Abstract
Representing an important greenhouse gas, nitrous oxide (N2O) emission from cultivated land is a hot topic in current climate change research. This study examined the influences of nitrogen fertilisation, temperature and soil moisture on the ammonia monooxygenase subunit A (amoA) gene copy numbers and N2O emission characteristics. The experimental observation of N2O fluxes was based on the static chamber-gas chromatographic method. The ammonia-oxidising bacteria (AOB) and ammonia-oxidising archaea (AOA) gene copy numbers in different periods were measured by real-time polymerase chain reaction (PCR). The results indicated that rain-fed potato field was a N2O source, and the average annual N2O emission was approximately 0.46 ± 0.06 kgN2O-N/ha/year. N2O emissions increased significantly with increase in fertilisation, temperatures below 19.6 °C and soil volumetric water content under 15%. Crop rotation appreciably decreases N2O emissions by 34.4 to 52.4% compared to continuous cropping in rain-fed potato fields. The significant correlation between N2O fluxes and AOB copy numbers implied that N2O emissions were primarily controlled by AOB in rain-fed potato fields. The research has important theoretical and practical value for understanding N2O emissions from rain-fed dry farmland fields.
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Acknowledgements
This research was funded by the National Non-profit Research Foundation for Agriculture (201103039), the National Natural Science Foundation of China (Grant Nos. 41371232 and 41271110), the National Basic Research Program of China (No. 2012CB956204) and the National Science and Technology Support Program of China (No. 2012BAD09B02). The authors would like to extend their thanks and appreciation to the staff at the Key Ecological and Environmental Scientific Experiment and Field Observation Station of the Chinese Ministry of Agriculture for assisting in all experiments.
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Wang, L., Wang, C., Pan, Z. et al. N2O emission characteristics and its affecting factors in rain-fed potato fields in Wuchuan County, China. Int J Biometeorol 61, 911–919 (2017). https://doi.org/10.1007/s00484-016-1271-3
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DOI: https://doi.org/10.1007/s00484-016-1271-3