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The study of groundwater chemical varieties has a positive indicator effect on the regulation and improvement of regional groundwater quality caused by infiltration in the Yellow River Irrigation Area. The field in-situ infiltration test was carried out to monitor and analyze the recharge water-groundwater during the recharge process of paddy field and dry field, and the groundwater chemical evolution law was revealed by AquaChem hydrochemical analysis and SPSS mathematical statistics. Under the condition of infiltration, the characteristics of groundwater chemical change show four evolution processes: "rapid change and active zone in the early stage, gradual transition zone in the middle stage, gentle and stable zone in the late stage, and potential recovery zone after stopping irrigation". It can be seen from the experiment that the groundwater is mainly affected by the physical mixing of recharge water, accompanied by the water-rock physical adsorption ion exchange, chemical dissolution and leaching, etc. especially, the amount of recharge water in paddy field was large, and the water quality of recharge determined the direction of groundwater chemical evolution. At the same time, the concentrations of Na+、Cl- of groundwater chemical components showed a good linear change, and the correlation coefficient was above 0.93, and the concentrations of Ca2+、Mg2+ showed a certain linear correlation with SO42-、HCO3-. After stopping irrigation, the evaporation and concentration of groundwater was strong, and the ions of groundwater showed an increasing trend. Especially for Na+、Cl-, the drainage and precipitation are timely needed after the irrigation. The research shows that the water supply of groundwater not only enriched groundwater sources, but also improved groundwater quality.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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