Under the influence of the natural and human factors, water table of irri- gated area Changes frequently, but it is mainly affected by irrigation water infiltration replenishment during the irrigation. 5 groundwater o...Under the influence of the natural and human factors, water table of irri- gated area Changes frequently, but it is mainly affected by irrigation water infiltration replenishment during the irrigation. 5 groundwater observation wells were constructed in experimental plot of the Daxia irrigated area to carry out the experiment of the effect of irrigation on groundwater dynamic change in this research. The results showed that the groundwater stage dynarnic change rule of spring and seedling irri- gation stage in the typical plot was fit to the hydrological geology condition of grade- I terrace of Huangshui river valley. On the whole, lateral canal water direction formed a line effect. The No. 1 and No. 2 observation well were the closest to the lateral canal, which received more supplies, and the water level was the highest; the No, 3 observation well took the second place; The No. 4 and No. 5 observation well accepted least supplies, and the water level was the lowest. The rangeability of water table of spring irrigation period was significantly higher than that of seedling irrigation period, this is mainly due to the difference value of intake water volume and drainage water volume of spring irrigation phase was significantly higher than the seedling irrigation phase.展开更多
Assessing the microbiological quality of irrigation water is essential for ensuring the proper functioning of irrigated agricultural areas and securing optimal rice production yields.This study aims to evaluate the mi...Assessing the microbiological quality of irrigation water is essential for ensuring the proper functioning of irrigated agricultural areas and securing optimal rice production yields.This study aims to evaluate the microbiological quality of irrigation water and the potential risks it poses to rice cultivation in M’Bahiakro.The adopted methodology involved identifying microbial pollution indicators such as total coliforms,fecal coliforms,Escherichia coli,and fecal streptococci.Water samples were collected from three(03)monitoring stations during both the dry and rainy seasons.The qualitative and quantitative identification of these microorganisms was performed by filtering 100 mL of water through a cellulose membrane filter(MF)with a uniform pore diameter of 0.45μm.The risk to rice production was assessed using the IBQ6 index method.Results revealed high contamination levels in the irrigation water,characterized by elevated loads of total and fecal coliforms,fecal streptococci,and E.coli,both upstream and downstream of the dam,thereby exposing rice farming to significant health and agronomic risks.This microbial pollution is exacerbated during the dry season,when the IBQ6 scores indicate poor water quality(34-35/100),threatening both crop yields and farmers’health.A slight improvement is observed during the rainy season due to dilution effects(IBQ6:54-63/100),although the water quality remains insufficient to ensure sustainable irrigation.Furthermore,high concentrations of nutrients such as phosphorus and ammonia intensify anthropogenic pressure and the risks of eutrophication.These findings underscore the need for integrated water resource management,including pollution source control,community awareness initiatives,and the implementation of ecological or physical barriers to limit the spread of pathogens.展开更多
基金Supported by Water Consumption Coefficient Research in Irrigated Area in the Yellow River Areas in Qinghai Province(QX2012-019)
文摘Under the influence of the natural and human factors, water table of irri- gated area Changes frequently, but it is mainly affected by irrigation water infiltration replenishment during the irrigation. 5 groundwater observation wells were constructed in experimental plot of the Daxia irrigated area to carry out the experiment of the effect of irrigation on groundwater dynamic change in this research. The results showed that the groundwater stage dynarnic change rule of spring and seedling irri- gation stage in the typical plot was fit to the hydrological geology condition of grade- I terrace of Huangshui river valley. On the whole, lateral canal water direction formed a line effect. The No. 1 and No. 2 observation well were the closest to the lateral canal, which received more supplies, and the water level was the highest; the No, 3 observation well took the second place; The No. 4 and No. 5 observation well accepted least supplies, and the water level was the lowest. The rangeability of water table of spring irrigation period was significantly higher than that of seedling irrigation period, this is mainly due to the difference value of intake water volume and drainage water volume of spring irrigation phase was significantly higher than the seedling irrigation phase.
文摘Assessing the microbiological quality of irrigation water is essential for ensuring the proper functioning of irrigated agricultural areas and securing optimal rice production yields.This study aims to evaluate the microbiological quality of irrigation water and the potential risks it poses to rice cultivation in M’Bahiakro.The adopted methodology involved identifying microbial pollution indicators such as total coliforms,fecal coliforms,Escherichia coli,and fecal streptococci.Water samples were collected from three(03)monitoring stations during both the dry and rainy seasons.The qualitative and quantitative identification of these microorganisms was performed by filtering 100 mL of water through a cellulose membrane filter(MF)with a uniform pore diameter of 0.45μm.The risk to rice production was assessed using the IBQ6 index method.Results revealed high contamination levels in the irrigation water,characterized by elevated loads of total and fecal coliforms,fecal streptococci,and E.coli,both upstream and downstream of the dam,thereby exposing rice farming to significant health and agronomic risks.This microbial pollution is exacerbated during the dry season,when the IBQ6 scores indicate poor water quality(34-35/100),threatening both crop yields and farmers’health.A slight improvement is observed during the rainy season due to dilution effects(IBQ6:54-63/100),although the water quality remains insufficient to ensure sustainable irrigation.Furthermore,high concentrations of nutrients such as phosphorus and ammonia intensify anthropogenic pressure and the risks of eutrophication.These findings underscore the need for integrated water resource management,including pollution source control,community awareness initiatives,and the implementation of ecological or physical barriers to limit the spread of pathogens.
