重庆南山雾水特性及其对马尾松(Pinus massoniana Lamb)的影响

通过对重庆南山四个样点的雾水分析表明,雾水的pH值为3.6—5.6,平均为4.5。离子成分以SO_4~(2-),Ca~(2+)和NH_4~+为主,其总浓度为同期雨水的9.3倍。雾水中还有大量的颗粒物。凝结于针叶上的雾水pH值普遍下降,可达3.0以下。酸雾对马尾松针叶中的Ca~(2+),Mg~(2+),NO_3~-等营养离子有淋失作用,对叶中叶绿素有破坏作用。雾水中的颗粒物覆盖叶表面,可堵塞气孔,影响叶片的光合作用,或造成伤斑。

CHARACTERISTICS OF FOG WATER AND ITS EFFECTS ON MASSON PINE(P/NUS MASSONIANA LAMB)IN NANSHAN MOUNTAINS,CHONGQING

The characieristics of fog water and its effects on masson pine in Nanshan mountains, Chongqing were studied. The results of fog water analysis showed that it was sulfur acidic fog with an average pH value of 4.5(3.6-5.6). The major components of the fog water were SO2-4, Ca2+and NH4+.The total ionic concentration was 9.3 times of that of the rain water at the same season. There was a large amount of particiulate-matter in the fog water. The pH value of the fog water condensed on the needles of pine decreased to 3.0 or below,indicating possibilities of le aching of Ca2+, Mg2+ and NO3- ions from the needles and the effect on needle chlorophyll. The particulate matter in the fog water might affect the needle, photosynthesis by blocking up the stomas.