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Variations of soil lead in different land uses along the urbanization gradient in the Beijing metropolitan area.

Mao Q, Huang G, Ma K, Sun Z - Int J Environ Res Public Health (2014)

Bottom Line: Land-use types have an impact on soil Pb levels, however, when the degree of urbanization is considered, the impact from land use on soil Pb level was only significant in the transitional zone.Parks and road greenbelts were found to have lower soil Pb, primarily due to soil restoration.Given the results of soil Pb in various land-use types, we suggest that future studies consider the urbanization gradient in which different land-use samples are located.

View Article: PubMed Central - PubMed

Affiliation: Center for Human-Environment System Sustainability (CHESS), State Key Laboratory of Earth Surface Processes and Resource Ecology (ESPRE), Beijing Normal University, Beijing 100875, China. maoqizhenger@126.com.

ABSTRACT
Understanding the spatial pattern of soil lead (Pb) levels is essential to protecting human health. Most previous studies have examined soil Pb distributions by either urbanization gradient or land-use type. Few studies, however, have examined both factors together. It remains unclear whether the impacts of land use on soil Pb levels are consistent along the urbanization gradient. To fill this gap, we investigated variations in soil Pb level under different land-use types along the urbanization gradient in Beijing, China. We classified the degree of urbanization as the urban core, transitional zone, or suburban area and the land-use type as industrial area, roadside, residential area, institutional area, road greenbelt, park, or forest. Our results showed that the range of soil Pb levels in Beijing is <1 mg/kg-292 mg/kg, with a mean of 22 mg/kg. Along the urbanization gradient, the mean soil Pb level increased from the suburban area to the urban core. Land-use types have an impact on soil Pb levels, however, when the degree of urbanization is considered, the impact from land use on soil Pb level was only significant in the transitional zone. Parks and road greenbelts were found to have lower soil Pb, primarily due to soil restoration. Roadside and residential areas were found to have higher soil Pb because of traffic emissions, leaded paint, and previous industrial contamination. In the urban core and suburban area, the soil Pb level showed no significant differences among various land-use types. Given the results of soil Pb in various land-use types, we suggest that future studies consider the urbanization gradient in which different land-use samples are located.

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Box-and-whisker plots for soil Pb levels among different land uses.
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ijerph-11-03199-f004: Box-and-whisker plots for soil Pb levels among different land uses.

Mentions: Table 3 lists the mean Pb level by land use. The difference in the soil Pb among the seven land-use types is statistically significant (P = 0.004), which suggests that the soil Pb level varies by land use (Figure 4). The results of multiple comparisons detected statistically significant differences in soil Pb between roadside and parks (P = 0.006) and between roadside and road greenbelts (P = 0.028) (Figure 4).


Variations of soil lead in different land uses along the urbanization gradient in the Beijing metropolitan area.

Mao Q, Huang G, Ma K, Sun Z - Int J Environ Res Public Health (2014)

Box-and-whisker plots for soil Pb levels among different land uses.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3987030&req=5

ijerph-11-03199-f004: Box-and-whisker plots for soil Pb levels among different land uses.
Mentions: Table 3 lists the mean Pb level by land use. The difference in the soil Pb among the seven land-use types is statistically significant (P = 0.004), which suggests that the soil Pb level varies by land use (Figure 4). The results of multiple comparisons detected statistically significant differences in soil Pb between roadside and parks (P = 0.006) and between roadside and road greenbelts (P = 0.028) (Figure 4).

Bottom Line: Land-use types have an impact on soil Pb levels, however, when the degree of urbanization is considered, the impact from land use on soil Pb level was only significant in the transitional zone.Parks and road greenbelts were found to have lower soil Pb, primarily due to soil restoration.Given the results of soil Pb in various land-use types, we suggest that future studies consider the urbanization gradient in which different land-use samples are located.

View Article: PubMed Central - PubMed

Affiliation: Center for Human-Environment System Sustainability (CHESS), State Key Laboratory of Earth Surface Processes and Resource Ecology (ESPRE), Beijing Normal University, Beijing 100875, China. maoqizhenger@126.com.

ABSTRACT
Understanding the spatial pattern of soil lead (Pb) levels is essential to protecting human health. Most previous studies have examined soil Pb distributions by either urbanization gradient or land-use type. Few studies, however, have examined both factors together. It remains unclear whether the impacts of land use on soil Pb levels are consistent along the urbanization gradient. To fill this gap, we investigated variations in soil Pb level under different land-use types along the urbanization gradient in Beijing, China. We classified the degree of urbanization as the urban core, transitional zone, or suburban area and the land-use type as industrial area, roadside, residential area, institutional area, road greenbelt, park, or forest. Our results showed that the range of soil Pb levels in Beijing is <1 mg/kg-292 mg/kg, with a mean of 22 mg/kg. Along the urbanization gradient, the mean soil Pb level increased from the suburban area to the urban core. Land-use types have an impact on soil Pb levels, however, when the degree of urbanization is considered, the impact from land use on soil Pb level was only significant in the transitional zone. Parks and road greenbelts were found to have lower soil Pb, primarily due to soil restoration. Roadside and residential areas were found to have higher soil Pb because of traffic emissions, leaded paint, and previous industrial contamination. In the urban core and suburban area, the soil Pb level showed no significant differences among various land-use types. Given the results of soil Pb in various land-use types, we suggest that future studies consider the urbanization gradient in which different land-use samples are located.

Show MeSH