亚热带土壤氮素反硝化过程中N2O的排放和还原

被引：26

作者：

续勇波

蔡祖聪

机构：

[1] 中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室

来源：

环境科学学报 | 2008年 / 04期

关键词：

土壤性质; 厌氧培养; N2O; 红壤;

D O I：

10.13671/j.hjkxxb.2008.04.031

中图分类号：

S153 [土壤化学、土壤物理化学];

学科分类号：

摘要：

将采集于江西鹰潭的45个发育于不同成土母质和不同利用方式的土壤样本,在密闭、淹水、充N2的严格厌氧条件下进行了28d的培养试验(30℃),在培育过程中,定期测定NO3-N(加入量为200mg·kg-1)含量和培养瓶上部空间N2O的含量变化.实验结果表明,N2O含量(N)随培养时间t的变化可用方程N=A×(1-exp(-k1t))?B×exp(k2t)拟合(A表示培养过程中N2O总排放量;B为常数;k1和k2分别为N2O排放速率常数和还原速率常数,拟合值和实测值之间回归方程的决定系数R2=0.84±0.11).不同土壤之间培养期间N2O总排放量(A)的变异可以用培养7d内被反硝化的NO3-N量和N2O排放率(A值与28d内被反硝化的NO3-N总量的百分比)进行解释(R2=0.829,p<0.01).被反硝化的NO3-N量则主要受土壤有机碳含量或有机氮矿化量控制,N2O排放率则随k2的增大而呈指数下降(p<0.01).由此可见,在该实验条件下,还原N2O能力强的土壤,在相同量的NO3-N被反硝化的情形下,排放的N2O可能较少.但影响k2值的主要因素还有待进一步研究.

引用

页码：731 / 737

页数：7

共 8 条

[1] Sustainable nitrogen elimination biotechnologies: A review[J] . Young-Ho Ahn.Process Biochemistry . 2006 (8)
[2] Nitrogen oxides emission from soils bearing a potato crop as influenced by fertilization with treated pig slurries and composts
Vallejo, Antonio
Skiba, Ute M.
Garcia-Torres, Lourdes
Arce, Augusto
Lopez-Fernandez, Susana
Sanchez-Martin, Laura
[J]. SOIL BIOLOGY & BIOCHEMISTRY, 2006, 38 (09) : 2782 - 2793
[3] Nitrous oxide production and consumption in serially diluted soil suspensions as related to in situ N2O emission in submerged soils
Mei, LJ
Yang, LZ
Wang, DJ
Yin, B
Hu, H
Yin, SX
[J]. SOIL BIOLOGY & BIOCHEMISTRY, 2004, 36 (07) : 1057 - 1066
[4] The effect of oxygen, pH and organic carbon on soil-layer specific denitrifying capacity in acid coniferous forest[J] . A.M. Laverman,H.R. Zoomer,H.A. Verhoef.Soil Biology and Biochemistry . 2001 (4)
[5] Physical properties and mechanisms of formation of nitrous oxide[J] . William C. Trogler.Coordination Chemistry Reviews . 1999 (1)
[6] N 2 , N 2 O and O 2 Profiles in a Tagus Estuary Salt Marsh[J] . P. Cartaxana,D. Lloyd.Estuarine, Coastal and Shelf Science . 1999 (6)
[7] Soil pH affects the processes reducing nitrate to nitrous oxide and di-nitrogen[J] . R.J. Stevens,R.J. Laughlin,J.P. Malone.Soil Biology and Biochemistry . 1998 (8)
[8] Quantitative assessment of Soil nitrate disappearance and N 2 O evolution during denitrification[J] . S. Ellis,L. Dendooven,K.W.T. Goulding.Soil Biology and Biochemistry . 1996 (4)

← 1 →