The Characteristics Research Of Soil Temperature In Water Storage Pit Covered With Different Materials

The method of Water storage pit irrigation is professor sun put forward in2003aimed at our country northern mountainous orchard of water shortage and soil erosion problem. The biggest characteristic of water storage pit irrigation method is based on the characteristics of the fruit tree and the drought and soil and water loss in north China.it hand together water-saving irrigationand soil and water conservation. Research has made some achievements.Such as nutrient,moisture and evaporation. Temperature is one of the main influence factors in crop growth system. So the reseach of temperature characteristic of water storage pit irrigation method has important theoretical and practical significance.This paper study the temperature variation characteristics and seasonal temperature change characteristics mulched straw,plastic film and nothing.The results is:(1) The process of Atmospheric temperature and the air temperature in pit covered with film is a sine curve in a day.(2)The temperature of pit、pit wall and the bottle of pit is relatively stable in a day mulched straw.The amplitude are less than no cover and plastic mulching. when the outside cold,the pit coverd with straw have a warming effect; outside heat, have a cooling effect.(3) The daily average temperature is higher covered with plastic and the soil temoerature.(4)The mode of no cover and plastic film mulching,0～10cm away from the pit wall and the bottle of pit temperature daily range is bigger; Distance from the pit wall and the bottom is greater than15cm of water storage pit wall and pit bottle,soil temperature with the increase of the distance is no longer change.(5)The horizontal layers, with the increase of distance from the surface,the soil temperature maximum daily amplitude decreases vertical direction, with the increase of distance from the earth’s surface, soil temperature maximum amplitude decreases.(6) Average daily temperatuer is highest in the bottom of pit covered with plastic film.Any mulching method, along with the increase of soil depth, bottom soil daily average temperature to heat up, first to cool again, finally stabilized.(7)6:00、14:00and18:00three moments can briefly characterize the temperaturethe in water storage pit.different treatments on soil20cm and25cm of the soil temperature have little effect.(8) Establish related model of the typical temperature characterization under different coverage measures.The results show that that different treatment8:00soil temperature increases with the increase of distance from the pit wall. the5-20cm depth change basic as the linear function relation.14:00soil temperature decreases with the increase of distance from the pit wall. soil temperature in5-10months covered with plastic film and5-8month covered with nothing can be expressed in a quarter of the elliptic curve;18:00soil temperature can be roughly divided into two kinds of circumstances:one situation:the surface temperature is high.It decrease with the increase of depth to ground.It shows good linear relationship, another case is when the outside temperature is low, the highest temperature is in commonly10cm depth,as the deep grow, geothermal decreasing gradually, and has good linear relationship.(9)The temperature is high in20cm from the surface than40cm in hot months, the temperature is low in20cm from the surface than40cm in cool months.