CAJ | 학술논문

将尖叶杜英（Elaeocarpus apiculatus）、米老排（Mytilaria laosensis）和藜蒴（Castanopsis fissa）幼苗置于开顶气室进行人工臭氧熏气和干旱处理，测定其0，15，30 d 时的净光合速率（Pn）、气孔导度（Gs）、胞间CO2浓度（Ci）、蒸腾速率（Tr），并计算气孔限制值（Ls）。结果显示：（1）臭氧胁迫、干旱胁迫及臭氧和干旱交叉胁迫的影响下，3种幼苗的Pn、Gs和Tr随处理时间的延长均呈下降趋势，Ci 上升或下降后上升，Ls 下降或上升后下降；（2）臭氧胁迫期间，尖叶杜英的Pn 下降由非气孔限制引起，而米老排和藜蒴的Pn 下降由气孔限制转为非气孔限制所致；干旱胁迫期间，尖叶杜英和米老排的Pn下降由气孔限制转为非气孔限制所致，而藜蒴的Pn下降由非气孔限制引起；在臭氧与干旱交叉胁迫下，3种幼苗的Pn下降均由非气孔限制所致；（3）主成分分析表明，幼苗抗干旱胁迫及臭氧与干旱交叉胁迫的能力为米老排＞尖叶杜英＞藜蒴，幼苗抗臭氧胁迫的能力为米老排＞藜蒴＞尖叶杜英。
장첨협두영（Elaeocarpus apiculatus）、미로배（Mytilaria laosensis）화려삭（Castanopsis fissa）유묘치우개정기실진행인공취양훈기화간한처리，측정기0，15，30 d 시적정광합속솔（Pn）、기공도도（Gs）、포간CO2농도（Ci）、증등속솔（Tr），병계산기공한제치（Ls）。결과현시：（1）취양협박、간한협박급취양화간한교차협박적영향하，3충유묘적Pn、Gs화Tr수처리시간적연장균정하강추세，Ci 상승혹하강후상승，Ls 하강혹상승후하강；（2）취양협박기간，첨협두영적Pn 하강유비기공한제인기，이미로배화려삭적Pn 하강유기공한제전위비기공한제소치；간한협박기간，첨협두영화미로배적Pn하강유기공한제전위비기공한제소치，이려삭적Pn하강유비기공한제인기；재취양여간한교차협박하，3충유묘적Pn하강균유비기공한제소치；（3）주성분분석표명，유묘항간한협박급취양여간한교차협박적능력위미로배＞첨협두영＞려삭，유묘항취양협박적능력위미로배＞려삭＞첨협두영。
In this study,Elaeocarpus apiculatus,Mytilaria laosensis,and Castanopsis fissa seedlings were placed in open-top chambers for artificial ozone fumigation and drought treatments.Net photosynthetic rate (Pn ), stomatal conductance (Gs),intercellular CO2 concentration (Ci),and transpiration rate (Tr)were determined 0, 1 5 ,and 30 d after treatment,and the corresponding stomatal limitation (Ls )was calculated.With increasing o-zone,drought,or ozone-drought intercross stress duration,Pn,Gs,and Tr of the three species seedlings tended to decrease,Ci increased or alternatively decreased and then increased,and Ls decreased or alternatively increased and then decreased.Decreases in Pn during the ozone stress period could be attributed to non-stomatal limitations in E.apiculatus,and stomatal and non-stomatal limitations in M.laosensis and C.fissa.Observed decreases in Pn under drought stress were the result of stomatal and non-stomatal limitations in E.apiculatus and M.laosensis,and non-stomatal limitations in C.fissa.During the intercross stress period,decreases in Pn in all three species seed-lings were due to non-stomatal limitations.Based on principal component analysis,the three species seedlings were ordered with respect to drought resistance and intercross stress resistance as M.laosensis >E.apiculatus >C. fissa,whereas their resistance to ozone stress was M.laosensis >C.fissa >E.apiculatus.