濒危植物南川升麻光合生理生态的初步研究

 本文研究了南川升麻在林缘、林窗和林下3种生境中的光合特性和光合、呼吸日进程。结果表明，在3种生境下光补偿点无显著差异，在20μmol·m-1·s-2左右，而光饱合点则有较大差异。在3种生境下的光合日变化曲线均为单峰曲线，无“午休”现象，光合峰值是林缘>林窗>林下。影响光合日进程的最主要的生态因子为光合有效辐射强度；光合最适温度较低。呼吸日进程在3种生境下没有显著差异，与温度日变化基本一致。

PRELIMINARY STUDIES ON PHYSIOLOGICAL ECOLOGY OF PHOTOSYNTHESIS OF AN ENDANGERED PLANT CIMICIFUGA NANCHUANENSIS

In this paper,the characteristics and diurnal development of photosynthesis and respiration of cimicifuga nanchuanensis in edge forest,forest gap and down forest were studied.In three habitats,the difference in compensation point of light was not significant,But the light saturation points were very different;The order of photosynthesis peak value was edge forest>forest gap>down forest;The most important ecological factor affecting the photosynthesis was PAR;The optimal temperature for photosynthesis was rather low.The diurnal development of respiration in the three habitats had little difference,correspondent to the diurnal change of air temperature.