Burning crop residues and excessive use of chemical fertilizers results in an enormous waste of biological resources, which further weakens the potential capacity of the agro-ecosystem as a carbon sink. To explore the potential of farmlands acting as a carbon sink without yield losses, we conducted an experiment on a temperate eco-farm in eastern rural China. Crop residues were applied to cattle feed, and the composted cattle manure was returned to cropland with a winter wheat and maize rotation. Four different proportions of fertilizers were designed: 100 % cattle manure, 100 % mineral nitrogen, 75 % cattle manure plus 25 % mineral nitrogen, and 50 % cattle manure plus 50 % mineral nitrogen. Crop yield and greenhouse gas (GHG) emissions were carefully calculated according to the Intergovernmental Panel on Climate Change (IPCC) Guidelines for National Greenhouse Gas Inventories 2006. Our results showed that replacing chemical fertilizer with organic manure significantly decreased the emission of GHGs. Yields of wheat and corn also increased as the soil fertility was improved by the application of cattle manure. Totally replacing chemical fertilizer with organic manure decreased GHG emissions, which reversed the agriculture ecosystem from a carbon source (+2.7 t CO2-eq. hm−2 year−1) to a carbon sink (−8.8 t CO2-eq. hm−2 year−1). Our findings provide useful insights for improving agricultural ecosystems under global change scenarios.
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This work was jointly supported by the Key Strategic Project of the Chinese Academy of Sciences (KSZD-EW-Z-012-2) and the National Science and Technology Support Program (2012BAD14B00). We acknowledge Dr. Caihong Li and Dr. Yong Li of Institute of Botany, Chinese Academy of Sciences for their advices and help in the statistical analysis. Special thanks go to the staff of the Eco-farm Research Station of Shandong Agricultural University for providing living facilities during the experimental run.
Conflict of interest
The authors declare that they have no conflict of interest.
SPECIAL TOPIC: Land-ocean integrated research and development of carbon sink
Haitao Liu, Jing Li, and Xiao Li contributed equally to this work.
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Liu, H., Li, J., Li, X. et al. Mitigating greenhouse gas emissions through replacement of chemical fertilizer with organic manure in a temperate farmland. Sci. Bull. 60, 598–606 (2015). https://doi.org/10.1007/s11434-014-0679-6
- Crop residue
- Chemical fertilizer
- Cattle manure
- Crop yield
- Greenhouse gas emissions
- Climate change