|
| CH4 and N2O emissions from freshwater aquaculture |
| Received:December 17, 2019 |
| View Full Text View/Add Comment Download reader |
| KeyWord:freshwater aquaculture;greenhouse gases;emission factor;land use type |
| Author Name | Affiliation | | DING Wei-xin | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | YUAN Jun-ji | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | LIU De-yan | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | CHEN Zeng-ming | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China |
|
| Hits: 2322 |
| Download times: 2965 |
| Abstract: |
| The global fish production in 2016 has reached 171 million tons, which contributed 17% of the global consumption of animal protein. Freshwater aquaculture is an important contributor of fish, and is also a key source of atmospheric CH4 and N2O. In this paper, the fluxes of CH4 and N2O in the different type of freshwater aquaculture were summarized. The conversion of paddy field to extensively managed freshwater aquaculture(pond)increased CH4 emissions, and in contrast, conversion of paddy field to intensively managed aquaculture reduced CH4 emissions. Rice-fish paddy field is found to be a hotspot of atmospheric CH4 and N2O, with the highest emission factors of CH4 and N2O in freshwater aquaculture system. It is necessary to develop necessary field management practices such as decreasing water layer depth to reduce greenhouse gas emissions from paddy fields. Although N2O emission factor of the applied N in the intensively managed freshwater aquaculture was high, however CH4 emission factor was close to zero, resulting in the low global warming potential. Thus, the intensively managed freshwater aquaculture is the direction of freshwater aquaculture development. The global budget of CH 4 and N2O emissions in freshwater aquaculture system was 6.04 Tg and 36.7 Gg, respectively, of which China was the larger contribution country. Thus, it is urgent for China to improve the equipment level and intensively management level in freshwater aquaculture in order to improve feed conversion coefficient and reduce the potential pollution on neighboring water body. |
|
|
|
