硫酸型酸雨对红豆杉生理生态的影响

发布时间：2018-01-30 00:04

本文关键词： 酸雨红豆杉生理生态特征　出处：《北方园艺》2016年24期 　论文类型：期刊论文

【摘要】：以长势良好的红豆杉中部枝条上的叶片为试材,采用人工配制pH分别为6.7、5.6、4.0、2.5的酸雨模拟溶液连续喷洒叶片4d,以自来水喷洒对照组,测定供试叶片的叶绿素荧光参数、叶绿素含量、相对电导率和抗氧化物酶的变化值。结果表明:随着时间推移,红豆杉的Fv/Fm值、叶绿素含量呈下降趋势,pH 2.5时,Fv/Fm值、叶绿素含量下降程度最大;红豆杉的相对电导率、过氧化氢酶(CAT)、超氧化物歧化酶(SOD)、过氧化物酶(POD)活性均呈上升趋势,pH 2.5时上升幅度最大;表明酸雨对红豆杉生长的各项生理指标有显著影响。
[Abstract]:The leaves on the middle branches of Taxus chinensis were sprayed with simulated acid rain solution with pH 6.75.64.0C 2.5 for 4 days. The chlorophyll fluorescence parameters, chlorophyll content, relative conductivity and antioxidant enzyme of leaves were measured with tap water spraying control group. The results showed that the Fv/Fm value of Taxus chinensis was increased with time. The value of FV / FM was decreased at pH 2.5, and the decrease of chlorophyll content was the largest. The relative electrical conductivity of Taxus chinensis, the activities of catalase CATX, superoxide dismutase (SOD) and peroxidase (POD) were all increased with pH 2.5. The results showed that acid rain had a significant effect on the physiological indexes of Taxus chinensis growth.
【作者单位】：信阳农林学院林学院;
【基金】：国家自然科学基金资助项目(11371306) 河南省科技厅计划资助项目(2013-332)
【分类号】：S791.49;X517
【正文快照】： 酸雨是指雨水形成和降落过程中,由于吸收了空气中的二氧化硫和氮氧化合物等物质,使自身pH小于5.6的降水[1]。酸雨可导致土壤酸化,损坏金属及建筑物,并且当酸雨的pH达到一定数值时,会损坏植物的超微结构,降低叶绿素含量和光合效率,进而导致作物减产[2]。红豆杉是红豆杉属植物的

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