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Rainfall increasing offsets the negative effects of nighttime warming on GHGs and wheat yield in North China Plain
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Rainfall increasing offsets the negative effects of nighttime warming on GHGs and wheat yield in North China Plain
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Journal Article
Rainfall increasing offsets the negative effects of nighttime warming on GHGs and wheat yield in North China Plain
2021
Overview
The effects of nighttime warming and rainfall increasing on crop productivity and soil greenhouse gas emissions are few studied. This study was conducted with a field experiment to investigate the effects of nighttime warming, rainfall increasing and their interaction on wheat grain yield, methane (CH
4
) and nitrous oxide (N
2
O) emissions during a winter wheat growing season in the North China Plain (NCP). The results showed that nighttime warming and rainfall increasing significantly altered soil temperature and moisture, and thus the CH
4
and N
2
O emissions from the soil. Nighttime warming significantly promoted soil CH
4
uptake by 21.2% and increased soil N
2
O emissions by 22.4%. Rainfall increasing stimulated soil N
2
O emissions by 15.7% but decreased soil CH
4
uptake by 18.6%. Nighttime warming significantly decreased wheat yield by 5.5%, while rainfall increasing enhanced wheat yield by 4.0%. The results indicate that the positive effect of nighttime warming on CH
4
uptake and negative effect on wheat yield can be offset by rainfall increasing in the NCP. Generally, rainfall increasing significantly raised the global warming potential and greenhouse gas intensity induced by CH
4
and N
2
O emissions. Overall, this study improves our understanding of agroecosystem C and N cycling in response to nighttime warming and rainfall increasing under future climate change.
