In order to know the factors affecting the water temperature of buried agricultural wastewater treatment equipment,the annual data of water temperature and air temperature of two buried equipment in the southern Jiangsu region were monitored,and the relationship between equipment water temperature and air temperature was analyzed.It was concluded that March to August was the period of water temperature rise,during which the water temperature was about 1.2-8.6 ℃ lower than the air temperature;September to February is the period of water temperature decline,during which the water temperature is about 0.2-12.8 ℃ higher than the air temperature;Water temperature changes lag behind air temperature changes,and the amplitude of water temperature change is significantly smaller than that of air temperature change;The Sine fitting curve was obtained by fitting the relationship between air temperature and average water temperature,with R2=0.970 76.Furthermore,the relationship between equipment water temperature and burial depth was analyzed,and it was found that the deeper the equipment is buried,the smaller the amplitude of water temperature change,and the weaker the sensitivity of water temperature to temperature.
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