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用水分扩散装置测定了湖南祁阳低山丘陵红壤4个自然发生层土壤NO3--N的含量及水平运移状况,结果表明:硝态氮水平运移速率随土壤含水量增加而相应增加,呈指数曲线变化;随运移距离增加而迅速减小,呈幂函数曲线变化。硝态氮水平运移速率与运移距离均有很好的相关性。硝态氮水平运移浓度与土壤含水量密切相关,随含水量的增加而减少,并呈幂函数曲线变化。硝态氮水平运移浓度还受到土壤水分扩散率的影响,随土壤水扩散率的升高而下降,并呈对数曲线变化。硝态氮浓度最大值均出现在湿润锋(土壤干湿交界面)上。
The contents of NO3 - N and the horizontal migration of four naturally occurring soils in the hilly red soil of Qiyang, Hunan were measured by using a moisture diffuser. The results showed that the nitrate nitrogen transport rate increased with the increase of soil water content Exponential curve changes; with the migration distance increases rapidly decreases, showing a power function curve changes. There was a good correlation between nitrate nitrogen transport rate and migration distance. The concentration of nitrate nitrogen transport is closely related to soil water content, decreases with the increase of water content, and changes in power function curve. The concentration of nitrate-N transport was also affected by soil moisture diffusivity, which decreased with the increase of soil water diffusivity and showed a logarithmic curve. The maximum nitrate concentration appears in the wet front (soil wet and dry interface).