浙江温州山地丘陵地区土壤地球化学特征与生态环境评价

Soil geochemical characteristics and ecological environment evaluation in mountainous and hilly area of Wenzhou,Zhejiang Province

基于浙江省温州市多目标区域地球化学调查获取的表、深层土壤地球化学数据,采用正态和对数正态法进行统计分析,获得温州市山地丘陵区土壤54种元素(指标)的地球化学基准值和背景值,以及其分布特征;将结果与全国土壤丰度、温瑞平原和长江三角洲进行对比发现:Be、Bi、Br、Ga、Ge、Hg、Pb、Rb、Se、Sn、Th、Tl、U、W、Y、Zr、Al2O3、La、Mo、Nb、SiO2的基准值和背景值都高于全国土壤丰度;Ge、Se、Th、Tl、U、W、Mo、Nb、SiO2背景值高于温瑞平原,其基准值高于长江三角洲;各元素表层和深层的变异系数基本一致,表明调查区土壤地球化学分异程度基本对应;Na2O、Cd、P、Corg、Tc和N呈现明显的表生富集特征;就不同的p H值范围而言,Ca O、Al2O3、K2O、P以及除Hg以外的重金属元素均在碱性环境含量中高,较多元素在中性环境中趋于稳定。调查区生命元素Se含量丰富,为富Se产业发展提供了物质基础。

based on the surface and deep soil data that obtained from the Multi-target Regional Geochemical Survey of Wenzhou in Zhejiang Province,we calculated geochemical baseline and background values of 54 elements(indicators)in soil with the method of normal distribution and logarithmic normal distribution,and get their distribution characteristics;Compared with national values、Wenrui Plain values and Yangtze River delta values,The baseline and background values of Be,Bi,Br,Ga,Ge,Hg,Pb,Rb,Se,Sn,Th,Tl,U,W,Y,Zr,Al2O3,La,Mo,Nb,SiO2are all higher than the national soil abundance;At the same time,the background values of Ge,Se,Th,Tl,U,W,Mo,Nb and SiO2are higher than those of Wenrui plain and the baseline values are higher than those of Yangtze river delta.The variation coefficients of the surface and deep layers of each element were basically the same,indicating that the degree of soil geochemical differentiation in the investigated area is basically corresponding.Na2O,Cd,P,Corg,Tc and N shows obvious supergene enrichment.For the p H value,Ca O、Al2O3、K2O、P and heavy metal elements,except Hg,are higher under alkaline conditions,SiO2is higher under acidic conditions and more elements are tening to being stable in neutral conditions.