【摘要】 简述了土壤微生物生物量N的含量及其影响因素、土壤微生物量N的生物有效性、影响土壤无机氮生物固定的因素及土壤微生物量N的测定,明确了土壤微生物量N在土壤N素循环转化过程中的重要作用。土壤微生物量N是土壤N素转化的重要环节,也是土壤有效氮活性库的主要部分。土壤微生物量N对作物N素的供应起着重要调节作用。土壤无机氮的生物固定对减少N素损失,提高N肥利用效率和保护环境具有积极的作用。更多还原

【Abstract】 This thesis discusses the content and influential factors of soil microbial biomass nitrogen, deals with the biologic validity of soil microbial biomass nitrogen and the factors that influenced biologic fixation of soil inorganic nitrogen, expands the determination method of soil microbial biomass nitrogen and also makes clear the importance of microbial biomass nitrogen in the process of cycle and transformation of soil nitrogen. The soil microbial biomass nitrogen is an important transformation link of soil nitrogen. It is also the body of soil available nitrogen repertory. It plays an important regulation role to nitrogen supply of crops. The biologic fixation of soil inorganic nitrogen also plays positive roles in decreasing lose of nitrogen, increasing efficiency of nitrogen fertilizer and protecting environment.更多还原