安徽砀山县土壤锌地球化学特征及影响因素

Geochemical characteristics and influence factor of soil types in Dangshan County of Anhui Province

通过开展安徽省砀山县1∶5万土地质量地球化学调查,研究该区表层土壤锌(Zn)地球化学特征,结果发现了大面积富锌土壤,并分析了其影响因素。研究区表层土壤中w(Zn)为26.8×10^(-6)~169.9×10^(-6),平均值为65.8×10^(-6),其中富锌土壤面积达到224.47 km ^(2),占比23.88%。不同土壤类型Zn含量差异较大,其中淤土Zn含量最高,平均w(Zn)=82.1×10^(-6)。富锌土壤主要分布在研究区南部关帝庙镇地区和东北部葛集镇地区,分布特征主要受土壤类型影响。垂向剖面特征表明,土壤Zn含量与有机质含量、土壤黏粒含量呈正相关,与土壤pH值呈负相关。此外,通过研究富锌土壤区油桃和芹菜根系土中Zn全量和有效态的相关性,发现两者含量呈显著正相关,为进一步开发富锌农产品提供了依据。

According to 1∶50000 geochemical survey of land quality in Dangshan County,Auhui and the study of zinc geochemical characteristics of the surface soil in the study area,a large area of zinc-rich soil is discovered and the influence factors are analyzed and summarized.The zinc content of surface soil in the study area ranges from 26.8×10^(-6)to 169.9×10^(-6),with an average value of 65.8×10^(-6).The zinc-rich soil area is up to 224.47 km^(2),accounting for 23.88%of the whole county.The zinc contents of soil types are quite different from each other,and the zinc content of silt soil is the highest,with an average value of 82.1×10^(-6).Zinc-rich soil area is mainly distributed at Guandimiao Town in the south of the study area and Geji Town in the northeast of the study area,and their distribution feature is mainly affected by the soil type.The characteristics of the vertical profile shows that the zinc content of the soil is positively correlated with the organic material content and the soil clay content,and it is negatively correlated with the soil pH value.In addition,for the study of the correlation between the total amount of zinc and the available state in the root soil of nectarine and celery in the zinc-rich soil area,it is found that the two contents are significantly in positive correlation.The study result can provide a basis for the further development of zinc-rich agricultural products in the county.