Baking Temperature and Time on the Effect of Soil Meso-and Micro-fauna Separation Results

TIE Lie-hua;ZHANG Lin-cheng;FENG Mao-song;BAI Wen-yu;WANG Ling;HE Pei;College of Forestry,Sichuan Agricultural University;Pingchang Forestry Bereau;

baking temperatures;;baking time;;soil meso-and micro-fauna;;separation affect

【Objective】To explore the variation characteristics of soil meso-and micro-fauna baking insect separation effect with baking temperature and time,and to provide separation technology the basis for the study of soil meso-and micro-fauna research methods.【Method】The fauna baking of dry soil and wet soil were using Tullgren funnel method and Baermann funnel method respectively,and the thermostat was used to control cabinets temperature precisely.According to this,soil meso-and micro-fauna in two different species woodland and different soil depth were investigated.【Results】The number of soil meso-and micro-fauna was relatively large,and the abundance on per unit area of deep soil abundance was more than shallow.While the separation results of deep dry and wet soil meso-and micro-fauna were the ideal,the temperature were 34 ℃and 32℃respectively,and the baking temperature of shallow soil had been better to control at 36℃,in order to getting the better separation results.The process of baking soil meso-and microfauna could be completed within 18 hat exactly the right temperature,and that was mainly focused on the first 13 h,and 4hlatter,after beginning baking,the separation effects still remained high.Generally,variation of separation effect with baking temperature is a single pak curve,the baking temperature is too low or too high will affect the separation effect.When baking tempera-ture bellowed 35℃,the different of separation effect is also obvious.【Conclusion】The variation of separation effect with baking temperature generally showed a single peak curve,and the differences were significant,so it will affect the separation effects while the temperature is too low or too high.When baking temperature bellowed 35℃,the different of separation effect was also obvious.Baking separation effects have nothing to do with stand structure,but it relates to the depth of soil.There is no direct relationship between length of baking time and stand structure and the soil fauna's abundance on per unit area.But there is a relationship between the separation effects of dry soil fauna baking and soil animals categories.When the separation results of deep dry and wet soil meso-and micro-fauna are best,the temperature are 34 ℃ and 32 ℃.But the shallow soil is best to control the baking temperature at 36℃,in order to getting the better separation results.The process of baking soil meso-and micro-fauna can be completed in 18 h,and it is mainly concentrated at front 13 h.