施氮量对烟田CO2排放及土壤温度和水分的影响

Effects of nitrogen fertilizer application on CO2 emission,soil temperature and moisture in tobacco fields

为了深入了解氮肥施用量对烟田碳排放的影响,采用大田试验方法设置了不同地区不同烟草品种的氮肥试验。结果表明,施氮量为75kg/hm^2时,烟田CO2的排放速率和硝态氮含量明显提高;氮肥施用对土壤温度的影响较小,对土壤水分基本没有影响,两地土壤含水量的变化主要是与当地降雨有关;总体上,土壤CO2排放与土壤温度在高氮肥施用处理下(75kg/hm^2)显著相关,与土壤水分含量相关性较差。

In order to investigate the effects of nitrogen fertilizer application on carbon emission in tobacco field, a field experiment was conducted with different tobacco varieties in different areas. The results showed that the CO2 emission rate and nitrate nitrogen content in tobacco field increased significantly when the nitrogen application rate was 75 kg/hm^2. Nitrogen application had little effect on soil temperature, and had no effect on soil moisture. The change of soil water content was mainly related to local rainfall. In total, the soil CO2 emissions was significant correlated with soil temperature when the nitrogen application rate was 75 kg/hm2, and has a poor correlation with soil moisture.