供氮和增温对倍增二氧化碳浓度下荫香叶片光合作用的影响

摘要/Abstract

摘要： 供给0～0.mgN的盆栽荫香(Cinnamomum burmannii)幼树分别生长在倍增CO₂(+CO₂,731umol·mol^-1)和正常空气CO₂浓度(CO₂,35μmol·mol^-1)的生长箱内,昼夜温度分别为25/23℃和32/25℃,自然光照下生长30d.以生长在CO₂和25/23℃下的植株为对照研究增温和氮对+CO₂叶片光合作用的影响.结果表明,在+CO₂和25/23℃下无氮和氮处理植株的平均光合速率(Pnsat)较+CO₂和32/25℃下的叶片高5.1%,温度增高降低叶片Pnsat;而Pnsat随供氮而增高.在+CO₂条件下,生长在32/25℃下的叶片Rubisco最大羧化速率(V_cmax)和最大电子传递速率(J_max)较25/23℃下的低(P＜0.05),温度增高降低+CO₂下叶片的V_cmax和J_max在+CO₂下叶片光合呼吸速率(R_p)较低,生长温度增高提升R_p.在CO₂下生长温度从25/23℃增至32/25℃,叶片的Rubisco含量(N_R)和Rubisco活化中心浓度(M)降低,而供氮能增高NR和M.供氮能减缓温度增高对倍增CO₂下荫香叶片光合作用的限制.

关键词: 荫香, 光合作用的限制, 温度增高, CO₂浓度增高

Abstract: In this study,potted C.burmannii saplings were cultured in a top-closed chamber with elevated CO₂(+CO₂,731 μmol·mol^-1) and ambient CO₂(CO₂,365 μmol·mol^-1),and at diurnal temperature(day/night) 25/23 and 32/25,respectively.The gas exchange,calculated photosynthesis parameter,Rubisco content,and activated state of Rubisco were examined.The results showed that under +CO₂ and at 25/23,the mean photosynthetic rate(Pnsat) of sapling leaves was 5.1%higher than that under +CO₂ and at 32/25.Temperature enhancement declined Pnsat,while nitrate addition increased it.Under +CO₂,saplings had lower V_cmax and J_max at 32/25 than at 25/23.Temperatureenhancement under +CO₂ also declined V_cmax and J_max.Under +CO₂,lower photorespiration rate(R_p) occurred in leaves,but temperature enhancement could increase R_p.Under +CO₂,Rubisco content(N_R) and its active site per unit leaf area(M) decreased as diurnal temperature changed from 25/23 to 32/25.Meanwhile,nitrate addition could increase N_R and M.It may be suggested that nitrate addition could alleviate the restriction of photosynthesis under elevated CO₂ concentration and enhanced temperature.

Key words: Cinnamomum burmannii, Restriction of photosynthesis, Elevated temperature, Elevated CO₂ concentration

中图分类号:

Q945.11

孙谷畴, 赵平, 饶兴权, 蔡锡安, 曾小平. 供氮和增温对倍增二氧化碳浓度下荫香叶片光合作用的影响[J]. 应用生态学报, 2005, 16(8): 1399-1404.

SUN Guchou, ZHAO Ping, RAO Xingquan, CAI Xi'an, ZENG Xiaoping . Effects of nitrate application on alleviating photosynthesis restriction of Cinnamomum burmannii leaves under elevated CO₂ concentration and enhanced temperature[J]. Chinese Journal of Applied Ecology, 2005, 16(8): 1399-1404.

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