CAJ | 학술논문

以桢楠、香樟、红椿3个珍贵树种的1年生苗木为研究对象，测定并分析了其光合生理特性。结果表明，（1）净光合速率（Pn）、水分利用率（WUE）均表现为桢楠＞香樟＞红椿，而气孔导度（Gs）、胞间CO2浓度（ Ci）、蒸腾速率（ Tr）则表现为桢楠＜香樟＜红椿，在影响光合作用的各因素中， Tr在树种间的差异相对显著，表明影响3个树种有效光合物质积累的主要因素为蒸腾作用；（2）3个树种叶片的Pn值表现出了相似的对光照强度（ PAR）与CO2浓度的响应趋势，即在低光照强度或CO2浓度下， Pn值随着PAR或CO2浓度的增加而迅速增加，而在高光照强度或CO2浓度下， Pn值增加的趋势变缓，其中香樟叶片光补偿点（ Lcp ）及光饱和点（Lsp）分别为67.50μmol/（m2· s）与473.10μmol/（m2· s），其 CO2补偿点（Ccp）和饱和点（Csp）为111.30μmol/（ m2· s）与1681.00μmol/（ m2· s），均较红椿和桢楠高，其最大净光合速率（ Pmax ）也高于红椿和桢楠；（3）3个树种的Pn、 Tr、 Ci、 Gs和WUE参数日变化趋势基本一致，而且均表现出明显的“午休”现象，其中， Pn参数日变化呈双峰型曲线，峰值出现在10：00和16：00，且午前明显高于午后。
이정남、향장、홍춘3개진귀수충적1년생묘목위연구대상，측정병분석료기광합생리특성。결과표명，（1）정광합속솔（Pn）、수분이용솔（WUE）균표현위정남＞향장＞홍춘，이기공도도（Gs）、포간CO2농도（ Ci）、증등속솔（ Tr）칙표현위정남＜향장＜홍춘，재영향광합작용적각인소중， Tr재수충간적차이상대현저，표명영향3개수충유효광합물질적루적주요인소위증등작용；（2）3개수충협편적Pn치표현출료상사적대광조강도（ PAR）여CO2농도적향응추세，즉재저광조강도혹CO2농도하， Pn치수착PAR혹CO2농도적증가이신속증가，이재고광조강도혹CO2농도하， Pn치증가적추세변완，기중향장협편광보상점（ Lcp ）급광포화점（Lsp）분별위67.50μmol/（m2· s）여473.10μmol/（m2· s），기 CO2보상점（Ccp）화포화점（Csp）위111.30μmol/（ m2· s）여1681.00μmol/（ m2· s），균교홍춘화정남고，기최대정광합속솔（ Pmax ）야고우홍춘화정남；（3）3개수충적Pn、 Tr、 Ci、 Gs화WUE삼수일변화추세기본일치，이차균표현출명현적“오휴”현상，기중， Pn삼수일변화정쌍봉형곡선，봉치출현재10：00화16：00，차오전명현고우오후。
The photosynthetic characteristics of one-year-old seedlings of 3 precious timber tree species ( Phoebe zhennana, Cinnamomum camphora and Toona sureni) were studied.The main results are as follows: 1) Among 3 tree species, the values of Pn and WUE were Phoebe zhennana>Cinnamomum camphora>Toona sureni, and for Gs, Ci and Tr, the order was Phoebe zhennana<Cinnamomum camphora<Toona sureni.The values of Tr presen-ted relatively significant difference among tree speices , and this means that the transpiration was the major factor in accumulating photosynthetic materials .2 ) Among 3 tree species , the values of Pn showed a tendency of similarity with responded to PAR and concentration of CO 2 .In lower PAR or concentration of CO 2 , the value of Pn increased sharply , while it increased slowly in higher PAR or concentration of CO 2 .The values of Lcp, Lsp, Ccp and Csp of Cinnamomum camphora were 67.50μmol/m2· s, 473.10μmol/(m2· s), 111.30μmol/(m2· s) and 1 681.00μmol/(m2· s) respectively, and all values were higher than those of Phoebe zhennana and Toona sureni.Pmax of Cinnamomum camphora was also higher than that of Phoebe zhennana and Toona sureni.3) The values of Pn, Tr, Ci, Gs and WUE of 3 tree species showed similar diurnal changes and obvious midday depression .The diurnal change of Pn presented a double-peak type , with the peak value occurred at 10:00 and 16:00 respectively , and the Pn value in the morning was significantly higher than that in the afternoon .