油松人工林枝叶容水量与蒸发速率的研究

STUDY ON WATER HOLDING CAPACITY OF BRANCHES AND NEEDLES AND THEIR EVAPORATION RATE IN PLATATION OF CHINESE PINE

通过研究油松树枝叶容水量与蒸发速率的结果表明,油松(Pinus tabulaeformis)树枝叶容水量与树枝叶重量呈直线正比关系(C=16.434+0.226W);前3min的平均蒸发速率为0.0237g/g·min;水湿树枝叶在停止降水后即开始蒸发变干,其变干历时与该时段的平均相对湿度呈递增指数函数关系(t_1=11.53 e^(0.028(?))),与平均气温呈递减指数函数关系(t_2=3 256.07.e^(-144c))。油松针叶的蒸发速率为0.013 7g/g·min,为蒸腾强度的3.43倍。其日变化规律和季节变化规律均与蒸腾强度相似。

This paper has studied the water holding capacity of branches and needles of P. tabulaeformis plantation and its evaporation rate. The results of the study showed that the water holding capacity standed in a linear relation with the weight of branches and needles(C=16.434+0.226w); the evaporation rate in the first 3 min averaged 0.0237g/g·min; the evaporation from wet branches and needles began as only after rain stoping, and the drying period of time for branches and needles standed in a relaiton of increasing indicial function with average relative humidity in that period of time(t_1=11.53^(0.02866rh), also as well in a relation of decreasing index function with average air temperature(t_2=3256.07e^(-0.14)). The evaporation rate of needles of P. tabulaefurmis averaged 0.0137g/g·min, or the 3.43 times of transpiration intensity, and its daily and seasonal variation patterns were simliar to that of evaporation intensity.