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亚热带季雨林植物罗伞气体交换对光质的反应
孙谷畴;   
中国科学院华南植物研究所
摘要:
亚热带季雨林林下阴生植物罗伞(Ardisia quinquegona)叶片的气体交换速率(PN.μmol.m-2,s-1)随光强(PFD,μmol,m-2,s-1)增高而增大。在光强低于80μmol,m-2,s-1,PN=29.21PFD×10-3+0.36。在光强150μmol,m-2,s-1对出现气体交换的光饱和现象。在低光强下,气孔传导率(G,m mol,m-2,s-1与光强(m mol,m-2,s-1的关系为G=265.6 PFD+4.6。在低光强下。开阔地的阳生灌木桃金娘(Rhodmyrtus tomentosa)的气体交换速率和气孔传导率与光强关系曲线的直线部分斜率皆较罗伞的低,在红光上,罗伞叶片气体交换速率(μmol,m-2,s-1与光强(μmol,m-2,s-1的关系为PN=32.4 PFD×10-3-0.04。气孔传导率(m mol,m-2,s-1与光强(m mol,m-2,s-1的关系为G=339.08 PFD+7.37。同时气体交换速率的饱和红光光强亦较白光的高。在蓝光光强低时,气体交换速率(μmol,m-2,s-1)与光强(μmol,m-2,s-1)的关系为PN=13.54 PFD×10-3—0.17,而气孔传导率(m mol,m-2,s-1)与光强(mμmol,m-2,s-1)的关系为G=80.5 PFD+4.35。在低的蓝光下,体交换速率和气孔传导率与光强关系曲线的直线部分斜率显著较在白光和红光下的低。罗伞叶片气体交换对红光的反应敏感。
关键词:  罗伞  光质  气体交换  
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