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麻栎光合作用的特性及其对CO_2倍增的响应 被引量:25

A Study on the Photosynthetic Characteristics of Sawtooth Oak and Its Response to Elevated CO_2
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摘要 研究了 1 2年生麻栎的光合作用特性、净光合速率的日变化及其对CO2 倍增的响应。结果表明 :( 1 )麻栎叶片的光饱和点约为 1 2 0 0 μmol/ (m2 ·s) ,光补偿点约为 50 μmol/ (m2 ·s) ,表观光量子效率为 0 .0 2 5mol/mol。麻栎叶片CO2 补偿点为 60 μmol/mol,CO2 饱和点为1 2 0 0 μmol/mol,叶片的羧化效率为 0 .0 2 ,麻栎为喜光的C3植物 ;( 2 )麻栎叶片的净光合速率日变化在生长初期和末期为单峰曲线 ,其走势与光合有效辐射走势一致 ;而在生长盛期为双峰曲线 ,净光合速率在中午出现了明显的下降 ;( 3 )主成份分析表明 ,影响麻栎净光速率的主导因子在生长初期是光强和叶室CO2 浓度 ,在生长盛期是饱和蒸汽压差和温度 ,在生长末期是饱和蒸汽压差和相对湿度 ;( 4 )CO2 倍增条件下 ,麻栎叶片净光合作用速率平均增幅为 89.1 7%。 Sawtooth oak( Quercus acutissima )is one of the most important afforestation tree species.To study its photosynthetic characteristics and its response to elevated CO 2 can provide the foundation for predicting the production of sawtooth oak forest,making its carbon budget and understanding its response to global changes.The experiment was carried out with Licor 6400 portable photosynthesis system.The main results were as follows:(1)The critical points of light compensation and saturation of sawtooth oak were about 50 μmol/(m 2·s) and 1 200 μmol/(m 2·s) respectively,which meant that sawtooth oak was a light demanding plant.Its CO 2 compensation point and saturation point were 60 μmol/mol and 1 200 μmol/mol respectively,which meant that it was of a C 3 type plant.(2)The daily course of net photosynthesis rate( Pn )was single peaked during spring and autumn,however it was double peaked during summer.The daily maximum Pn in spring,summer and autumn was 7.52, 14.03 and 7.43 μmol/(m 2·s) respectively.(3)Principal component analysis showed that the leading factors affecting Pn during spring were photosynthetic active radiation( PAR )and sample CO 2 concentration( Cs ),which during summer were vapour pressure deficit( VPD )and leaf temperature,which during autumn were VPD and humidity.(4)Compared to the average Pn under normal CO 2 concentration,which was 7.55 μmol/(m 2·s),the average Pn of sawtooth oak under doubled CO 2 concentration increased 89.17%,which was 17.03 μmol/(m 2·s).
出处 《南京林业大学学报(自然科学版)》 CAS CSCD 北大核心 2002年第4期67-70,共4页 Journal of Nanjing Forestry University:Natural Sciences Edition
基金 国家自然科学基金资助项目 (39899370 )
关键词 光合作用 麻栎 净光合作用速率 二氧化碳倍增 光合唤应 日变化 Sawtooth oak Net photosynthesis rate Elevated CO 2 concentration
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