| 申雅莉,周脚根,彭佩钦,吴金水.亚热带源头流域梯级池塘氮磷含量的时空变异及其影响因素[J].农业环境科学学报,2020,39(10):2420-2428. |
| 亚热带源头流域梯级池塘氮磷含量的时空变异及其影响因素 |
| Spatio-temporal variation of nitrogen and phosphorus contents in cascade ponds in subtropical headstream watershed and its influencing factors |
| 投稿时间：2019-11-15 |
| DOI：10.11654/jaes.2019-1257 |
| 中文关键词: 梯级池塘 氮 磷 时空变异 土地利用 养鱼 |
| 英文关键词: cascade ponds nitrogen phosphorus spatial-temporal variation land use fish farming |
| 基金项目:国家重点研发计划项目（2017YFD0800504）；国家自然科学基金项目（41877009） |
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| 中文摘要: |
| 研究亚热带源头流域梯级池塘氮磷含量的变异机制，有利于理解农业小流域池塘水体氮磷面源污染的发生机制。本研究以亚热带红壤丘陵区典型农业小流域——金井小流域为研究区，选择18组典型梯级池塘（每组上、下游池塘各1个，共36个池塘）进行长期定位观测，采用2017年6月到2018年5月期间共12个月梯级池塘水体氮磷的定位观测数据，分析总氮（TN）和总磷（TP）含量的时空变异及其影响因素。结果表明：梯级池塘水体TN含量呈现上游（1.86 mg·L-1）低于下游（2.56 mg·L-1），TP含量上游与下游接近，且上下游池塘TN和TP含量趋势在旱季偏高；梯级池塘水体TN和TP指标超标严重，超标率72.8%以上；周边土地利用类型和养鱼影响了梯级池塘水体TN和TP含量，相对不养鱼池塘，养鱼池塘水体TN和TP含量分别增加了60%、34%。研究结果表明，农业土地利用和养鱼加剧了研究区梯级池塘水质恶化，加强农田面源污染和水产养殖管理有助于梯级池塘水质提升。 |
| 英文摘要: |
| The study of spatial-temporal variability of nitrogen and phosphorus in cascade pond systems helps to understand the mechanism of occurrence of non-source N and P pollution in ponds of agricultural watersheds. The typically subtropical hilly watershed of Jinjing was used as the study region. The total nitrogen(TN)and total phosphorus(TP)concentrations were measured in 18 groups of cascade ponds(36 ponds in total)from June 2017 to May 2018. The spatial-temporal variability and its drivers of TN and TP contents were explored using the observations of the consecutive 12 months. The averaged TN concentrations were lower in the upstream ponds(1.86 mg·L-1)than those in the downstream ponds(2.56 mg·L-1), and the upstream TP contents were close to the downstream ones. Generally, high TN and TP contents occurred in upstream and downstream ponds during the dry seasons. The pollution of TN and TP was serious in the observed ponds. According to the national surface water quality standard, the water quality of more than 72.8% of observations in upstream and downstream ponds worse than the Class Ⅲ of surface water standard. The TN and TP contents in the cascade ponds were affected by the surrounding landuse types and fish farming. Compared to non-fish farmed ponds, fish farming increased the TN and TP contents by 60% and 34%, respectively. The study suggestes that agricultural land use and fish farming exacerbate the deterioration of the water quality of TN and TP in cascade pond systems. Strengthening the prevention and control of non-source pollution from farmland and aquaculture management will help the improvement of the water quality of TN and TP in ponds of the subtropical agricultural watershed. |
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