【摘要】 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。更多还原

【Abstract】 Canopy buffering of different forest types under acid rain was investigated by comparison of acid precipitation pH at open land and under six forest types canopy by field measurement in Tianmu Mountain National Nature Reserve,Zhejiang province.The results indicated that tested forest canopy had buffering effect of acid rain,but varied with seasons and forest canopy.pH value in the spring was 5.7 at the open land and 5.9 under forest canopy,that was 5.3 in the summer at the open land and 5.6 under forest canopy,and 5.1 in autumn at the open land and 5.3 under forest canopy,and 4.4 in winter at the open land and 4.8 under forest canopy.The result showed that it had the best buffering effect of forest canopy of acid rain in winter.更多还原