Five Kinds Of Trees Transpiration Rate Research In Qiqihaer Area

In July and August, we recorded the transpiration rates of five trees using the rapid weighting method every ten-day in Lvyuan experimental base, Fulaerji District, Qiqihaer, at the same time we recorded the local synchronization meteorological data. The transpiration rate unit used fresh leaf weight. After analysed, we found that the change of these trees' transpiration rates had the well correlational dependence on the meteorological factors such as solar radiation, the temperature, the air relative humidity, and so on. Transpiration rate was chiefly effected by solar radiation, air temperature and relative humidity. Wind speed also affected the transpiration rate of the five trees species. The overcast weather could reduce the transpiration rate of trees in a short term. At night, although these trees transpiration rate reduced, but water consumption proportion could not to be neglected. These transpiration rates showed different tends at night, through the data contrastive analysis, we found that the trees whose transpiration rates changed fiercely at daytime, their transpiration rates reduceed and then increased at night, others presented the stabler stationary transpiration rates. Compared with the meteorological factors, physiological and ecological characteristics of trees were primary determinants. Flueggea suffruticosa (Pall.) Rehd, Caragana microphylia Lam and Morus alba Linn were similar, during daytime they had intense transpiration activities, and the transpiration rate scope changed obviously. Hippophae rhamnoides Linn transpiration was also active, and more sensitive to drought, while affected by drought stress, it apparentd obvious midday depression by self-regulation. Among the five trees, Querus mongolica Fisch maybe had the best adjustment ability in transpiration activity, it maintained low transpiration rate all along, and had highest capability of control to the moisture content disappearing.While analyzed the transpiration rates of different trees through a single index the unit leaf fresh weight transpiration rate, Morus alba Linn, Caragana microphylia Lam and Flueggea suffruticosa (Pall.) Rehd had strong competitive ability and advantage in short-time growth competition, but they would relatively consume more water. When planting these trees we must consider the balance between density and soil moisture. Hippophae rhamnoides Linn had better regulation, control mechanisms and stronger control ability of water consumption, less affected by environment. The competitiveness of Querus mongolica Fisch might be weaker than others, but its well regulatory mechanism of water would make it,hold water the best, furthermore, it might increased soil moisture. These derived only from a single index the unit leaf fresh weight transpiration rate, in practical applications, we should also combine other factors to analysis.