模拟酸雨对龙眼叶绿体活性的影响

摘要/Abstract

摘要： 研究了模拟酸雨对龙眼叶绿体活性的影响.结果表明,pH≤3.5的酸雨胁迫使叶绿素(Chl)、类胡萝卜素(Car)含量下降.Chl含量的下降是Chla含量下降的结果,Chlb对酸雨的反应不敏感,因而Chla/Chlb下降.Chl和Car含量、Chla/Chlb随胁迫时间的延长而下降.光照加剧了酸雨对光合色素的伤害.酸雨胁迫使叶绿体光还原活性、光合磷酸化活性、H⁺-ATPase活性降低,电子传递链的破坏与磷酸化解偶联,从而使叶绿体不能有效吸收、传递、转换光能.光合磷酸化过程对酸雨胁迫的反应比光还原过程敏感.

关键词: 模拟酸雨, 龙眼, 叶绿体活性, 光合作用, 地形, 喀斯特, 土壤水解酶活性, 土地利用类型, 地统计, 空间异质性

Abstract: Adecreased content of chlorophyll (Chl) and carotenoid (Car) was found in the Dimorcarpus longana Lour. cv. wulongling leaves when treated with <pH3.5 acid rain. The decline of Chl content was caused by the reduction of Chla,while Chlb was less sensitive to the acid rain,which resulted in a decrease of Chla/Chlb ratio. The content of Car and the ratio of Chla to Chlb reduced with the duration of stress time. The injury of acid rain to photosynthetic pigments was intensified by illumination. The activities of photoreduction,photophosphorylation and H⁺ ATPase activity decreased with the reduction of pHvalue under the simulated acid rain. Therefore,the injury of electron transport chain and the uncoupling of photophosphorylation might lead to the ineffective absorption,transportation and transformation of light energy. In our study,the process of photophosphorylation was more sensitive to acid rain than that of photoreduction.

Key words: Simulated acid rain, Dimorcarpus longana Lour cv wulongling, Chloroplast activity, Photosynthesis, Karst, soil hydrolase activity, land form, goestatistics, spatial heterogeneity, land use type

中图分类号:

邱栋梁, 刘星辉. 模拟酸雨对龙眼叶绿体活性的影响[J]. 应用生态学报, 2002, (12): 1559-1562.

QIU Dongliang, LIU Xinghui . Effects of simulated acid rain on chloroplast activity in Dimorcarpus longana Lour cv wulongling leaves[J]. Chinese Journal of Applied Ecology, 2002, (12): 1559-1562.

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