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Nitrogen (N) fertilization has a considerable effect on food production and carbon cycling in agro-ecosystems. However, the impacts of N fertilization rates on the temperature sensitivity of soil respiration ( Q  10 ) were controversial. Five N rates (N0, N45, N90, N135, and N180) were applied to a continuous winter wheat ( Triticum aestivum  L.) crop on the semi-arid Loess Plateau, and the  in situ  soil respiration was monitored during five consecutive years from 2008 to 2013. During the growing season, the mean soil respiration rates increased with increasing N fertilization rates, peaking at 1.53 μmol m −2 s −1  in the N135 treatment. A similar dynamic pattern was observed during the non-growing season, yet on average with 7.3% greater soil respiration rates than the growing season. In general for all the N fertilization treatments, the mean  Q  10  value during the non-growing season was significantly greater than that during the growing season. As N fertilization rates increased, the  Q  10  values did not change significantly in the growing season but significantly decreased in the non-growing season. Overall, N fertilization markedly influenced soil respirations and  Q  10  values, in particular posing distinct effects on the  Q  10  values between the growing and non-growing seasons.

Temperature Sensitivity of Soil Respiration to Nitrogen Fertilization: Varying Effects between Growing and Non-Growing Seasons