吉林省中部春秋季玉米田土壤铅含量及其有效态转化空间特征比较
基于空间分析技术的土壤重金属元素地球化学特征及其季节变化研究对于揭示土壤重金属迁移转化与土壤重金属污染预防调控具有重要意义。本文基于半变异函数与局部空间自相关方法对吉林省中部地区春秋季玉米田土壤铅元素的全量和有效态含量的空间特征进行比较,为铅元素在土壤中的富集转化规律研究和黑土资源污染修复的区域指导提供基础依据。结果表明：(1) 研究区春秋季土壤铅元素超背景值样点比率分别为100%与93.55%；春季土壤未出现铅元素污染,秋季土壤样点铅元素污染比例为3.23%；其中秋季土壤铅元素的全量与有效量均值均大于春季土壤,铅元素呈现累积活化趋势。(2) 半变异函数模拟参数显示,秋季铅元素全量C0/(C0+C)为强空间相关性,主要受随机因素影响；春季铅元素全量和有效量、秋季铅元素有效量C0/(C0+C)为中等空间相关性,受到区域性因素影响相对较强。(3)春秋季土壤铅元素全量之间,以及季节内全量与有效量之间的局部自相关空间分布差异较大；春秋季铅元素有效量分布较一致。春秋季土壤铅元素全量及有效量HH聚集区集中在中部和西南部,即长春与四平附近玉米田土壤铅元素累积与有效态转化相对较明显。
英文摘要:
Study on geochemical characteristics of soil heavy metals and their seasonal comparison based on spatial analysis methods is of significance for revealing the mechanism of accumulation and bio-available transformation of heavy metals and heavy metal contamination prevention. This paper compares the distribution characteristics of total Pb content and bio-available Pb content of soil samples collected in spring and autumn in central Jilin Province by using semivariance function and Anselin local spatial autocorrelation, with the aim of providing basic data for study on regulation of soil Pb accumulation and bio-available transformation and space utilization and planning for black soil resources. The results indicate: 1) The ratio of background value exceeded soil samples of spring and autumn are 100% and 93.55%, the ratio of Pb contaminated soil samples of autumn is 3.23% and all spring samples show no Pb contamination. The mean of total Pb content and bio-available Pb content of autumn all exceed that of spring, soil Pb show an accumulated and bio-available transformed trend. 2) Total Pb content of spring, total Pb content and bio-available Pb content of autumn all appear to strong spatial correlated, which is dominated by the impact of natural factors. Bio-available Pb content of spring of spring appears to be medium spatial correlated, which is impacted more by the human factors relatively. 3) Obvious differences of local spatial autocorrelation characteristics are found between spring total Pb and autumn total, spring total Pb and spring bio-available Pb, autumn total Pb and autumn bio-available Pb. However, local spatial autocorrelation characteristics of spring bio-available Pb and autumn bio-available Pb are similar with each other. High-High type of all Pb locates in the central and southwest part of the studied area, which shows more accumulation and bio-available transformation of Pb and its potential contamination in Changchun City and Siping City.
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