摘要
通过人工模拟冻融过程,研究了不同冻融条件对黑土中N2O释放特性影响。结果表明,在含水量一定的前提下,黑土N2O的释放量随着施氮量的增加而增大,主要表现为,高氮处理的N2O排放通量比低氮处理增加了20.4%,常氮处理比低氮处理增加了16.1%,而高氮处理比常氮处理的增加了8.1%,两者差异并不显著。在施氮量一定的前提下,黑土中N2O的释放量随含水量的增大而增大。在含水量为15%、20%、25%的黑土中,N2O累积排放通量分别为2644、2930和3640μg·(m2·h)-1;土壤粒径也影响黑土中N2O的释放,但是影响并不显著;土壤酸化加剧黑土中N2O的释放。
In order to investigate the effects of different freezing and thawing conditions on nitrous oxide release in the black soil,artificial simulation freeze- thaw processes were carried out. With the same soil moisture content,the results showed that the nitrous oxide releases in the black soil increased stronger with amount of nitrogen applied increasing. N2 O emission fluxes under high nitrogen treatments were20. 4% higher than that under low nitrogen treatments. Constant nitrogen treatments were 16. 1% higher than low nitrogen treatments. However,high nitrogen treatments were 8. 1% higher than constant nitrogen treatments. With the same amount of nitrogen applied,the results showed that the nitrous oxide release in the black soil would be stronger with soil moisture content increasing. When the soil moisture content of 15%,20%,25%,the accumulations of N2 O emission flux were respectively 2644,2930 and 3640 μg·( m2·h)- 1. Soil particle size also affected N2 O emissions in the black soil,but the impact was not significant. Acidification could exacerbate release of N2 O in the black soil.
出处
《环境与发展》
2014年第4期42-45,共4页
Environment & Development
关键词
黑土
冻融交替
酸化
氧化亚氮
Black soil
Freeze-thaw action
Acidification
Nitrous oxide
