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Nitrogen is one of the essential nutrients for the growth and reproduction of plants and microorganisms. More than 85% of the nitrogen in the soil exists as organic nitrogen. The traditional view is that organic nitrogen in soil must be completely mineralized into inorganic nitrogen before it can be used by microorganisms, namely mineralization-immobilization turnover, but some researches in recent years have proved that small molecule organic nitrogen can be Direct absorption and utilization by plants and microorganisms are called direct routes. The direct use of small-molecule organic nitrogen by soil microbes to influence the quantitative characterization of nitrogen use efficiency is one of the new hot spots in the study of nitrogen cycling and regulation in farmland ecosystems.
Based on this, Zhang Lili, an associate researcher in the Plant Nutrition and Fertilizer Section of the Institute of Applied Ecology, Chinese Academy of Sciences, has conducted related research work since 2011. In recent years, nitrogen isotope single labeling techniques have been used to investigate the effects and mechanisms of available carbon sources on amino acid absorption by soil microorganisms. The results showed that the addition of exogenous available nitrogen source ammonium sulfate and carbon source significantly affected the absorption and utilization of amino acids by soil microorganisms. When only nitrogen sources are added, the direct absorption of amino acids by soil microorganisms is the main direct route; when different proportions of glucose are added, soil microorganisms absorb amino acids through direct channels. With the consumption of available carbon sources, the amino acids absorbed by soil microorganisms are directly routed to minerals. Change the way of holding. The results were published in the journal Geoderma (2016, 283:28-32, DOI: org/10.1016/j.geoderma.2016.07.022) with the topic Available C and N affecting the utilization of glycine by soil microorganisms. The study was funded by the national key R&D project (2016YFD0300904) and the National Natural Science Foundation of China (41571290; 41301253; 41401291).
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