摘要
通过对黑土稻田CH4和N2 O排放的观测 ,发现水稻生长季CH4和N2 O排放量低于全国其它地区稻田 .CH4和N2 O排放之间存在互为消长关系 (r =- 0 .5 13,P <0 .0 5 ) .但在同样施肥水平条件下 ,间歇灌溉与长期淹灌相比 ,CH4排放明显减少而N2 O略有增加 ,其相对综合温室效应被大大减少且水稻产量未受影响 .为此 ,间歇灌溉可作为减少稻田温室气体排放的水分管理措施 .另外 ,通过对CH4和N2 O排放的相关微生物过程探讨 ,揭示产甲烷菌数与CH4排放间呈显著性正相关 (R2 =0 .82 ,P <0 .0 5 ) ,硝化菌数和反硝化菌数与N2
Determinations on the CH 4 and N 2O emissions from phaeozem rice field showed that their emission amount in rice growing season was much lower than any other regions in China.There was trade-off relationship between CH 4 and N 2O emissions(r=-0.513,P<0.05). Under the same fertilization,compared with continual irrigation, intermittent irrigation could reduce significantly CH 4 emission and increase N 2O emission ,but the overall warming potential of greenhouse effect was reduced greatly,while rice yield was not affected.Therefore,intermittent irrigation was an effective irrigation measures to reduce greenhouse gas emissions from rice field. In addition,investigations on CH 4 and N 2O emissions and their related microbial process showed a positive relation between methanogens number and CH 4 emission(R 2=0.82,P<0.05),and the important relationship between the numbers of nitrifiers and denitrifiers and N 2O emissions.
出处
《应用生态学报》
CAS
CSCD
2003年第11期2015-2018,共4页
Chinese Journal of Applied Ecology
基金
国家重点基础研究发展规划项目(G19990 1805)
中国科学院资源环境领域知识创新工程资助项目(KZCX2 40 8)
