【摘要】 用CIRAS-1型光合作用测定系统对毛乌素沙漠边缘地带野生牛心朴子 Cynanchumkomarovii 和甘草 Glycyrrhizauralensis 的不同时期的光合、蒸腾特征进行动态研究.结果表明:牛心朴子和甘草的光合、蒸腾日变化在土壤水分适宜的时期为双峰曲线,在高光照低土壤水分的情况下为单峰曲线,且土壤水分含量越低,午后光合速率下降越快.在不同时期,牛心朴子和甘草都能保持较稳定的水分利用效率,说明其光合、蒸腾对环境具有较强的适应性.更多还原

【Abstract】 The portable photosynthesis system of CIRAS1 was used for the dynamic research of photosynthesis and transpiration of Cynanchum komarovii and Glycyrrhiza uralensis in Maowusu sand.The result indicated that the diurnal changes of photosynthetic rate (Pn) and transpiration rate (Tr) of Cynanchum komarovii and Glycyrrhiza uralensis displayed twopeak pattern when soil water content was suitable.Otherwise it displayed onepeak pattern.In different stage the water use efficiency of Cynanchum komarovii and Glycyrrhiza uralensis kept stability,which showed high adaptability to environment.更多还原