的3类平原河网河流氮素的环境生物-地球化学行为定量关系及水环境效应。春、秋、冬季,作为主航道的高悬浮物含量河流的总氮、有机氮再悬浮速率>反硝化速率和氨化速率,产生水体总氮、有机氮的来源增量效应。冬季至下年度初春,3类河流氮素的氨化速率>硝化速率>反硝化速率,产生水体氨氮、硝氮的来源增量效应。其他季节,各形态氮素均存在去除效应。环境生物-地球化学行为使水体氮素含量呈周期性循环,并在春季至下年度春季完成1个循环周期。水体各形态氮素含量均存在上下限极值,氮素下限极值的存在保证了水生生态系统有充足的有机氮储备和生物可利用氮源的充分供给。
The quantitative relationship of environmental bio-geochemical behaviors of three kinds of plain river networks with high, medium and low suspended matter contents and their water environmental effects were discussed. Spring, autumn and winter, total suspended nitrogen content, resuspension rate of organic nitrogen> denitrification rate and ammonification rate of the main suspended sediments in the main waterway lead to the increment of source of total nitrogen and organic nitrogen in water. From winter to early spring next year, the ammonification rate, nitrification rate and denitrification rate of three kinds of rivers produced the source increment effect of ammonia nitrogen and nitrate nitrogen in water body. In other seasons, there are removal effects for all forms of nitrogen. Environmental bio-geochemical behavior of the nitrogen cycle of water was cyclical, and in the spring to the spring next year to complete a cycle. The existence of upper and lower limits of nitrogen content in all forms of water body has the upper and lower limits, the lowest limit of nitrogen to ensure that aquatic ecosystems have adequate reserves of organic nitrogen and a sufficient supply of bio-available nitrogen sources.