模拟酸雨对闽粤栲种子萌发和幼苗生长的影响

Effects of Simulated Acid Rain on Seed Germination and Seedling Growth of Castanopsis fissa

将闽粤栲种子和幼苗置于不同ｐＨ值的模拟酸雨条件下进行观测和分析．结果表明，ｐＨ２．０的模拟酸雨严重抑制了种子的萌发，伤害了幼苗的叶片，降低了叶绿素的含量，增加了细胞的透性，使叶汁液酸化，从而阻碍了幼苗的生长．ｐＨ３．５的模拟酸雨尽管对幼苗产生一定的负面作用，但却增加了幼苗的生物量．ｐＨ５．０和ｐＨ６．

Observation and analysis were made on seeds and seedlings of Castanopsis fissa which were subjected to a simulated acid rain adjusted to different pH levels The pH2 0 acid treatment was found to inhibit seed germination, and seedling growth by damaging foliage, decreasing chlorophyll contents, increasing leaf cell permeability, and acidifying leaf sap Whereas pH3 5 treatment increased the biomass in spite of some negative effects on seedling growth.No significant treatment effects were observed at pH values of 5 0 and 6 0