| 胡钰,王业耀,滕彦国,香宝,马广文,方广玲.阿什河流域非点源氮污染的δ15N源解析研究[J].农业环境科学学报,2015,34(12):2327-2335. |
| 阿什河流域非点源氮污染的δ15N源解析研究 |
| Source Apportionment of Non-point Source Nitrogen Pollution in Ashi River Basin Using δ15N Technique |
| 投稿时间：2015-06-20 |
| DOI：10.11654/jaes.2015.12.011 |
| 中文关键词: 非点源污染 氮同位素 氮污染特征 |
| 英文关键词: non-point source pollution δ15N-NO3- isotope tracers nitrogen pollution |
| 基金项目:国家水专项(冻融条件下农田非点源污染过程和水质目标管理技术研究,2014ZX07201-009-01) |
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| 中文摘要: |
| 农业活动往往沿着河流而发展,其产生的氮污染极大地影响了流域水质量。选择以种植业为主的阿什河作为典型流域,利用水质、土壤监测技术和15N稳定同位素示踪技术,对流域水体氮污染、种植业土壤氮特征以及氮污染来源进行解析。结果表明阿什河水质总氮浓度较高,氮污染较严重;位于上游的采样点水质较好,中游开始到下游水质逐渐恶化。种植业对于流域水体氮污染的影响根据水期以及种植周期的不同而有着不同的影响方式:平水期以种植业非点源氮污染为主要污染源的区域主要分布在中下游处,其δ15N值为0.46%～0.77%,表现为人工合成化肥和农田退水造成的土壤有机氮污染;丰水期以种植业非点源氮污染为主要污染源的区域较多,其δ15N值集中在0.19%～0.40%;上游地区以人工合成化肥为主要污染源,中下游以雨水及灌溉冲刷种植区土壤而形成的土壤有机氮来源为主。枯水期也有部分地区受到以人工合成化肥为主要污染源的氮污染,其δ15N值为0.11%～0.38%,主要是由于雨季人工合成化肥中的硝态氮下渗到土壤下层,当枯水期时地下径流补给河流,其中滞留的硝态氮对河水造成污染。 |
| 英文摘要: |
| Crop farming activities along river have significantly affected the quality of river water. In this paper, nitrogen pollution in river water basin, nitrogen characteristics in crop farming soil and nitrogen pollution origins were investigated in the Ashi River basin, using water quality and soil monitoring techniques as well as 15N stable isotope. Results showed that there were high nitrogen concentrations in Ashi River water. The water quality was relatively good in the upstream section of the river, but gradually became worse in the midstream and downstream sections. This pattern is closely related to the land use types and human activities. The impacts of crop farming on water nitrogen pollution were dependent on river water seasonal periods and farming cycles. During the normal water period, non-point nitrogen pollution by crop farming occurred mainly in the midstream and downstream sections, with δ15N value ranging from 0.46% to 0.77%. The pollution sources were primarily artificial chemical fertilizers and farmland water recession. During the high water period, the pollution from non-point nitrogen extended to the upstream area, with δ15N range of 0.19%~0.4%. The main pollution source was artificial chemical fertilizers in the upstream area, while it was soil organic nitrogen via soil erosion caused by rainfall and irrigation in the midstream and downstream. During the low water period, however, artificial chemical fertilizers were still the main contributor of non-point nitrogen pollution, with δ15N values of 0.11% to 0.39%. This was resulted from the feedback of the nitrite-nitrogen from artificial chemical fertilizers that were applied and infiltrated in the ground during the monsoon. |
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