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| Evaluation of water quality status in the main oasis agricultural areas of the Qaidam Basin, China |
| Received:July 09, 2020 |
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| KeyWord:oasis agricultural district;cultivated land;surface water;groundwater;water quality identification index;Qaidam Basin |
| Author Name | Affiliation | E-mail | | GUO Qing-bo | Key Laboratory of Plant Nutrition and Agri-environment in Northwest China, Ministry of Agriculture and Rural Affairs, College of Natural Resource and Environment, Northwest A&F University, Yangling 712100, China | | | HUANG Yi-mei | Key Laboratory of Plant Nutrition and Agri-environment in Northwest China, Ministry of Agriculture and Rural Affairs, College of Natural Resource and Environment, Northwest A&F University, Yangling 712100, China | ymhuang1971@nwsuaf.edu.cn | | JIA Peng-hui | Key Laboratory of Plant Nutrition and Agri-environment in Northwest China, Ministry of Agriculture and Rural Affairs, College of Natural Resource and Environment, Northwest A&F University, Yangling 712100, China | | | LI Hao-hao | Key Laboratory of Plant Nutrition and Agri-environment in Northwest China, Ministry of Agriculture and Rural Affairs, College of Natural Resource and Environment, Northwest A&F University, Yangling 712100, China | |
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| Abstract: |
| In order to understand the impact of agricultural planting on the regional water quality in the Qinghai-Tibet Plateau, 70 sampling sites were set up in 9 typical villages and towns in the main oasis agricultural areas of the Qaidam Basin. Through field investigation and sampling, indicators such as total phosphorus, nitrate nitrogen, chloride, sulfate, heavy metals, and pesticides in surface water and groundwater were measured to analyze the influence of farming activities on surface water and groundwater. The comprehensive water quality index of the surface water in the study area was 2.100. The comprehensive water quality was Class Ⅱ of the Surface Water Environmental Quality Standard(GB 3838-2002). The comprehensive surface water quality of Gahai Town, Golmut Town, Golmud City, and Dagele Township reached Class Ⅰ. The concentrations of total phosphorus in Xiangride Town and Chahanwusu Town and the COD concentration in the surface water of Delingha were inferior to Class V, with chloride, sulfate, and nitrate nitrogen exceeding the standards at 20%, 6.67%, and 1.67% of the total sampling points, respectively. The comprehensive water quality index of groundwater was 2.300, and the comprehensive water quality was Class Ⅱ of the Groundwater Quality Standard(GB/T 14848-2017). The chloride concentrations in Huaitutala Town, Dagele Township, and Chahanwusu Town and the sulfate concentration in Huaitutala Town were 2.83, 1.13, 1.07 times, and 1.92 times greater than the sanitary standard value of drinking water, respectively; thus, the water was not potable. The concentrations of heavy metals and pesticides in the study area were extremely low. The concentrations of lead, copper, and arsenic were lower than the standard limit for surface water and groundwater Class Ⅰ. The concentrations of acetamiprid, chlorpyrifos, and abamectin in pesticides were 0.01%~0.21%, 0.12%, and 0.93% of the standard values, respectively. The concentrations of total phosphorus and nitrate nitrogen in the irrigation drainage increased by 37.80% and 24.43%, respectively. The water quality of the oasis agricultural area in the Qaidam Basin is generally good, but agricultural farming activities will still have an impact on the regional water quality. |
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