A study on photosynthetic characteristics ofBetula platyphylla

Abstract

Influences of temperature, humidity, and CO₂ concentration on the photosynthesis and respiration of three-year-oldBetula platyphylla was investigated. Light compensation point, saturation point and CO₂ compensation point were also determined. The results showed that the optimal temperature of photosynthesis and dark respiration was 24 °C and 30 °C, respectively, at ambient CO₂. When relative humidity was 80%,Betula platyphylla could maintain strong photosynthesis. There was no significant correlation between respiration and relative humidity. The light compensation and saturation point was 25 μmol·m⁻²·s⁻¹ and 1 375 μmol·m⁻²·s⁻¹, respectively. The CO₂ compensation point was 180 μL·L⁻¹. The results showed thatBetula platyphylla still had potential to assimilate CO₂ when CO₂ concentration was above 2 400 μL·L⁻¹.

Keywords

Betula platyphylla / Photosynthesis / Respiration / CO₂ concentration / S792.153 / Q954.11 / A