摘要
研究稻田CO2、CH4、N2O等温室气体的综合增温潜势,有助于科学评价复合稻田生态系统在减少温室气体排放和减缓全球变暖方面的作用,为稻鸭、稻鱼复合种养模式的发展提供依据。2006年采用静态箱法研究了养鸭稻田(RD)、养鱼稻田(RF)和常规淹水稻田(CK)的CH4、N2O的排放量。水稻整个生育期间,RD、CK和RF的CH4排放量分别是19.11、26.71g/m2和25.01g/m2;N2O排放量分别是0.237、0.229、0.237g/m2。采用干物质积累法测得,水稻整个生长期内RD处理地上稻株对CO2的净固定量为2766.4g/m2,RF为2759.59g/m2,CK为2533.9g/m2。采用土壤有机碳库的变化估算土壤CO2净交换通量,水稻整个生育期间,三类稻田土壤亚系统均表现为对CO2的净固定,相当于固定CO2量分别为RD675.55g/m2、CK575.43g/m2、RF562.62g/m2。三类稻田温室气体的交换均表现为CO2的净吸收、CH4、N2O的净排放,综合增温潜势以RD为最低。稻田养鸭能显著减少甲烷排放,降低增温潜势,其减缓综合温室效应的潜力是常规淹水稻田的1.6倍左右。
Research on comprehensive global warming potentials （GWPs）of CO2, CH4, N2O helps evaluating reasonably contribution of integrated paddy ecosystem to mitigating greenhouse gases emission and provides some evidence to develop integrated rice-duck and rice-fish production. By adopting the closed chamber technique,emissions of CH4 and N2O were measured from paddy field of integrated rice-duck eco-system（RD） , integrated rice-fish eco-system（RF） and conventional flooded paddy eco-system（CK）. During the whole rice growing stages,emission of CH4＆ N2O came up to 19.11 g/m^2 ＆ 0. 237 g/m2for rice-duck field; 26.71 g/m2 ＆ 0. 229 g/m2 for conventional paddy field and 25.01g/m^2＆ 0. 237g/m^2for rice-fish field, respectively. By using dry matter accumulation analysis, net fixation of CO2 by rice plant above ground was 2766.4 g/m^2 of rice-duck field, 2533.9 g/m^2 of conventional paddy field and 2759.59 g/m^2of rice-fish field. By analyzing the change of soil carbon pool, during the whole rice growing stage, paddy soil of every three treatments sequestrated equivalently CO2-C of 675.55 g/m^2by rice-duck field, 575.43g/m^2 by conventional paddy field and 562.62 g/m^2by ricefish field. The result of greenhouse exchange of the three types of the paddy fields were net fixation of CO2 and emission of CH4 N2O. Comprehensive global warming potentials of rice-duck in paddy field was proved to reduce CH4 emission significantly, contrasted to that of conventional paddy field. treatment were the lowest among the three. Feeding ducks thus may decrease global warming potential by 1.6 times
出处
《生态学报》
CAS
CSCD
北大核心
2008年第11期5461-5468,共8页
Acta Ecologica Sinica
基金
国家重大科技专项资助项目(2004BA520A02)~~
关键词
稻田
复合生态系统
CH4
CO2
N2O
综合增温潜势
paddy field
integrated ecosystem
CH4
CO2
N2O
comprehensive global warming potentials
