Nitrogen is one of the main factors limiting the productivity of various ecosystems. Soil organic nitrogen must be transformed into inorganic nitrogen (mainly ammonium nitrogen and nitrate nitrogen) that can be absorbed and utilized by plants through the action of soil microorganisms. This process is called nitrogen mineralization. The desalination ability directly reflects the nitrogen supply capacity of the soil and directly affects the amount of nitrogen fertilizer applied. Nitriding capacity is mainly related to the temperature and humidity in the soil. In 1972, Stanford and Smith published a classic article stating that In the temperature range (-4~40°C), the nitrogen mineralization rate increases as the temperature increases. In this paper, the research on this point is carried out. The detection and control of soil moisture temperature can be measured and analyzed using soil moisture thermometer.
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Using a soil moisture thermometry instrument to control the soil temperature at 5, 15 and 25°C, the soil moisture content was controlled at 30%, 50% and 70%, while soil nitridation was performed by measuring soil nitrate nitrogen and ammonium. After determining the nitrogen content and measuring the results, the data of the two were analyzed and processed. It was found that nitrification is dominated by the mineralization process, and the appropriate mineralization temperature range varies with the soil type, which is an indication of the evolutionary adaptation of nitrifying microorganisms. This study found that under the same water conditions, the maximum net mineralization rate appeared at 25°C, and the net mineralization rates at 5 and 15°C were significantly lower than 25°C, indicating that the net mineralization rate had a turning point at 15°C, indicating that there was 25°C In favor of nitrification of black soil, the critical temperature of nitrification in the soil of alfalfa grassland in autumn is about 15°C. At low temperature, both ages show net nitrogen retention. Under low temperature conditions, nitrogen mineralization mainly accumulates NH4+-N, which is expressed as nitrogen retention. This is because the process of nitrification is slowed down at low temperature, and nitrifying bacteria are more important than ammoniated microorganisms. It takes longer to adapt to the cold environment. As the culture temperature is gradually reduced, the microbiological nitrogen and total nitrogen retention rate will also increase due to the growth of suitable microbial populations.
From the correlation between temperature and net mineralization rate, it can be seen that the net mineralization rate is positively correlated with temperature, and the determination coefficient between the net nitrogen mineralization rate and temperature is basically higher than the determination coefficient between the net mineralization rate and moisture. Temperature is the main factor that determines the rate of mineralization.
