STUDY ON PHYSIOLOGICAL CHARACTERISTICS OF LARIX OLGENSIS AND FRAXINUS MANSHURICA UNDER CONTROLLED CONDITIONS

摘要

The net photosythetical rate, respiration rate, light compensation point and light saturation point of Larix olgensis and Fraxinus manskimca were measured by Model-865 Co~2 Infrared Analyzer under controlled conditions (in coviron phytolron). For netphotosythetical rate of Larix ogensis and Fraxinus manshurica , the optimum air temperature was 25, 28 deg C respectively, the optimum soil water potantial was -20, -10 kPa repectively, the optimum soil water content was 20.31%, 23,42% respectively, andthe optimum air humidity was 90%. The optimum soil water potantial of respiration rate was -30 kPa. The light compensation point for the two species was 3,36, 4.8 mu mol/m~2s respectively and light saturation was 804, 880 mu mol/ m~2s.