A study on photosynthetic characteristics of Betula platyphylla  

白桦光合特性的研究(英文)

作　　者：周玉梅[1] 杨传平[2] 王淑娟[3] 吴月亮[4] 王文章[2] 韩士杰[1] 

机构地区：[1]中科院沈阳应用生态所,沈阳110016 [2]东北林业大学,哈尔滨150040 [3]吉林大学生命科学院,长春130000 [4]辽宁省林业科学研究院,沈阳110032

出　　处：《Journal of Forestry Research》2002年第3期209-212,共4页林业研究（英文版）

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).

摘　　要：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.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L-1;白桦在CO2浓度为2400 礚L-1时仍有吸收潜力。图4参19。

关 键 词：Betula platyphylla PHOTOSYNTHESIS RESPIRATION CO2 concentration 

分 类 号：S792.153[农业科学—林木遗传育种]