Peatland ecosystems play an important role in the global carbon cycle because they act as a pool or sink for the carbon cycle. However, the relationship between seasonality effect factors and net ecosystem CO<sub&g...Peatland ecosystems play an important role in the global carbon cycle because they act as a pool or sink for the carbon cycle. However, the relationship between seasonality effect factors and net ecosystem CO<sub>2</sub> exchange (NEE) remains to be clarified, particularly for the non-growing season. Here, based on the eddy covariance technique, NEE in the peatland ecosystem of Central China was examined to measure two years’ (2016 and 2017) accumulation of carbon dioxide emissions with contrasting seasonal distribution of environmental factors. Our results demonstrate the cumulative net ecosystem CO<sub>2</sub> emissions during the study period was in the first non-growing season 2.94 ± 4.83 μmolCO<sub>2</sub> m<sup><span style="color:#4F4F4F;font-family:" font-size:14px;white-space:normal;background-color:#ffffff;"="">-</span>2<span style="white-space:nowrap;">.</span></sup>s<sup><span style="color:#4F4F4F;font-family:" font-size:14px;white-space:normal;background-color:#ffffff;"="">-</span>1</sup> with the lowest values in the same year in first growing season was <span style="color:#4F4F4F;font-family:" font-size:14px;white-space:normal;background-color:#ffffff;"="">-</span>2.79 ± 4.92 μmolCO<sub>2</sub> m<sup><span style="color:#4F4F4F;font-family:" font-size:14px;white-space:normal;background-color:#ffffff;"="">-</span>2</sup><span style="font-family:" font-size:13.3333px;white-space:normal;"=""><span style="white-space:nowrap;"><sup>.</sup></span></span>s<sup><span style="color:#4F4F4F;font-family:" font-size:14px;white-space:normal;background-color:#ffffff;"="">-</span>1</sup>. The results indicate the effect of seasonal variations of NEE can be directly reflected in daily and seasonal variations in growth and respiration of peatland ecosystem by environmental parameters over different growing stages.展开更多
文摘Peatland ecosystems play an important role in the global carbon cycle because they act as a pool or sink for the carbon cycle. However, the relationship between seasonality effect factors and net ecosystem CO<sub>2</sub> exchange (NEE) remains to be clarified, particularly for the non-growing season. Here, based on the eddy covariance technique, NEE in the peatland ecosystem of Central China was examined to measure two years’ (2016 and 2017) accumulation of carbon dioxide emissions with contrasting seasonal distribution of environmental factors. Our results demonstrate the cumulative net ecosystem CO<sub>2</sub> emissions during the study period was in the first non-growing season 2.94 ± 4.83 μmolCO<sub>2</sub> m<sup><span style="color:#4F4F4F;font-family:" font-size:14px;white-space:normal;background-color:#ffffff;"="">-</span>2<span style="white-space:nowrap;">.</span></sup>s<sup><span style="color:#4F4F4F;font-family:" font-size:14px;white-space:normal;background-color:#ffffff;"="">-</span>1</sup> with the lowest values in the same year in first growing season was <span style="color:#4F4F4F;font-family:" font-size:14px;white-space:normal;background-color:#ffffff;"="">-</span>2.79 ± 4.92 μmolCO<sub>2</sub> m<sup><span style="color:#4F4F4F;font-family:" font-size:14px;white-space:normal;background-color:#ffffff;"="">-</span>2</sup><span style="font-family:" font-size:13.3333px;white-space:normal;"=""><span style="white-space:nowrap;"><sup>.</sup></span></span>s<sup><span style="color:#4F4F4F;font-family:" font-size:14px;white-space:normal;background-color:#ffffff;"="">-</span>1</sup>. The results indicate the effect of seasonal variations of NEE can be directly reflected in daily and seasonal variations in growth and respiration of peatland ecosystem by environmental parameters over different growing stages.