气候因子对油松林蒸发散的影响

Effect of Climatic Factors on Evapotranspiration of Pinus tabulaeformis Community

测定和分析了2006年4至10月秦岭火地塘林区油松林气候因子和净辐射的变化,采用波文比能量平衡法计算出潜热通量值,同时将潜热通量分为蒸腾通量和蒸发通量。在以上研究的基础上,利用汽化潜热进一步计算出秦岭火地塘林区油松林林地的蒸发量和油松林群落的蒸腾量,并对其与各气候因子的关系进行了主成份分析。

Daily values of net radiation and climatic factors of Pinus tabulaeformis community in Huoditang of Qinling Mountains of year 2006（April-- October）were measured and analyzed. The value of latent heat flux could be calculated by using Bowen--Ratio energy balance method. At the same time, the latent heat flux could be divided into transpiration heat flux and evaporation heat flux. Based on these research results, the evaporation of forestry soil and the transpiration of Pinus tabulaeformis community could be calculated by using latent heat of evaporation （L）. The relationship between the evapotranspiration and climatic factors were analyzed by using principal component analysis method.