Effects of different screening methods on soil aggregates and soil microbial communities
This research aimed to explore the influence of soil aggregate composition,stability,organic carbon content and microbial number under different screening methods,and optimize the aggregate screening methods.Black soil was taken as the research object,four treatments with different screening methods were set up,including dry screening of dry soil,wet screening of dry soil,dry screening of moist soil,and wet screening of moist soil.The advantages and disadvantages of these screening methods were compared.The results showed that soil aggregates with particle size≥2 mm of the dry screening of moist soil treatment was about 85.97%higher than that of the wet screening of dry soil treatment.While for the aggregates in the particle size of 2-0.25 and≤0.25 mm,the wet screening of dry soil treatment had the highest proportion and was about 80.90%and 91.82%higher than those of the moist soil of dry screening,which were the lowest.The content of≥0.25 mm water-stable aggregate(R0.25)reached the highest value of 99.35%under the dry screening of moist soil.The higher the value,the better the stability of soil aggregate and the stronger the soil corrosion resistance.The distribution of soil organic carbon in each particle size aggregate was on average under the treatment of wet screening of dry soil.The number of soil bacteria and actinomycetes was the highest under the wet screening of dry soil treatment.However,the number of soil fungi under the treatment of dry screening of moist soil was higher,which was significantly different from the three treatment methods of wet screening of moist soil,dry screening of dry soil and wet screening of dry soil.To sum up,it is found that the stability of soil aggregates is better and the number of soil microorganisms is higher under the treatment of wet screening of dry soil,which plays an optimization role in soil structure and soil quality to a certain extent.
soil aggregatequantity of soil microorganismblack soilscreening method
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