不同天气条件下玉米生长期茎流变化特性及研究

he objective of this paper is to offer some theoretics for water-saving irrigation and scientific management of the corn in Arid and Semi-Arid regions through studying on the characteristics of sap flow during corn growing season in different weather conditions.In this research, the sap flow rate of corn and the ambient environmental factors were observed by the packaged sap flow probe and minitype auto-meteorological station.According to the experimental records,three most representative weather conditions were gathered to analyze the changing trends of the corn sap flow and the relationship between corn sap flow and the environmental factors.As a whole, the results showed that the diurnal variation of corn sap flow presents same changing trends(a curve with more than one peak) in different weather conditions.However,they have their own characteristics.The changing trends is the result of comprehensive effects of environmental factors.There is a significant linear relationship between corn sap flow and environmental factors.The main environmental factors which impacts sap flow are different in various weather conditions.It is also found that PAR Light was the dominant factor affecting the sap flow under all the three weather conditions. The water consumption of corn sap flow declined in the order of sunny days>cloudy days>rainy days.