Strategic tillage achieves lower carbon footprints with higher carbon accumulation and grain yield in a wheat-maize cropping system.

Autor: Liu QY; College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, PR China; Key Laboratory of Farming System, Ministry of Agriculture and Rural Affairs of China, Beijing 100193, PR China., Xu CT; College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, PR China; Key Laboratory of Farming System, Ministry of Agriculture and Rural Affairs of China, Beijing 100193, PR China., Han SW; College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, PR China; Key Laboratory of Farming System, Ministry of Agriculture and Rural Affairs of China, Beijing 100193, PR China., Li XX; College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, PR China; Key Laboratory of Farming System, Ministry of Agriculture and Rural Affairs of China, Beijing 100193, PR China., Kan ZR; College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, PR China; Key Laboratory of Farming System, Ministry of Agriculture and Rural Affairs of China, Beijing 100193, PR China., Zhao X; College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, PR China; Key Laboratory of Farming System, Ministry of Agriculture and Rural Affairs of China, Beijing 100193, PR China., Zhang HL; College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, PR China; Key Laboratory of Farming System, Ministry of Agriculture and Rural Affairs of China, Beijing 100193, PR China. Electronic address: hailin@cau.edu.cn.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2021 Dec 01; Vol. 798, pp. 149220. Date of Electronic Publication: 2021 Jul 22.
DOI: 10.1016/j.scitotenv.2021.149220
Abstrakt: Continuous single tillage has the potential to increase greenhouse gas (GHG) emissions and decrease the accumulation of soil organic carbon (SOC), thus increasing carbon footprints (CFs). However, in a wheat-maize cropping system, limited information was available about the effects of strategic tillage on CFs. Thus, a four-year field experiment was conducted, including continuous rotary tillage (RT), continuous no-till (NT), RT + subsoiling (RS), and NT + subsoiling (NS), to investigate the effects of NS (strategic tillage) on the unit area and unit yield. The results showed that CO 2 emission was the highest contributor to CFs (73.92%) in a winter wheat-summer maize cropping system, following the order of NS < NT < RS < RT. The direct N 2 O emissions from fertilizers and residues were 4.43-4.51 t CO 2 -eq ha -1 yr -1 during the wheat and maize seasons, and indirect N 2 O emissions from irrigation and fertilizer inputs had a proportion of >80% from total agricultural inputs. The differences in SOC storage significantly affected the CFs. Although the NS treatment increased the amount of GHG emissions from the residues returned and consumption of diesel, the enhancement of SOC storage by deeper SOC increased. Thus, lower area-scaled CFs were observed in the NS treatment. Furthermore, a higher grain yield and an annual change of SOC storage compared with other treatments were observed under the NS system, which helped to reduce the CFs. The yield-scaled CFs followed the order of RT > RS > NT > NS when considering the changes in SOC storage. Therefore, the NS treatment resulted in a higher grain yield and SOC sequestration with lower CFs, and thus, it could be recommended as the best tillage method to achieve sustainable production and environmental balance in a wheat-maize cropping system.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2021 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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