福建土壤对酸沉降的相对敏感性评价与区划

Evaluation and Mapping of Relative Sensitivity of the Soils to Acidic Deposition in Fujian

选择母岩、土壤类型、土地利用和降雨量 4个生态因子 ,应用半定量化方法对其进行类目划分和权重 ,综合评价了福建省土壤对酸沉降的相对敏感性 ,并应用地理信息系统进行了区划 .由于福建省风化缓慢的硅质岩所占的比例较大 ,土壤大多呈酸性至微酸性反应 ,降水丰富 ,加之针叶林面积大 ,所以全省有 60 %以上面积的土壤显示出较大的敏感性等级 (5～ 7级 )

Based on the semi quantitative approach,4 environmental factors of sites (i e bedrock lithology,soil type,land use,and rainfall) are categorized,weighted and combined to determine and assess the relative sensitivity of the soils to acidic deposition over Fujian Province Then the factors have been digitized and combined to assign an overall value to each mesh square by using the geographic information system (GIS) The results indicate that the most sensitive area in Fujian is mainly located in the Southeast except a small part in the Northwest,and the least sensitive area is distributed sporadically in the East along the coast Due to slow weathering rate of siliceous rocks,acid to weakly acid reactions of the soils,along with the greater percent of coniferous forests,more than 60% of the total area exhibits higher sensitivity classes (5~7)