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

The Nitrogen Environmental Organism-Geochemistry Quantitative Relation and Hydraulic Environment Effe ct in Plain Hydrographic Net

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。

It is chiefly discussed that the nitrogen environment organism-geochemistry quantitative relation and hydraulic environment effect of three types plain hydrographic net rivers possessing variously high, medium, and low suspended substance content in this paper. In spring, autumn, and winter, the total nitrogen and organic nitrogen re-suspension rate of main channel possessing high suspended substance content are more than anti-nitrification rate and ammoniation rate. The soure effect of total nitrogen and organic nitrogen are resulted. The ammoniation rate〉nitrification rate〉anti-nitrification rate, the soure effect of ammonia nitrogen and nitre nitrogen are resulted,during winter to next annual spring. The rivers exist remove effect of various forms nitrogen during other seasons. The environment organism-geochemistry actions enable that the rivers nitrogen content circulate cyclically, and the nitrogen contents complete a cycle from spring to next annual spring. The various forms nitrogen contents of the the rivers exist upper and lower limit. The lower limit of the various nitrogens ensure that hydro-ecosystem possesses full store of organic nitrogen, and sufficient supply biological available nitrogen source.