【摘要】 根据嘉善平原区表层土壤3次不同时间的调查结果,对其表层土壤的重金属元素含量及酸碱度变化进行了分析。结果表明,重金属元素As、Cd、Cu、Hg在1990-2002年表现为累积,相对变化率最大的为Cu。2002—2008年Cd、Hg、Cu、Ni、Pb、Zn表现为累积,As、Cr略有下降,累积速率最大的为Cd。1990~2008年土壤环境质量下降显著,Ⅰ类土壤区从有到无,Ⅲ类土壤区增加了91.31 km2。土壤酸化明显,全县弱酸性土地从1990年到2008年增加了97.13 km2。预测到2013年Ⅱ类土壤区面积为116.58 km2,Ⅲ类土壤区面积为390.46 km2,占全县面积的77%。强酸性土壤区面积为29.62 km2,占5.84%,酸性土壤区面积为392.46 km2,占77.4%。更多还原

【Abstract】 The heavy metal elements and pH values of the topsoil in Jiashan County northern Zhejiang Province have been investigated in three different periods.The result shows that the As,Cd,Cu and Hg were acumulated between 1990 and 2002,dominated by Cd.From 1990 to 2008,the soil quality markedly declined.For example,I-type soil increased from zero to acumulation,and III-type soil increased by 91.31 km2.Soil acidification is significant.While the soil area with weak acidification increased by 97.13 km2 between 1990 and 2008.It is then predicted that II-type soil will cover an area of 116.58 km2 and the Ⅲ-type soil,of 390.46 km2 by 2013,which may take up the 77% of the whole area.Also,the area of strong acid and acid soil will be 29.62 km2 and 392.46 km2,taking up 5.84% and 77.4%,respectively.更多还原