【摘要】 综述了免耕方式下农田土壤中3种主要温室气体(CO2、N2O和CH4)的排放情况及影响因素。分析发现,这些温室气体的排放受到诸多因子的影响,如免耕农作持续时间、土壤特性、秸秆(种类、粉碎长短和施用方式)、降水和土壤温度等等。大多数研究都认为,免耕方式下CO2和CH4的释放有所降低,N2O的释放会加强,但这种结果并不是不变的,它会随着影响因素的变化而变化,有时甚至出现相反的结果。因此,免耕方式下,温室气体的排放情况是由不同免耕地区的环境条件决定的,只有结合当地实际情况才能对温室气体的排放做出正确的评价。最后指出了目前研究的不足,并对今后的研究提出了展望。更多还原

【Abstract】 The emission of three greenhouse gases(CO2,N2O and CH4) in soil under the no-tillage cultivation was studied in this paper based on recent advances.The result showed that the emission of these gases were influenced by many factors,such as no-tillage cultivation duration,the characteristic of soil,residue,precipitation,soil temperature and so on.Most studies considered that the emission of CO2 and CH4 would decline,while N2O emission would increase in no-tillage soil.But this conclusion is not correct in any case,and it will change or even reverse sometimes with the change of these factors.So,the emission of these gases is determined by the environment conditions of different no-tillage soil,and we can make a reliable evaluation only according to the actual situation.At last,we pointed the deficiency of current research,and proposed the preliminary prospect for further study.更多还原