Characteristics of latent heat flux were determined using the data gathered from an open path eddy covariance system and an automatic weather gradient system in Cunninghamia lanceolata plantation in Huitong county, Hunan province. The relationship between the environmental factor and latent heat flux was studied. The results show that: the latent heat flux had distinct diurnal and annual variations. In one day, when the season was spring or summer the latent heat flux fluctuated in zero value at night, increasing from 7:00 and reaching at the peak value at 14:00. When the latent heat flux reached the peak value it reduced, 21:00 reaching the night value. In autumn or winter the latent heat flux increasing from 7-30 and reached at the peak value at 12:00 and 21:00 reached the night value. In one year, the latent heat flux annual variations presented single-peak type, the latent heat flux increased from January, August reached the maximum and began to decline month by month. The latent heat flux was linearly related to the photosynthesis active radiation, was quadratic curves related to temperature, and was power function related to the saturation vapor deficit.%利用开路式涡动相关系统与自动气象梯度观测系统的观测数据,对会同杉木人工林潜热通量特征及其与环境因子的关系进行了研究.结果表明:潜热通量具有明显的日变化和年变化特征,一天中,春夏季节潜热通量值夜间在0值左右波动,早上7:00开始递增,14:00左右达到最大后逐渐下降,21:00将为夜间值.秋冬季节潜热通量早上7:30开始递增,12:00达到最大值,19:00降为夜间值.一年中,潜热通量变化特征呈单峰型,从1月份开始递增,8月份达到最大值后逐月递减.潜热通量与光合有效辐射数据之间呈线性相关关系,与温度呈二次曲线关系,与饱和差呈幂函数关系.
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