作　　者： ; ; ; ;

机构地区： 湖南大学环境科学与工程学院

出　　处： 《环境污染与防治》 2003年第5期271-273,276,共4页

摘　　要： 研究并比较了湖南酸雨区韶山小集水区林内降水的化学特征 ,结果表明 ,与大气降水相比 ,穿冠水和地表穿透水中的富集的离子浓度除了 NO3-和 Na+外均明显增加 ,到达地表的降水离子增加倍数最高达 3 4.3倍 ;离子总量最高倍数为 8.1倍 ,乔木树冠层的离子富集作用大于灌木层。韶山的大气降水、穿冠水和地表穿透水的年均 p H分别为 4.61、5 .5 4和 5 .85。 The study on the chemical properties of the forested precipitation was carried out in Shaoshan catchment, Hunan province. The results show that the ionic enrichment concentrations in both the canopy throughfall and the ground-fall significantly increase except for NO\-3\+- and Na\++, compared with those of the bulk precipitation. The largest increase of ionic concentrations rises to 34.3 times during the rainfall passage through the canopy and 8.1 times for the total ionic amounts. The ionic enrichment in the canopy is larger than that of the shrub canopy. The annual mean pH values in the rainfall, the throughfall and the ground\|fall are 4.61, 5.54 and 5.85, respectively, proving that the acidity of rainfall being much neutralized during the precipitating process.The large amount and continuous rainfall can efficiently remove the atmospheric pollutants above the forest canopy.

关 键 词： 森林 降水化学 湖南 酸雨 大气污染

领　　域： [环境科学与工程]