Methane and nitrous oxide emissions in rice-crab culture systems of northeast China  

作　　者：Ang Wang Xuzhou Ma Jing Xu Weiqun Lu 

机构地区：[1]National Demonstration Center for Experimental Fisheries Science Education,Shanghai Ocean University,999 Huchenghuan Road,Shanghai,201306,China [2]Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources,Ministry of Education,Shanghai Ocean University,999 Huchenghuan Road,Shanghai,201306,China [3]Key Laboratory of Freshwater Aquatic Genetic Resources,Ministry of Agriculture,Shanghai Ocean University,999 Huchenghuan Road,Shanghai,201306,China [4]Shanghai Engineering Research Center of Aquaculture,Shanghai Ocean University,999 Huchenghuan Road,Shanghai,201306,China [5]Shanghai Collaborative Innovation for Aquatic Animal Genetics and Breeding,Shanghai Ocean University,999 Huchenghuan Road,Shanghai,201306,China [6]Panshan County Meteorological Bureau,Hongqi Road,Liaoning,124000,China

出　　处：《Aquaculture and Fisheries》2019年第4期134-141,共8页渔业学报（英文）

基　　金：This work was supported by Agriculture Research System of Shanghai,China(Grant No.201804);Shanghai Leading Academic Discipline Project(No.Y1101);the AqASEM project(245020)under FP7;The study was also supported by Shanghai Universities First-class Disciplines Project of Shanghai Collaborative Innovation for Aquatic Animal Genetics and Breeding(No.ZF1206)。

摘　　要：Rice-crab integrated ecosystem has been confirmed to improve the ecological environment and brought greater economic benefits.In order to know greenhouse gases methane(CH_(4))and nitrous oxide(N_(2)O)emissions in ricecrab system,they were quantified from a flooding rice field in northeast China,as affected by integrated ricecrab cultivation.Three treatments with three replications each were given:(1)RC1-rice with crab(megalopa),(2)RC2-rice with crab(juvenile),(3)RM-rice only.Seasonal CH_(4) and N_(2)O fluxes were measured by closed chamber method.Compared with RM treatment,RC1 and RC2 treatments greatly enhanced the cumulative seasonal CH_(4) emissions(by 36.8%and 29.2%,respectively),and reduced the cumulative seasonal N_(2)O emissions(by 28.2%and 19.7%,respectively).Across treatments,CH_(4) represented over 97%of total global warming potential(GWP)and as a result,RC1 and RC2 treatments significantly increased the GWP than RM treatment.Although the GWP was highest in RC1 treatment,it provided highest rice yield(8780 kg/ha)and net ecosystem economic budget(NEEB,23,159 Yuan/ha)over RM(7668 kg/ha,15,130 Yuan/ha)and RC2(8042 kg/ha,18,713 Yuan/ha)treatments.To summarize,cultivation of megalopa in rice field is a better strategy to optimize the economic and environmental benefits in northeast China.

关 键 词：Rice-crab integrated ecosystem METHANE Nitrous oxide Rice yield Global warming potentials Net ecosystem economic budget 

分 类 号：S51[农业科学—作物学]