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测定了3年生白桦的光合与呼吸作用对温度,湿度以及CO2浓度的响应;还测定了光补偿点,光饱和点和CO2补偿点。结果表明:在目前的空气CO2浓度下,光合和呼吸作用的最适温度分别是24℃和30℃;当相对湿度是80%时,白桦能维持较强的光合作用;呼吸作用与相对湿度无明显的相关性;光补偿点和光饱和点分别是25 molm-2s-1和1375 祄olm-2s-1;CO2补偿点是180 礚u001fL-1;白桦在CO2浓度为2400 礚u001fL-1时仍有吸收潜力。图4参19。
The response of photosynthesis and respiration of 3-year-old Betula platyphylla to temperature, humidity and CO2 concentration was measured. The light compensation point, light saturation point and CO2 compensation point were also measured. The results showed that at the current air CO2 concentration, the optimum temperature for photosynthesis and respiration was 24 ℃ and 30 ℃, respectively. When the relative humidity was 80%, the birch could maintain a strong photosynthesis. The respiration and relative humidity The correlation coefficient between light compensation and light saturation was 25 molm-2s-1 and 1375 祄 olm-2s-1 respectively. The CO2 compensation point was 180 礚 u001fL-1. When the CO2 concentration was 2400 礚 u001fL-1 Still have absorption potential. Figure 4 参 参.