本期目录
李如忠,戴源,刘晓薇,王莉.巢湖十五里河沉积物硝化速率的城乡梯度变化及相关性[J].环境科学学报,2019,39(3):688-695
巢湖十五里河沉积物硝化速率的城乡梯度变化及相关性
- Gradient variation and correlation of sediment nitrification rates in urban and rural areas of Shiwuli River, Chaohu Lake Basin
- 关键词：潜在硝化速率(PNR) 表面硝化速率(ANR) 沉积物 巢湖 十五里河
- 基金项目：国家自然科学基金项目（No.51579061）
- 作者
- 单位
- 李如忠
- 合肥工业大学资源与环境工程学院, 合肥 230009
- 戴源
- 合肥工业大学资源与环境工程学院, 合肥 230009
- 刘晓薇
- 合肥工业大学资源与环境工程学院, 合肥 230009
- 王莉
- 合肥工业大学资源与环境工程学院, 合肥 230009
- 摘要：2017年7月—2018年5月，在巢湖十五里河干流城乡梯度方向的5个采样点位，按两月一次的频率采集表层沉积物及其上覆水.在此基础上，开展沉积物硝化速率城乡梯度变化规律分析，并识别主要影响因素.结果表明：1十五里河水体氮磷污染严重，并具有氨氮浓度相对较高的污染特点；2潜在硝化速率（PNR）变幅为0.003~0.021 μmol·g-1·h-1，均值为0.011 μmol·g-1·h-1，没有表现出明显的城乡梯度规律；3表面硝化速率（ANR）变幅为0.73~15.23 μmol·m-2·h-1，均值为4.19 μmol·m-2·h-1，也未表现出明显的城乡梯度规律；4十五里河沉积物硝化速率季节性变化规律明显，基本表现为：夏季 > 春季 > 秋季 > 冬季，但5个采样点之间硝化速率的差异性程度不完全相同；5PNR与上覆水水温相关性较为显著，ANR与上覆水中NH4+-N和NO3--N存在显著相关性，沉积物中对PNR和ANR影响较为显著的因素都是TN、NH4+-N和pH.
- Abstract：Surface sediment and overlying water samples were collected every two months from five sampling sites in the main stream of Shiwuli River along the urban to rural gradient, Chaohu Lake basin, during July 2017 and May 2018. The gradient variability of sediment nitrification rates was analyzed and the main influencing factors were identified. The results show the investigated reaches were seriously polluted by nitrogen and phosphorus, and ammonia nitrogen presented high concentration. The potential nitrification rate (PNR) varied during 0.003~0.021 μmol·g-1·h-1 with a mean value of 0.011 μmol·m-2·h-1, and did not show a significant gradient variation from urban to rural areas. The areal nitrification rate (ANR) varied during 0.73~15.23 μmol·m-2·h-1 with a mean value of 4.19 μmol·m-2·h-1, and did not appear a significant gradient variation from urban to rural areas. The sediment nitrification rates presented significantly seasonal variation across the five sampling sites, with the nitrification rates in the following order:summer > spring > autumn > winter. However, the differences of nitrification rates among the five sampling sites were not identical. The significant correlation between PNR and temperature of overlying water, and between ANR and overlying water NH4+ and NO3-N were observed. The parameters TN, NH4+-N and pH in sediments were the major factors significantly influencing PNR and ANR.
- Key words：potential nitrification rate (PNR) areal nitrification rate (ANR) sediment Chaohu Lake Shiwuli River
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