【摘要】 在湖南选定 2 个小流域,对小流域降雨和土壤进行了监测分析,研究了酸沉降影响下小流域土壤酸化状况.结果表明,2 个小流域降雨 pH 的体积加权平均值分别是 4.54 和 4.90;估计每年硫沉降分别是 6.6 和 5.8 g/m2,表明在 2 个小流域降雨为酸性且硫沉降较高.2 个小流域土壤 pH 在 3.94~5.19,盐基饱和度在 5.9%~56.4%,两小流域土壤有较高酸性.结合考虑在这 2 小流域高的硫沉降和土壤酸化现状,虽然在目前两小流域尚未观察到植被受土壤酸化危害的迹象,但存在潜在的生态危害.更多还原

【Abstract】 s: Two small catchments in Hunan were selected and monitored.Soil acidification was studied by analyzing precipitation and soils from the two catchments.Present soil status and potential future soil acidification in the two small catchments were assessed.Volume-weighed median pH values in precipitation were 4.54 and 4.90.Rough estimates of the corresponding total depositions (dry+wet) are 8.7 g·m-2·a-1 and 7.9 g·m-2·a-1,respectively.It was indicated that the sulfur deposition in Hunan is high.The soil pH values were in the range 3.94~5.19 and BS% in the range 5.9%~56.4% in the two catchments.Considering the high deposition of sulfate and soil properties,long-term risk of damage from soil acidification is high,especially at BLT,although damages to vegetation have not yet been observed in the catchments.更多还原