The Relationship between Transpiration Regularity of Psammophytes in Growth Season and Environmental Factors in Maowusu Sandy Land

The transpiration rates of Caragana intermedia and Artemisia ordosica grown on Sandy Land Xerophyte Botanical Garden in Yanchi County of Ningxia,as well as the change regularity of environmental factors, were measured.The results showed the diurnal transpiration rate of C.intermedia followed a single apex curve,while that of A.ordosica followed a double apices curve.Both plants possessed the physiological characteristics adapted to the arid zone.But their approaches to resist the aridity were different.A.ordosica had higher transpiration rate.The air temperature affected the transpiration rates of the two plant species.The water content of soil mainly affected the transpiration rate of A.ordosica.