Characteristics of CH4 Flux over Rice-Wheat Rotation Fields in Huaihe River Basin
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Abstract:
Based on the observation data of the open-circuit CH4 gas analyzer at Shouxian National Climatological Observatory, we analyze the variation characteristics and influencing factors of CH4 flux in different growth periods of rice-wheat rotation farmland in the Huaihe River Basin. The results show that CH4 flux in the Huaihe River Basin has a single peak distribution throughout the year, with the peak occurring in summer. The diurnal variation of CH4 flux shows a single peak during the day, and the peaks mostly appear in the afternoon. CH4 flux during the day is higher than at night. CH4 flux in the rice growth period is significantly higher than that in the wheat growth period. During the wheat growth period, CH4 flux is the smallest during the seedling period but the largest during the mature period, reaching 0.14 μg ·m-2·s-1. During the rice growth period, the maximum CH4 flux during the jointing period is 3.02 μg ·m-2·s-1, and the minimum during the maturity stage is 0.12 μg ·m-2·s-1. CH4 flux decreases by 50% and 30% before and after the harvest of rice and wheat. This study shows that crop biomass has a significant impact on CH4 flux. CH4 flux is positively correlated with precipitation, relative humidity, water vapour pressure, soil temperature, and air temperature. When precipitation, humidity, or air temperature is higher, the CH4 flux will be greater.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.