本文研究了长白山国家级自然保护区垂直带土壤-植物系统中Pb元素含量的水平变异和垂直变异特征。结果表明,垂直带土壤Pb含量均在25mg/kg以上,且各土壤带Pb的平均含量与其变异程度相反,棕色针叶林土Pb平均含量最低但变异最大,而山地生草森林土Pb平均含量最高但变异最小;垂直带植物Pb含量均低于克拉克值,与垂直带土壤Pb含量高低基本相吻合,但其变异以高山苔原带变异最大,岳桦林带变异最小;植物Pb含量垂直分异显著高于土壤Pb含量,变异系数达89.76%;植物对Pb的富集能力依植物种类及器官不同而异;成土母质和母岩、土壤pH值、有机质及土壤质地是影响Pb在土壤-植物系统中分异的主要因素。

The characteristics of vertical variation and horizontal variation of Pb in the soil-plant system of the vertical zones in the Changbai Mountain National Nature Reserve were studied in this paper. The results showed that Pb concentrations in the soils of the vertical zones are all over 25mg/kg, and the average Pb concentration in each soil zone is negatively related to its degree of variation, i.e. in the brown coniferous forest soil zone, its average Pb concentration is the lowest of the four soil zones, but its horizontal variation the highest; whereas, in the mountain soddy forest soil, its average Pb concentration is highest, but its horizontal variation the lowest. The average Pb concentrations in plants along the vertical zones are all lower than the karat value of Pb in plant, which is basically similar to soil Pb concentration in variation. But in terms of horizontal variation,the mountain Tundra zone is the highest, while the Betula ermanii forest zone the lowest. The vertical variation of Pb concentration in plants is obviously higher than that in soils, with its variation coefficient reaching 89.76%. The enrichment capability of plants for Pb varies with the type of the plant and the organ of the plant. Parent material and parent rock, soil pH, soil organic matter and soil texture etc. are the main factors influencing variation of Pb concentration in the soil-plant system along the vertical zones in the Changbai Mountain National Nature Reserve.

中国科学院湿地创新项目(KZCX2-302)和湖沼三期项目(ZKHZ-03-06)。