6种草本植物对“过去-现在-未来”CO_2浓度的生长响应  

The Growth Responses of Six Herbs on the “Past-Present-Future” CO_2 Concentration

作　　者：梁千慧 刘锦春[1] 高凯敏 Johannes H.C.Cornelissen 

机构地区：[1]三峡库区生态环境教育部重点实验室/重庆市三峡库区植物生态与资源重点实验室/西南大学生命科学学院,重庆400715 [2]Department of Systems Ecology,Insititute of Ecological Science,VU University Amsterdam

出　　处：《西南大学学报（自然科学版）》2017年第1期61-68,共8页Journal of Southwest University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(31500399);教育部第49批留学回国人员科研启动基金资助项目

摘　　要：以6种草本植物泥胡菜Hemistepta lyrata,网果酸模Rumex chalepensis,野豌豆Vicia Sepium,藜Chenopodium album,风轮菜Clinopodium chinense和玉米石Sedum album为研究对象,利用步入式CO_2浓度控制生长室模拟研究了"过去(150μmol/mol)-现在(400μmol/mol)-将来(700μmol/mol)"CO_2浓度对植物生长特性的影响.结果表明:CO_2浓度升高刺激了6种植物的总生物量和相对生长速率,但CO_2浓度从过去的低浓度升高到目前浓度水平时,其升高幅度大于CO_2浓度从目前浓度升高到将来浓度水平.在过去水平下CO_2浓度升高刺激了6种植物的根质量分数,但将来水平下CO_2浓度升高对6种植物的根质量分数没有产生显著性影响.研究结果表明植物对过去CO_2浓度的适应性响应会抑制植物对将来CO_2浓度的生长响应,但不同物种之间存在差异.该研究结果有助于理解草本植物在未来气候变化下的响应,为评估和预测全球气候变化对植物的生理生态影响提供理论依据.Hemistepta lyrata,Rumex chalepensis,Vicia Sepium,Chenopodium album,Clinopodium chinense and Sedum album were used to study the effects of ＂past（150 μmol/mol）-present（400 μmol/mol）-future（700μmol/mol） ＂CO2concentrations on plants growth in walk-in CO2 concentration chambers.Results showed that CO2 concentration enrichment stimulated the total biomass and relative growth rate in all 6 species,but the increasement from the past low to the present CO2 concentration was greater than that from the current to the future CO2 concentration.The root mass fractions were all stimulated by increased CO2 concentration under present level,but not affected by increased CO2 concentration above present level.These results indicate that plant adaptations to past low [CO2]might still constrain the growth response to future high [CO2].These results were contribute to understand the herb responses to climate change in the future,and provide theoretical basises for assessing and predict the physiological and ecological impacts of global climate change on plants.

关 键 词：CO2浓度 生物量 相对生长速率 进化 全球气候变化 

分 类 号：Q945[生物学—植物学]