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在重度酸雨(p H 2.5)、中度酸雨(p H 4.0)和轻度酸雨(p H 5.6)3个酸雨梯度下,研究全淋处理、土壤处理和地上处理3种酸雨胁迫方式对杨梅(Myrica rubra)幼苗叶绿素荧光参数的影响。结果表明:胁迫6个月时间内,杨梅相对叶绿素含量(SPAD)、PSⅡ原初光能转化效率(Fv/Fm)、PSⅡ潜在活性(Fv/Fo)、PSⅡ实际光化学量子产量(Yield)表现为:土壤处理>地上处理>全淋处理,当胁迫6个月以上,表现为地上处理>土壤处理>全淋处理,可见全淋处理抑制作用最强,土壤处理和地上处理具有阶段性,前期地上处理抑制作用较强,后期土壤处理抑制作用较强。重度酸雨胁迫下,各处理叶绿素荧光参数值均低于对照组,中度和轻度酸雨胁迫下除全淋处理外,则高于对照组,表现出杨梅对酸雨有较强的耐受性,一定浓度的酸雨能增加杨梅叶绿素荧光参数指标。夏季和秋季的Fv/Fm、Fv/Fo、Yield值较高,冬季和春季的值较低;土壤处理、地上处理、全淋处理的Fv/Fm和Fv/Fo存在显著差异。
Under the three acid rain gradients of severe acid rain (p H 2.5), moderate acid rain (p H 4.0) and light acid rain (p H 5.6), the effects of acid rain stress, total leaching treatment, soil treatment and aboveground treatment, Effects of Myrica rubra Seedlings on Chlorophyll Fluorescence Parameters. The results showed that the relative photochemical quantum yield of SPAR, Fv / Fm, Fv / Fo, and PSⅡ of Bayberry in six months was: Soil treatment> Aboveground treatment> All-leaching treatment showed that when the stress was above 6 months, it was aboveground treatment> soil treatment> all-leaching treatment. It showed that all-leaching treatment had the strongest inhibitory effect, soil treatment and aboveground treatment had the stage, Inhibition is stronger, late inhibition of soil treatment stronger. Under severe acid rain stress, the chlorophyll fluorescence parameters of all treatments were lower than those of the control group. Except for the all-leaching treatment, the chlorophyll fluorescence parameters of medium and mild acid rain conditions were higher than that of the control group, showing that bayberry was more tolerant to acid rain, A certain concentration of acid rain can increase the chlorophyll fluorescence parameters of Myrica rubra. The values of Fv / Fm, Fv / Fo and Yield were higher in summer and autumn, and lower in winter and spring. There were significant differences in Fv / Fm and Fv / Fo between soil treatment, aboveground treatment and whole leaching treatment.