Study Of N₂O Emissions In Different Fields Soil And Its Affecting Factors

N₂O is a kind of trace atmospheric gases, a component of greenhouse gas, its growing greatly harm to atmospheric ozone layer and the human body, and N₂O in the atmosphere mainly from microbes in the soil nitrification, denitrification , nitrification and denitrification by soil temperature, moisture content and texture, pH, organic matter content, nitrogen content, nitrogen and microbial species and the volume of activity, and many other factors in, for N₂O emissions from agricultural soils, and emissions of factors, emission reduction measures such as research, whether from an environmental or economic aspects are of great significance. Shaanxi is the main test of different types of soil for research, in various environmental factors - the depth, temperature, moisture content, temperature, nitrogen and organic matter, such as the accession conditions, N₂O emissions on the soil of the impact of research, to study Shaanxi different soil N₂O release of the differences and the related mechanism with a view to find a solution to reducing emissions of greenhouse gases in the atmosphere and studied the methods of soil future greenhouse gas emissions trends. Through studies following results:1. In different soil depth of the impact of N₂O emission and method of trial, loessial soil, Lou soil, the N₂O emission flux of the two territories with the depth of the trend were to rise further reduced, with the depth of the changes in loessial soil N₂O emission flux in the 20 cm depth reached the maximum, and in depth 10-25 cm Lou soil N₂O emissions in the accumulation to achieve the maximum and two soils 0-25 cm soil training depth -both N₂O emissions is significant Higher than 30-40 cm, and 40 cm soil training depth of the two N₂O emission minimum.2. In test of different water conditions on the soil texture impacting to N₂O emission, N₂O emission flux trend of loessial soil, Lou soil two soil samples at different humidity are the similar, with the rising water N₂O emission increasing, N₂O emissions to field capacity at the flux of the highest value, followed by a sharp drop; N₂O emission of two soil samples in the lowest wiling water level and high moisture content are almost zero or negative, that the low water content and High soil moisture content are not conducive to the release of N₂O. In the same temperature, time training conditions, N₂O emission of Lou soil moisture in the soil are higher than the loessial soil, that is, N₂O emission at a certain humidity conditions the loam soil type higher than the sandy soil.3.In the test of temperature in different soil conditions on the impact of N₂O emission flux, loessial soil and Lou soil samples in the temperature gradient changes in the N₂O emission trends similar to a general upward trend, with the temperature increase N₂O emissions flux increase, shows that temperature affected by nitrification, denitrification and molecular energy to influence the soil N₂O emissions flux, but N₂O emission significantly and are very volatile low in the conditions of 10℃ 15℃, that shows under the conditions of low temperature in the soil N₂O gas emissions role was inhibited. At the same temperature under the conditions of two soil samples N₂O emission flux tells us that Lou soil under the conditions of training temperature in the soil N₂O emissions-both higher than the loessial soil, that is loam soil type N₂O emission higher than the sandy soil type.4. Both Lou soil and loessial soil N₂O emissions are effected under the effect of adding nitrogen to the soil at a certain depth, with the loessial soil in the 0-15 cm soil depth, Lou soil 0-20 cm deep in the soil, adding nitrogen to the soil N₂O emission of the most significant impact, both the soil by adding nitrogen fertilizer on N₂O emission affected mainly concentrated in the scope of topsoil. This shows that farmland topsoil application of nitrogen fertilizer is produced N₂O emissions from the main field. At the higher temperature and humidity by adding nitrogen to the soil, the impact of N₂O emissions flux compared significantly.5. N₂O emission flux of different soil texture with training time was different, emission levels were: clay> clay loam> clay sandy loam> sandy soil.6. Two different soils by adding organic matter to soil N₂O emission implications, and mainly in the scope of topsoil (0-15 cm) impact on Lou soil and loessial soil, organic fertilizer and agricultural use mainly in the soil surface, which N₂O emissions from agricultural soils have a certain role.