Through analyzing the various position leaves character of 3 ages bamboo, including net photosynthetic rate, light respiratory rate, dark respiratory rate, CO 2 compensation point and light compensation point, in five...Through analyzing the various position leaves character of 3 ages bamboo, including net photosynthetic rate, light respiratory rate, dark respiratory rate, CO 2 compensation point and light compensation point, in five-years-old forest during different growing shoot stages in stated-own forestry farm of Nanjin, results showed that leaves had vigorous physiological function during prosperity stage of growing shoot. Net photosynthetic rate was higher, light respiratory rate, dark respiratory rate, CO 2 compensation point and light compensation point were lower, the photosynthetic coefficients was larger.2-year bamboo and 3-year bamboo had stronger photosynthetic ability.Different photosynthetic and respiratory indexes of various position leaves were not consistent, but in generally, middle leaf had stronger assimilation ability.展开更多
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 po...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.展开更多
文摘Through analyzing the various position leaves character of 3 ages bamboo, including net photosynthetic rate, light respiratory rate, dark respiratory rate, CO 2 compensation point and light compensation point, in five-years-old forest during different growing shoot stages in stated-own forestry farm of Nanjin, results showed that leaves had vigorous physiological function during prosperity stage of growing shoot. Net photosynthetic rate was higher, light respiratory rate, dark respiratory rate, CO 2 compensation point and light compensation point were lower, the photosynthetic coefficients was larger.2-year bamboo and 3-year bamboo had stronger photosynthetic ability.Different photosynthetic and respiratory indexes of various position leaves were not consistent, but in generally, middle leaf had stronger assimilation ability.
基金This paper was supported by the National Natural Science Foundation of China (No. 39970627) and the Key Project of State Department of Science Technology (2002BA515B05).
文摘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.
