晋西南黄土区刺槐油松林地耗水规律的研究

The Regularity of Water Consumption of Black Locust and Chinese Pine on Loess Slope in Southwestern of Shanxi Province

该文应用水量平衡法和波文比－能量平衡法，研究得出刺槐和油松林土面蒸发、蒸腾、林冠截留蒸发的季节变化规律，耗水各分量的比例关系．耗水各分量占总耗水量的比例：林木蒸腾量为５７．７％～６０．２％，林地土面蒸发量为１３．２％～２２．８％，林冠截留量为１７．０％～２８．２％．其中６，７，８三月的蒸腾耗水量占全年的８０％．不同林分生长季耗水量有差异，其规律为：其它条件相同时，丰水年，阴坡耗水大于阳坡；少水年，阴坡耗水稍大于阳坡；密度大的林分耗水量也大．

Bowen ratio energy balance methods and water balance methods,the study obtains the regularity of water consumption of black locust and Chinese pine.The percentages of crown evaporation,soil evaporation and transpiration to total water consumption in foersts,respectively,170～28.2%,13.2～22.8%, 57.7～60. 2%.Transpiration to the total water consumption is 80% in summer (June,July,Augest).Water consumption is different in different stands.The regularity is that water consumption amount of northward slopes is more than that in southward slopes.Water consumption in highdensity stands is higher than that in lowdensity stands in case the other conditions are the same.