|
| Carbon and nitrogen footprints of rice-crayfish coculture: a case study of Huainan City, China |
| Received:May 06, 2024 |
| View Full Text View/Add Comment Download reader |
| KeyWord:carbon footprint;nitrogen footprint;life cycle;rice-crayfish coculture;scenario analysis |
| Author Name | Affiliation | E-mail | | MEI Wei | School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China | | | WU Huijun | School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China | hjwu@aust.edu.cn | | FANG Weixin | School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China | | | ZHU Huimin | School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China | |
|
| Hits: 476 |
| Download times: 473 |
| Abstract: |
| To investigate the primary influencing factors of the carbon and nitrogen footprints in the rice-crayfish coculture and its potential for optimization, based on data from field investigation, literature, and life cycle databases, we used the carbon and nitrogen footprint theories to analyze the carbon and nitrogen footprints of the rice-crayfish coculture from a life-cycle perspective. We also conducted the scenario analysis with the results. The results showed that the carbon footprint per unit area, the carbon footprint per unit production value, and the carbon footprint per unit profit of the rice-crayfish coculture were 16 137.92 kg CO2e·hm-2, 0.19 kg CO2e·yuan-1, and 0.48 kg CO2e·yuan-1, respectively. CH4 emissions（50.5%）and irrigation electricity（17.7%）were the most important contributors to the carbon footprint. The nitrogen footprint per unit area, the nitrogen footprint per unit production value, and the carbon footprint per unit profit of the rice-crayfish coculture were 104.85 kg Nr · hm-2, 1.24×10-3 kg Nr · yuan-1, and 3.15×10-3 kg Nr · yuan-1, respectively. NH3 emission （45.5%）, nitrogen leaching（22.2%）, and runoff（12.6%）were the main contributors to the nitrogen footprint. Combined with the analysis results of carbon and nitrogen footprints, the scenario analysis showed that in the future, integrated use of non-returned straw, photovoltaic power generation and no-tillage technology, as well as rice transplanter-integrated lateral deep fertilization technology could effectively reduce CH4 emissions, improve the utilization rate of clean energy and reduce nitrogen input, thereby reducing the carbon footprint per unit area, carbon footprint per unit production value and carbon footprint per unit profit by 27.5%, 30.4% and 38.5%, respectively. They could also reduce the nitrogen footprint per unit area, nitrogen footprint per unit production value and nitrogen footprint per unit profit by 25.8%, 28.7% and 37%, respectively. Therefore, the integrated application of non-returned straw, photovoltaic power generation and no-tillage technology, as well as rice transplanter-integrated lateral deep fertilization technology can effectively reduce the carbon and nitrogen footprints of the rice-crayfish coculture. |
|
|
|
