岷江上游干旱河谷岷江柏的光合与水分生理特征干湿季对比研究  

Comparative study on photosynthetic physiological and water physiological characteristics of Cupressus chengiana in wet and dry season,the upper Minjiang River dry valley

作　　者：李登峰 魏仕军 陈静 冯秋红[1,2] 徐峥静茹 李旭华 刘千里 蔡蕾 LI Dengfeng;WEI Shijun;CHEN Jing;FENG Qiuhong;XU Zhengjingru;LI Xuhua;LIU Qianli;CAI Lei(Sichuan Academy of Forestry Sciences,Ecological Restoration and Conservation on Forest and Wetland Key Laboratory of Sichuan Province,Chengdu 610081,China;Sichuan Wolong Forest Ecosystem Research Station,Aba 624000,China;Lixian Forestry Bureau of Sichuan Province,Lixian 623100,China;Aba Prefecture Bureau of Forestry and Grassland,Aba 624000,China;Forestry Science and Technology Institute of Aba Tibetan and Qiang Autonomous Prefecture,Wenchuan 623000,China)

机构地区：[1]四川省林业科学研究院,森林和湿地生态恢复与保育四川重点实验室成都610081 [2]四川卧龙森林生态系统国家定位观测研究站,阿坝623006 [3]四川省阿坝州理县林业局,理县623100 [4]阿坝州林业和草原局,阿坝624000 [5]阿坝藏族羌族自治州林业科学技术研究所,汶川611130

出　　处：《生态学报》2022年第18期7381-7389,共9页Acta Ecologica Sinica

基　　金：四川省科技计划项目(18DZYF0676);四川省林业科学研究院院基金项目;阿坝州财政专项扶贫资金项目。

摘　　要：岷江柏(Cupressus chengiana)是干旱河谷地区的重要生态恢复物种,为探讨岷江柏对干旱河谷环境的适应策略,以生长于岷江上游干旱河谷自然生境中的岷江柏为研究对象,研究分析了其在湿季(7月)和干季(11月)的水分生理特征和光合生理特征。结果表明:(1)水分生理方面,相较于湿季,干季岷江柏的脯氨酸(Pro)、可溶性糖(SS)、过氧化物酶(POD)显著增加(P<0.05),比叶重(LMA)、黎明水势(Ψ_(pl))、正午水势(Ψ_(ml))则显著下降(P<0.05);(2)光合生理方面,相较于湿季,岷江柏在干季的气孔导度(G)、蒸腾速率(T)、饱和光下最大净光合速率(P_(n max))、初始羧化效率(CE)、光合能力(A_(max))、CO_(2)补偿点(Γ)、光呼吸速率(R_(p))、最大羧化速率(V)、最大电子传递速率(J)、磷酸丙糖利用率(TPU)、J_(max)/V_(max)、光能捕获效率(F′/F′)、PSII实际光化学效率(Ф_(PSII))、光化学猝灭系数(qP)、电子传递效率(ETR)均显著下降(P<0.05),而暗呼吸速率(R_(p))、水分利用效率(WUE)、非光化学猝灭系数(NPQ)则显著上升(P<0.05)。干季,岷江柏采取增加水分获取能力并降低水分散失的水分利用策略、增加光合产物消耗策略、增加热耗散的光合器官保护策略等,以适应干季干旱、低温等环境胁迫,进而表现出较强的环境适应性。Cupressus chengiana is an important ecological restoration species in the dry valley.In order to study the adaptive strategy of C.chengiana to environment,photosynthetic physiological characteristics and water physiological characteristics of C.chengiana were measured in wet season(July)and dry season(November),respectively.The results showed that:(1)For water physiology,compared with wet season,peroxidase(POD),soluble sugar(SS)and proline(Pro)of C.chengiana increased significantly in dry season(P<0.05),but leaf mass per area(LMA),predawn leaf water potential(Ψ_(pl))and midday leaf water potential(Ψ_(ml))decreased significantly(P<0.05).(2)For photosynthetic physiology,compared with wet season,stomatal conductance(G),transpiration rate(T),light-saturated net photosynthetic rate(P_(n max)),initial carboxylation efficiency(CE),photosynthetic capacity(A_(max)),CO_(2)compensation point(Γ),photorespiration rate(R_(p)),the maximum carboxylation rate(V),the maximum electron transport rate(J),triose phosphates utilization rate(TPU),J_(max)/V_(max),excitation capture efficiency(F′/F′),actual photochemical efficiency of PSII(Ф_(PSII)),photochemical fluorescence quenching(qP)and electron transport rate(ETR)of C.chengiana decreased significantly in dry season(P<0.05),but dark respiration rate(R_(p)),water use efficiency(WUE)and non-photochemical fluorescence quenching(NPQ)increased significantly(P<0.05).In conclusion,in order to adapt to drought,low temperature and other environmental stress in dry season,C.chengiana adopted the water use strategy by increasing soil moisture acquisition ability and reducing water loss,the increasing photosynthetic product consumption strategy,and the photosynthetic organ protection strategy by increasing heat dissipation.

关 键 词：岷江柏 岷江上游干旱河谷 水分生理 光合生理 

分 类 号：Q945[生物学—植物学]