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通过在浙江天目山国家级自然保护区不同森林类型中采集酸雨,比较空旷地和6种森林林冠下酸雨的pH值动态变化,研究森林林冠对酸雨的缓冲作用。结果发现,天目山主要森林林冠对酸雨有缓冲作用,受到酸性降水的淋溶后,除了毛竹林,大部分森林类型树冠下截留的雨水pH值普遍升高,说明树冠对酸性降雨具有缓冲作用。不同季节酸雨的pH值有差异,不同森林林冠下的酸雨pH值也不同,反映不同季节森林的缓冲的幅度有差异,春季:空旷地酸雨pH值5.7,森林5.9;夏季:空旷地酸雨pH值5.3,森林5.6;秋季:空旷地酸雨pH值5.1,森林5.3;冬季:空旷地酸雨pH值4.4,森林4.8,森林对酸雨的缓冲作用以冬季最为明显。
Through the collection of acid rain in different forest types in Tianmu Mountain National Nature Reserve in Zhejiang Province and the dynamic changes of pH value of acid rain under six canopy forests, the buffer effect of forest canopy on acid rain was studied. The results showed that the main forest canopy of Tianmu Mountain had a buffer effect on acid rain. After being leached by acidic precipitation, the pH value of rainwater intercepted under canopy of most forest types was generally higher than that of Phyllostachys pubescens forest, indicating that canopy had a buffer effect on acid rain. In different seasons, acid rain had different pH values, and acid rain under different canopy forests varied in pH, reflecting the difference in buffer amplitude in different seasons. In spring, the acid rain in open desert was 5.7 and 5.9 in summer forest. In summer, the acid rain pH 5.3, forest 5.6; autumn: open area acid rain pH value 5.1, forest 5.3; winter: open area acid rain pH 4.4, forest 4.8, the buffer effect of forest on acid rain is most obvious in winter.