通过对不同肥力水平黑土、棕壤、黄棕壤、红壤土壤微生物量碳氮的比较，研究和探讨土壤微生物量碳氮与土壤肥力的关系。
To find out the relationship between soil microbial biomass C and N and soil fertility, soil microbial biomass C and N were compared in several types of soil with different fertilization levels.
不同种植年限苜蓿地土壤微生物量碳、氮存在差异。
There were obvious difference on soil microorganism carbon and nitrogen among different alfalfa grounds.
实验研究了双氰胺在玉米苗期对土壤微生物细菌、霉菌和放线菌的影响，及对土壤中铵态氮和硝态氮贮量变化的影响。
This paper reports the effect of DCD in seedling stage to soil microorganism of bacteria, mold and actinomycetes, and the concentration changes of both ammonium nitrogen and nitrate nitrogen in soil.
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