人为扰动背景下城市边缘溪流底质硝化-反硝化潜力分析

发布时间：2018-01-08 01:01

本文关键词：人为扰动背景下城市边缘溪流底质硝化-反硝化潜力分析　出处：《环境科学》2017年11期 　论文类型：期刊论文

【摘要】：2016年5月至2017年1月,在合肥城区东北部边缘某一溪流的自然状态段(情形1)、点源排污段(情形2)和水土流失段(情形3)设置6个采样点位,逐月采集水样和表层底质样,解析不同情形下溪流底质硝化-反硝化潜力及其变化特征,并进行差异性和影响因素分析.结果表明:(1)溪流底质硝化活性均值为0.381%,并以情形2底质硝化活性最高,情形1的夏季硝化活性相对最强、冬季最弱,情形2、3硝化活性高低排序为:春季夏季秋季冬季;(2)溪流底质硝化速率均值为0.364mg·(kg·d)~(-1),其中以情形2底质硝化速率最高,情形2、3的各采样点春季硝化速率显著最高,其它季节相差不大,情形1的各季节变化不很明显;(3)溪流底质反硝化活性为37.25%,反硝化速率为57.68 mg·(kg·d)~(-1),其中情形2底质反硝化活性和反硝化速率都高于相同季节的其他情形,情形1、2的反硝化活性和反硝化速率高低排序均为:夏季春季秋季冬季,情形3的反硝化活性和反硝化速率排序均为:春季夏季秋季冬季;(4)差异性分析表明,情形1、2在硝化速率方面存在极显著差异性,情形1、3在反硝化活性、反硝化速率方面存在极显著差异性,而情形2、3在硝化速率、反硝化活性和反硝化速率方面均呈现极显著差异性;(5)偏最小二乘回归分析表明,3种情形在硝化活性和硝化速率方面重要贡献因素差异较大.
[Abstract]:From May 2016 to January 2017, the natural state of a stream on the northeastern edge of Hefei City (case 1). Six sampling sites were set up in point source sewage section (case 2) and soil erosion section (case 3). Water samples and surface sediment samples were collected month by month. The nitrification-denitrification potential of stream sediment and its variation characteristics were analyzed under different conditions. The results showed that the mean nitrification activity of the sediment was 0.381, and the nitrification activity of the sediment was the highest in case 2, the highest in case 1. The nitrification activity in summer was the highest in case 1. The order of nitrification activity in winter is spring, summer, autumn and winter. (2) the mean nitrification rate of sediment was 0.364 mg 路kg / d ~ (-1), in which the nitrification rate was the highest in case 2 and the highest in spring in case 2 ~ (3). Other seasons have little difference, and the change of each season in case 1 is not very obvious. (3) the denitrification activity of sediment was 37.25 and the denitrification rate was 57.68 mg 路kg 路d ~ (-1). In case 2, denitrification activity and denitrification rate were higher than those in the same season. The order of denitrification activity and denitrification rate in case 1 was summer, spring, autumn and winter. In case 3, the order of denitrification activity and denitrification rate was: spring, summer, autumn and winter; (4) the difference analysis showed that there were significant differences in nitrification rate, denitrification activity and denitrification rate in case 1 ~ (2), and in case 2, there was a significant difference in denitrification activity and denitrification rate in case 1 ~ (2). 3There were significant differences in nitrification rate, denitrification activity and denitrification rate. 5) partial least square regression analysis showed that there were significant differences in the important contribution factors of nitrification activity and nitrification rate among the three cases.
【作者单位】：合肥工业大学资源与环境工程学院;安徽新华学院土木与环境工程学院;
【基金】：国家自然科学基金项目(51579061,51179042)
【分类号】：X52
【正文快照】： 硝化-反硝化作用是沉积物中氮的地球生物化学循环的一个重要过程,也是水体氮滞留的重要作用机制.近30年来,有关水体沉积物硝化-反硝化潜力、作用机制及影响因素的研究,一直都是环境科学、环境地球化学、水生态学等学科领域的热点[1~4].总的来看,尽管针对溪流等小河流水体沉积

【相似文献】