CAJ | 학술논문

在野外自然条件下采用开顶式生长室(OTC)模拟增温的方法,研究了增温对川西北高寒草甸两种典型植物--单子叶草本植物发草(Deschampsia caespitosa)和双子叶草本植物遏蓝荣(Thlaspi arvense)生长和光合特征的影响.结果表明,增温有利于发草地上生物量的增加,其光响应曲线明显高于对照处理,净光合速率(P_n)、蒸腾速率(T_r)、气孔导度(C_s)、最大净光合速率(P_(max))、暗呼吸速率(R_d)、表观量子效率(AQY)和光饱和点(LSP)显著高于对照处理,而光补偿点(LCP)却显著低于对照处理,并且最大光能转化效率(F_v/F_m)、光合量子产量(Yield)、光化学猝灭系数(q_p)和非光化学猝灭系数(q_N)与对照处理相比,都显著增加;增温后遏蓝菜的单株生物量积累显著下降,其光响应曲线也明显低于对照处理,P_n、T_r、C_s、P_(max)、R_d、AQY和LSP显著低于对照处理,F_v/F_m、Yield和q_p在增温后显著减少,而q_N却显著增加.图5表3参25
재야외자연조건하채용개정식생장실(OTC)모의증온적방법,연구료증온대천서북고한초전량충전형식물--단자협초본식물발초(Deschampsia caespitosa)화쌍자협초본식물알람영(Thlaspi arvense)생장화광합특정적영향.결과표명,증온유리우발초지상생물량적증가,기광향응곡선명현고우대조처리,정광합속솔(P_n)、증등속솔(T_r)、기공도도(C_s)、최대정광합속솔(P_(max))、암호흡속솔(R_d)、표관양자효솔(AQY)화광포화점(LSP)현저고우대조처리,이광보상점(LCP)각현저저우대조처리,병차최대광능전화효솔(F_v/F_m)、광합양자산량(Yield)、광화학졸멸계수(q_p)화비광화학졸멸계수(q_N)여대조처리상비,도현저증가;증온후알람채적단주생물량적루현저하강,기광향응곡선야명현저우대조처리,P_n、T_r、C_s、P_(max)、R_d、AQY화LSP현저저우대조처리,F_v/F_m、Yield화q_p재증온후현저감소,이q_N각현저증가.도5표3삼25
Open-top chamber (OTC) was adopted to simulate temperature enhancement in the field, and this study focused on the effect of temperature enhancement on the growth and photosynthetic characteristics of two alpine plants Deschampsia caespitosa (gramineous grass) and Thlaspi arvense (forb) in northwestern Sichuan, China. The temperature enhancement evidently increased the aboveground biomass of D. caespitosa compared to the control plot, and the net photosynthesis rate (P_n), transpiration rate (T_r), stomatal conductance (C_s), maximum net photosynthesis rate (P_(max) ), dark respiration rate (R_d), apparent quantum yield (AQY), and light saturation point (LSP) of D. caespitosa were obviously higher than those of the control plot. However, the photosynthetic light compensation (LCP) of D. caespitosa in OTC was significantly decreased. The chlorophyll fluorescence kinetic parameters such as F_v/F_m, yield, q_p and q_N were markedly increased compared to the control. However, warming treatment significantly decreased the individual aboveground biomass accumulation of T. arvense, and evidently decreased the light response curves compared to the control plot, and the P_n , T_r, C_s, P_(max) , R_d, AQY and LSP were obviouslylower than those of the control plot. Besides, F_v/F_m, yield, and q_p were markedly decreased after temperature enhancement, butq_N evidently increased. Fig 5, Tab 3, Ref 25