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一、沼池设计依据我国北方地区气温较低,雨水偏少。以辽宁省为例,年平均气温5～11℃,极端最低温度-40℃,月均温度变幅较大,低于零度全年长达5个月,月均气温高于18℃仅有四个月。土壤结冻是北方地区制约沼池温度变化重要因素。每年进入11月份后,冻土深度50～140厘米。翌年3月土壤化冻前池温高于土温,土壤化冻后,土温回升较快,土温又逐渐高于池温。进入9月份气温明显下降后,池温又高于土温,全年在常温发酵条件下,两者始终仅相差1～2℃。冻土的出现明显制约池温变化,同时又影响池体结构性。依据观测资料,总结几年来建池技术和北方农村自然条件,提出了沼池设计思想:1.池
First, the marsh design based on the low temperature in northern China, less rainfall. Taking Liaoning Province as an example, the annual average temperature is 5 ~ 11 ℃ and the extreme minimum temperature is -40 ℃. The average monthly temperature fluctuates greatly. If the monthly average temperature is lower than 0 ° C for up to 5 months and the monthly average temperature is higher than 18 ° C, only 4 Months. Soil freezing is an important factor restricting the temperature changes in the marsh in the north. After entering in November every year, frozen soil depth of 50 to 140 cm. In March next year soil thawing temperature is higher than soil temperature, soil thawing, soil temperature rise faster, soil temperature and gradually higher than the pool temperature. Into the September temperature dropped significantly, the pool temperature is higher than the soil temperature, the annual fermentation conditions at room temperature, the two have only a difference of 1 ~ 2 ℃. The appearance of frozen soil obviously restricts the change of the temperature of the pool, meanwhile affects the structure of the pool body. Based on the observation data, summarizes the past few years to build pool technology and natural conditions in rural areas in northern China, put forward the design idea of the marsh: 1. Pool