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脂松(Pinus resinosa)是北美东北部地区重要的造林树种之一,2004年在我国东北东部山地引种栽培初步获得成功.为扩大脂松栽培范围,采用盆栽方法研究不同土壤酸度(pH分别为4.5、5.5、6.5、7.5和8.0)对脂松苗木光合和叶绿素荧光参数的影响,确定其适生的土壤酸度范围.结果表明:土壤酸度对脂松苗木针叶叶绿素a、b和叶绿素含量、类胡萝卜素含量、净光合速率(Pn)和荧光参数Fo、Fm、Fv、Fv/Fm、ΦPSⅡ有显著影响(P<0.05)·pH5.5处理的叶绿素含量和Pn最高,分别比pH7.5和8.0处理增加41%、50%和61%、88%;pH7.5和8.0处理时最低·pH5.5时叶绿素荧光参数Fv/Fm和ΦPSⅡ均最高,分别比pH7.5和8.0处理增加8%、12%和22%、35%;pH7.5和8.0时则受到明显抑制.土壤pH值为5.5时最适宜脂松生长.
Pinus resinosa was one of the important afforestation species in the northeastern North America and was initially successfully introduced in the mountainous areas of northeastern Northeast China in 2004. To expand the range of Pinus thunbergii cultivation, the pot experiment was conducted to study the effects of different soil acidity (pH 4.5 , 5.5, 6.5, 7.5 and 8.0) on the photosynthesis and chlorophyll fluorescence parameters of Pinus tabulaeformis seedlings, and determined their suitable range of soil acidity.The results showed that soil acidity significantly affected chlorophyll a, b and chlorophyll content, (P <0.05). The contents of chlorophyll and Pn in pH5.5 were the highest, which were respectively higher than those of pH7.5 and pH7.5 8.0, 41%, 50% and 61%, 88% respectively. The lowest chlorophyll fluorescence parameters Fv / Fm and ΦPSⅡ were the highest at pH 7.5 and 8.0, respectively, , 12% and 22%, 35%, respectively, and significantly inhibited at pH7.5 and pH 8.0.