Spatial distribution of lead in the surface layers of mountain forest soils, an example from the Karkonosze National Park, Poland

• Published in: Geoderma 2013-01, Vol.192, p.259-268
• Main Authors: Szopka, Katarzyna, Karczewska, Anna, Jezierski, Paweł, Kabała, Cezary
• Format: Article
• Language: English
• Subjects: Agronomy. Soil science and plant productions; Altitude; Biological and medical sciences; Correlation; Earth sciences; Earth, ocean, space; Engineering and environment geology. Geothermics; Exact sciences and technology; Forests; Fundamental and applied biological sciences. Psychology; Lead; Lead (metal); Mountains; National parks; Organic matter; Pollution, environment geology; Pools; Soil; Soils; Surficial geology
• ISSN: 0016-7061; 1872-6259
• DOI: 10.1016/j.geoderma.2012.08.022

Total concentrations and pools of Pb in the surface layers of mountain soils in the Karkonosze National Park are presented and discussed in relation to site altitudes and soil properties. Soil samples were collected from a forest floor and from the depths of 0–10cm and 10–20cm in 372 monitoring sites situated in a forested zone of the Park. Particularly high concentrations of Pb (24–200mg∙kg−1, most often over 100mg∙kg−1), potentially hazardous for soil biota, were found in forest litter. The concentrations of Pb in soil layers 0–10cm and 10–20cm were in the ranges 19–248 and 4–196mg∙kg−1, respectively. Pb distribution indicated very high spatial variability, confirmed by geostatistical analysis. Calculated pools of Pb varied in a broad range: 0.16–26.6g∙m−2 (mean: 6.20g∙m−2), and correlated strongly with the stocks of organic matter, both being significantly higher in the lowest altitudinal zone (500–750ma.s.l.) compared to the highest zone (1250–1380ma.s.l.). Nevertheless, there was no simple correlation of Pb pools vs. altitude. The largest pools of Pb are stored in the layer 0–10cm. The pools of accumulated Pb determined in this study are much higher than those assessed on the basis of available data on former and present Pb deposition rates. These findings may be assigned to a seeder–feeder effect and horizontal transport of pollutants. The highest amounts of Pb were identified in three distinct areas (hot spots), in particular in the vicinities of mountain passes, which may be explained by meteorological factors as well as by the influence of local pollution. ► Pb concentrations and pools were examined in forest litter and surface soil layers ► The highest Pb concentrations, considered hazardous, occurred in forest litter ► Pb pools indicated mosaic patterns and correlated with the stocks of organic matter ► The largest Pb pools were present in soils in the lowest altitudinal zone ► Accumulated Pb pools are much higher than those assessed based on deposition rates