Abstract: In order to characterize the water consumption by Caragana intermedia, an excellent windbreaking and sandfixing shrub species widely planted in Inner Mongolia, its wholeplant transpiration was monthly measured by using Granier’s thermal dissipation probe. Meanwhile, the environmental factors such as solar radiation around sample plant, air temperature, air relative humidity, and soil temperature were also measured. The wholeplant transpiration had a diurnal variation with four distinct phases, i.e., rapid ascending phase, stationary high phase, rapid descending phase, and stationary low phase. Except for October, in which the trunk sap flow had a marked decrease, there was no significant difference in the sap flow in other months. In May, July, and September, the variation of trunk sap flow lagged behind solar radiation, but advanced vapor pressure deficit. Solar radiation was the key factor affecting the transpiration. Under sudden precipitation, a rapid increase of the wholeplant sap flux was observed, but the increase lagged behind the peak time of the precipitation.

Key words: Imidacloprid, Triazophos, Pyridaben, Byachydanio rerio, Acute toxicity, Bio-concentration