大气CO_(2)和O_(3)浓度增加对闽楠异戊二烯和单萜烯释放的影响  

Effects of elevated CO_(2) and O_(3) concentrations on emission of isoprene and monoterpenes in Phoebe bournei

作　　者：马方园 张莉[1] 翁子珊 赖金美 刘桂珍 郭豪 易志刚[1] MA Fangyuan;ZHANG Li;WENG Zishan;LAI Jinmei;LIU Guizhen;GUO Hao;YI Zhigang(Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation,College of Resources and Environment,Fujian Agriculture and Forestry University,Fuzhou 350002,China;College of Mechanical and Electrical Engineering,Fujian Agriculture and Forestry University,Fuzhou 350002,China)

机构地区：[1]福建农林大学资源与环境学院,土壤环境健康与调控福建省重点实验室,福州350002 [2]福建农林大学机电工程学院,福州350002

出　　处：《生态学杂志》2023年第8期1802-1810,共9页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(41877326);国家级大学生创新创业训练计划项目(S202110389019);福建省红壤山地农业生态过程重点实验室开放课题资助。

摘　　要：大气CO_(2)和O_(3)浓度增加对生态系统碳循环产生重要影响,而异戊二烯(ISO)和单萜烯(MTs)作为植物参与碳循环的中间产物,其合成与释放是生态系统碳循环的重要途径。本研究以2年龄盆栽闽楠(Phoebe bournei)为对象,设置对照(CK)、CO_(2)浓度增加(EC)、O_(3)浓度增加(EO)及CO_(2)和O_(3)浓度同时增加(EC+EO)4个处理,进行4个月的熏蒸实验,分析大气CO_(2)和O_(3)对闽楠ISO和MTs释放、光合参数的影响。结果表明:熏蒸1个月后,与CK相比,EC处理导致MTs通量显著增加(P<0.05),ISO通量降低5.6%;熏蒸4个月后,与CK相比,EC、EO和EC+EO处理下ISO和MTs通量均降低,其中,EC+EO处理下效果更显著,ISO和MTs通量分别降低了76.4%和89.6%。这主要是由于不同处理通过改变光合色素含量、调节植物气孔导度,进而引起净光合速率发生变化,净光合速率变化直接影响ISO和MTs代谢的碳源,最终影响ISO和MTs代谢。MTs组分以α-蒎烯和柠檬烯为主。CO_(2)和O_(3)浓度增加导致净光合速率随熏蒸时间逐渐降低。CO_(2)和O_(3)浓度独立和同时增加对ISO和MTs通量的影响存在差异,因此开展CO_(2)和O_(3)浓度增加对生态系统碳循环影响的研究时,建议考虑复合因子交互试验,为生态系统碳循环对全球气候变化的响应提供更可靠的数据支撑。Elevated CO_(2) and O_(3) concentrations could affect ecosystem carbon(C)cycling.Isoprene(ISO)and monoterpenes(MTs)are the intermediate products in plant C metabolism,the synthesis and release of which are important pathways of ecosystem C cycling.We conducted a 4-month fumigation experiment with two-year-old Phoebe bournei seedlings.Four treatments,namely the control(CK),elevated CO_(2) concentration(EC),elevated O_(3) concentration(EO)and simultaneously elevated CO_(2) and O_(3)(EC+EO),were set up to examine the effects of elevated CO_(2) and O_(3) concentrations on ISO and MTs release and photosynthetic parameters in P.bournei.The results showed that after one month fumigation,a significant increase in MTs fluxes(P<0.05)and a 5.6%decrease in ISO flux were observed with the EC treatment compared with CK.After 4 months'fumigation,the ISO and MTs fluxes decreased under EC,EO,and EC+EO treatments.The reduction was the strongest under EC+EO treatment,with the ISO and MTs fluxes being reduced by 76.4%and 89.6%,respectively.The decrease of fluxes might be attributed to the changes of net photosynthetic rate by changing the content of photosynthetic pigments and adjusting stomatal conductance under different treatments,which directly affects C source of ISO and MTs metabolism.The main components of MTs wereα-pinene and limonene.Under elevated CO_(2) and O_(3) concentrations,net photosynthetic rate gradually decreased with fumigation duration.The effects of independently and simultaneously elevated CO_(2) and O_(3) concentrations on ISO and MTs fluxes differed.When we investigated the effects of elevated CO_(2) and O_(3) concentrations on ecosystem C cycling,compound factor interaction experiments should be taken into consideration,to provide more reliable data support for understanding the responses of ecosystem C cycling to global climate change.

关 键 词：CO_(2)浓度增加 O3浓度增加 异戊二烯 单萜烯 光合参数 

分 类 号：S792.24[农业科学—林木遗传育种]