The net photosythetical rate, respiration rate, light compensation point and light saturation point of Larix olgensis and Fraxinus manshurica were measured by Model-865 Co2Infrared Analyzer under controlled conditions (in coviron phytotron). For net photosythetical rate of Larix ogensis and Fraxinus manshurica, the optimum air temperature was 25, 28℃ respectively, the optimum soil water potantial was-20, -10 kPa repectively, the optimum soil water content was 20.31%, 23.42% respectively, and the 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 μmol/m2s respectively and light saturation was 804, 880μmol/m2s.
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