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| Comprehensive evaluation of water quality changes in agricultural irrigation ditches in the rainy season under different planting patterns in the west of Erhai， China |
| Received:June 30, 2020 |
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| KeyWord:Erhai;planting pattern;farm irrigation ditches;pollution characteristics;comprehensive evaluation |
| Author Name | Affiliation | E-mail | | XIE Kun | 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 | | | LUO Yuan | 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 | | | FENG Yi-yang | 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
College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | HE Qiu-ping | 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
College of Grassland and Environment Science, Xinjiang Agricultural University, Urumqi 830052, 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 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 |
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| Abstract: |
| The purpose of this study is to reveal the comprehensive influence of different planting patterns on the water quality and rate of pollutant contribution by irrigation ditches in the rainy season in the west of Erhai Basin. Agricultural irrigation ditches were selected in four areas planted with tobacco, seedlings, vegetables, and rice. By analyzing the changes in COD, TN, TP, and NH4+-N concentrations, the comprehensive average pollution index method and "centralized" gray pattern recognition model were used to comprehensively evaluate the water quality of the ditch. The results showed that vegetable and tobacco planting had the largest contribution to TN and TP loss, respectively, in ditch runoff. NO3--N was the main form of TN and accounted for 60.43%~81.35% in the ditch runoff water. DTP was the main form of TP and accounted for 74.16%~77.95% in ditch runoff. The results of the comprehensive average pollution index method showed that TN and COD were the main factors affecting the water body; the pollution ratio was 14.06%~56.95% and 20.03%~37.19% respectively. The results of the gray pattern recognition model analysis showed that the pollution index per hectare planting area(ΔGC·hm-2)was vegetable field (0.057 2)> tobacco field (0.015 5) >seedling field (0.014 1) >rice paddy (0.000 2). |
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