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| Alternating distribution of farmland and inhabited landscapes in Erhai Lake and the influence of circadian rhythm on the water quality of a ditch during flood |
| Received:September 02, 2018 Revised:October 17, 2018 |
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| KeyWord:Erhai Lake;non-point source pollution;abundant water period;ditch;water quality |
| Author Name | Affiliation | E-mail | | XIE Kun | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China
Dali Agro-Environmental Science Station, Ministry of Agriculture and Rural Affairs, Dali 671004, China | | | WU Fan | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China
Dali Agro-Environmental Science Station, Ministry of Agriculture and Rural Affairs, Dali 671004, China | | | LUO Yuan | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China
Dali Agro-Environmental Science Station, Ministry of Agriculture and Rural Affairs, Dali 671004, China | | | ZHANG Ke-qiang | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Dali Agro-Environmental Science Station, Ministry of Agriculture and Rural Affairs, Dali 671004, China | | | SHEN Shi-zhou | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Dali Agro-Environmental Science Station, Ministry of Agriculture and Rural Affairs, Dali 671004, China | | | WANG Shu-ru | Dali Agro-Environmental Science Station, Ministry of Agriculture and Rural Affairs, Dali 671004, China | | | WANG Feng | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Dali Agro-Environmental Science Station, Ministry of Agriculture and Rural Affairs, Dali 671004, China | wangfeng_530@163.com | | WU Guo-yun | Agricultural Comprehensive Service Center of Dali Wanqiao Town, Dali 671008, China | | | YAO Jin-ling | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | |
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| Abstract: |
| To elucidate the influence of farmland production, rural life, and circadian rhythm on the water quality of agricultural irrigation ditches, several sections of a typical ditch was selected for continuous sampling and monitoring at day and night during the wet season. The results showed that the concentration of TN, NO3--N, TP, and DP in the ditches along the direction of water flow was relatively stable and the concentration of NH4+-N and COD in the water reduced by 2.08%~55.56% and 23.65%~38.19% after exiting the field. Whereas, the concentration of NH4+-N and COD in the water increased after exiting the village. Nitrogen and COD were the major water pollutants in different production and inhabited units. NO3--N was the main form of N, accounting for 52.73%~79.33% of TN concentration. The concentration of TN and NO3--N in ditches is greatly affected by the work cycle and life rhythm of villagers. The diurnal variation in phosphorus concentration is generally small. Increasing the frequency of water sampling in alternate farmland and inhabited areas of Erhai Lake will help accurately understand the characteristics of water quality changes. Increasing the number of ecological ditches and strengthening the management of sewage pipelines are necessary to reduce pollution load. |
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