A COMPARATIVE STUDY ON SUCCULENTXEROPHYTES AND MESOPHYTES FOR THEIR RESPONSE TO DROUGHT STRESS
The water physiological features of Haloxylonammodendron, Calligonum and Populus hosiensis, Elaegnusn Angastifolia under drought stress were comparatively studied. The results indicated that the four kinds of plants all showed water saturated deficiency to different degree and have obvious diurnal changes, in which water saturated deficiency of Populus hosiensis and Elaegnusn Angasti folia fluctuated greatly. Water potential of Haloxylonammodendron was lower than that of other three species, which was helpful to absorb water from soil and to increase anti-drought abilities. The diurnal changes of transpiration rates of Calligonum and Elaegnusn Angastifolia showed two-peaked type and one-peaked type respectively, whereas that of Haloxylonammodendron and Populus hosiensis fluctuated gently. Diurnal fluctuations of transpiration rate of four kind plants were all mainly controlled by environmental factors. Water use efficiency of Calligonum was higher than that of other three species. Although Calligonum can use water more efficiently than Haloxylonammodendron, the latter has higher ability to absorb water and to minimize water loss due to its lower transpiration and lower water potential. Elaegnusn Angastifolia took on comparably high water use efficiency. However, high transpiration and large leaf area made it more suitable for desert habitat with good water condition and be an important species for protection forest.
desert plantsdrought stresstranspiration ratewater use efficiency
国家科技期刊平台
NSTL
万方数据
维普
