模拟酸雨对广西4个树种苗木叶绿素含量的影响

Effects of Simulated Acid Rain on Chlorophyll Content of Four Species Seedlings in Guangxi

分析不同pH值及处理方式的酸雨对广西地区速生及珍贵树种幼苗叶绿素含量的影响,为此类树种对酸雨的耐受性方面研究提供理论依据。通过采用盆栽试验,设置4个水平(pH4.0、3.0、5.0、5.6),1个对照(pH6.0)总共5种处理方式,测定叶片叶绿素含量变化情况。结果表明,不同pH的酸雨处理下,巨尾桉9号、格木、降香黄檀、土沉香的叶绿素a、叶绿素b、叶绿素总含量及叶绿素a/b的变化规律不同,且同一pH值的酸雨对4个树种叶绿素a/b的影响也不相同;随着酸雨pH值的减小,各树种的叶绿素a/b总体上均表现出先降低后升高趋势。

This paper analyzed the effect of simulated acid rain with different pH values and different treatments on chlorophyll content of four fast-growing and precious tree species in Guangxi,to provide theory basis for acid tolerance assessment in such kind of trees.By pot experiment method,four pH treatment levels(pH4.0,pH3.0,pH5.0,pH5.6)and one control(pH6.0)with five different treatments were adopted,and the chlorophyll content were determined in the whole process.The results showed that under different acid rain,the content of chlorophyll a,chlorophyll b,total chlorophyll and chlorophyll a/b of E.grandis×E.urophylla No.9,Erythrophleum fordii Oliv,Dalbergia odorifera T.Chen and Aquilaria sinensis(Lour.)Gilg showed significant difference,and the chlorophyll a/b was different under same acid rain in four species;under simulated rain,with the decrease of pH in acid rain,the chlorophyll a/b showed the trend of initial decrease and then increase,further more,different pH acid rain significantly affected the different chlorophyll index.