Research On The Soil Temperature Distribution In Orchard During The Winter Under Different Structure Forms Of Water Storage Pit

Low temperature in winter season, the temperature of the soil for plantingfruit trees is a very important role, because the temperature of the soil directlyaffects the plant root system, if the soil temperature is too low, can cause harm tothe plant roots, and even death, causing significant losses. Consequently, thediscretion of the soil temperature in winter, as a can be an important factor ofsafety for the winter.Water storage pit irrigation method is in view of the hills in the north ofChina in groves of drought and soil erosion problem and put forward a kind ofwater-saving irrigation measures, as a result of water storage pit under thecondition of water storage pit irrigation layout, increase the root zone of deepsoil of airport surface, improve the ventilation conditions, and the root zone soilprofile temperature distribution change, especially in winter low temperatureseason, fruit trees can survive safely the winter is popularization and applicationof the water storage pit irrigation method is one of the key problems. Waterstorage pit soil temperature during winter, therefore, to study the change rule ofstructure with different hole diameter, the application of water storage pitirrigation is vital to provide technical guidance.In this paper, through the field test and theoretical analysis of thecombination of different pithead structure under the influence of water storagepit soil temperature changes in the distribution of do the analysis, the mainresults were as follows:(1) Water storage pit pit of air temperature and atmospheric temperature change trend is consistent, with the air temperature rises, lower and lower.Between6PM-18:00, temperature first increases then decreases. At6PM and18:00, water storage pit pit air temperature is greater than the atmospherictemperature, and atmospheric temperature is less than no insulation cover waterstorage pit pit air temperature is less than the thermal insulation layer coveringthe air temperature in water storage pit pit and in12:00, on the contrary, pit airtemperature is less than atmospheric temperature, atmospheric temperature isgreater than no insulation cover water storage pit pit air temperature is greaterthan the thermal insulation layer are cover water storage pit pit air temperature.(2) Water storage pit pit air temperature, temperature difference decreaseswith the decrease of the hole diameter. Atmospheric temperature and the pit airtemperature difference value, will increase with the decrease of the craterdiameter and, temperature difference value increases with the decrease of thecrater diameter decreases; Have pit pit covered by air temperature, temperaturedifference than no pit pit covered by air temperature, temperature difference;Atmospheric temperature with pit pit covered by air temperature differencevalue is greater than the atmospheric temperature and no pithead covering the pitinside air temperature difference.(3) Water storage pit surface soil temperature, soil temperature includingwater storage pit water storage pit pit wall temperature and soil water storage pitbottom soil temperature. Water storage pit soil temperature under the influenceof atmospheric temperature, as the air temperature rises, lower and lower,between6PM-18:00, temperature increase first and then. Surface soiltemperature, soil water storage pit pit wall temperature, and water storage pit pitis similar at6:00and18:00soil temperature changes, the surface soiltemperature is greater than the atmospheric temperature, and increased with theincrease of soil depth increase, between5cm,15cm, and the extent oftemperature with the increase of soil depth, between15cm--25cm, and theextent of temperature with the increase of soil depth is not obvious, temperature basically remained stable. At12:00, surface soil temperature than the airtemperature, soil temperature decreases with the increase of soil depth, between5cm,15cm, and the range of the temperature decrease with soil depth, between15cm--25cm, and the range of the temperature decrease with soil depth is notobvious, temperature basically remained stable. With the increase of soil depth,the diurnal variation of the water storage pit soil temperature amplitudedecreases gradually, day change within5cm to15cm, within15cm--25cm,change is not obvious, basically stable. In addition, the water storage pit pit wallsoil temperature, soil temperature at20cm from the surface of the pit wall andthe pit walls with40cm soil temperature, compared with soil depth change ofthe amplitude and slightly more change in whole.(4) With the decrease of the crater diameter, water storage pit pit soiltemperature, soil water storage pit pit wall temperature and soil water storage pitbottom temperature) changing with the temperature of the soil depth value,reduces; Also would decrease as the daily variation range.(5) Have a thermal insulation layer water storage pit pit soil temperaturechanges with the depth of soil temperature value less than no thermal insulationlayer soil temperature change; With insulation layer water storage pit pit soiltemperature variation amplitude is smaller than without thermal insulation layerof soil temperature variation.