【摘要】 酸雨污染对生态系统和人类生存环境造成严重影响,研究植物抗性及其对环境的适应能力是大气污染胁迫退化生态系统恢复中植物种类选择的基础和前提。作者选择陶瓷工业污染区南海西樵山和相对清洁区肇庆鼎湖山自然生长的木本植物鸭脚木(Schefflera octophylla)、荷木(Schima superba)当年生叶和一年生叶以及马尾松(Pinus massoniana)一年生针叶进行生理指标的测定和分析。结果表明:在酸雨污染环境下,3 种植物叶片的细胞膜透性受到损害,光合色素降解,PSII 最大光化学效率下降;对酸雨污染的敏感性次序为:马尾松>鸭脚木≥荷木,马尾松为酸雨敏感种。初步讨论了树木对酸雨污染的部分抗性生理机制,为酸雨污染地区退化生态系统恢复之植被选择提供理论依据。更多还原

【Abstract】 Ecosystem and human surroundings were heavily influenced by acid rain pollution. In order to provide a scientific basis for selection of plant species for reconstructing the degraded ecosystem, it is necessary to study the sensitivity and resistance of woody species as well as acclimatization to air pollution stress. This study aims to characterize the ecophysiological responses of three woody species (Schefflera octophylla, Schima superba and Pinus massoniana), grown at the Xiqiaoshan, near ceramic factories, where the pollution is heavy, and at the Dinghushan Natural Reserve, a relatively clean site. Both sites are located in the Pearl River Delta area of south China, and similar in climate and geolocations. The results showed that: growing in the polluted environment, cell membrane leakage rate of leaves was increased, content of photosynthetic pigments and maximal photochemical efficiency of PSII were decreased; The sensitivity sequence of three species to acid rain was: Pinus massoniana >Schefflera octophylla≥Schima su- perba, and Pinus massoniana was the most sensitive specie of all the three. Some physiological mechanism of tolerance of woody plants to acid rain pollution was also discussed in this paper.更多还原