The Periodicities Of Water Content And Temperature Variation For Tomatoes In The Cumulic Cinnamon Soils And The Loessial Soils

Soil water as the key link of the terrestrial water cycle process, is the link between thecentral land hydrological processes and ecological processes. Water condition is an importantfactor to cherry tomato physiology, yield and quality. Soil temperature not only affects cropgermination, root growth and physiological process, but also soil organic matter and nitrogenaccumulation, and water sports. By studying the soil water movement and the temperaturevariation in the loessial soils and cumulic cinnamon soils, researching under the influence ofdifferent conditions of tomato yield, leaf photosynthesis, soil respiration and the difference ofquality, finding out the effect on the yield and quality of tomato optimal cultivationconditions.To further improve the defense capability of the agricultural drought, effectivewater-saving irrigation planning, improving water use efficiency.In this paper we report the findings from experiments using soil columns to investigatechanges in water content and temperature in cumulic cinnamon soils and loessial soils whichwere used to grow cherry tomatoes (Lycopersivon esculentum Mill.). A mathematical modelfor soil water distributions was used to simulate the vertical changes in soils water, and asinusoid model was selected to analyse soil and air temperature as well as the changes in airhumidity. The experiment was studied in this paper in Institute of Soil and WaterConservation District conducted test sites, Northwest A&F University, Yangling, Shaanxirespectively on April28,2012to September19, April19,2013to August26. The soil test for2classes: cumulic cinnamon soils(C) and loessial soils(L); Soil relative water content of threelevels:90%to100%(Wh),70%to80%(Wm),50%to60%(Wl), a total of six processing(CWh, CWm.cwl, LWh, LWm, LWl), repeat8times on each processing, a total of48soilcolumn. The main results were as follows:1. the average soil water content and the infiltration rate in the cumulic cinnamon soilsare higher than those in the loessial soils. The temperature in the cumulic cinnamon soils ishigher than that in the loessial soils at the same depth. The soil temperature has obvioushysteresis as the depth increases. The water use efficiency of tomatoes in the loessial soils is higher than in the cumulic cinnamon soils. The air temperature, relative humidity, soiltemperature and soil water content influence one another.2. The mathematical model in this study effectively simulates the water movement in thesoil above20cm. Within the variable range of the variables in the mathematical equation, thewater content in the small depths can be accurately determined using the elapsed time in thecherry tomatoes at the full fruit period, which provides a theoretical basis for improving thedrought resistance, scheduling water-saving irrigation plans and improving water useefficiency.3.the soil respiration in the plant enhance alone with the soil temperature in the cherrytomato growth period, and drop from August. The soil respiration in high water treatment ishigher than middle water treatment, and higher than low water treatment, The soil watercontent is significantly influence the soil respiration.4.The respiration in the loessial soil is higher than cumulic cinnamon soils in the earlydays, and later the respiration in the cumulic cinnamon soils ia higher than loessial soils. Thewater consume and root weighe had a significant positive correlation with soil respiration, andthe product had a positive correlation with soil respiration.Soil water is a serious factor thansoil temperature to soil respirature.