Spatial Distribution Characteristics and Pollution Evaluation of Soil Iron in the Middle Hanjiang River
| Autor: | Feichao Wang, Zhaohong Feng, Peng Li, Yuting Cheng, Guoce Xu, Kexin Lu, Tiegang Zhang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Pollution
China Watershed Health Toxicology and Mutagenesis media_common.quotation_subject Iron Drainage basin lcsh:Medicine Soil science 010501 environmental sciences Structural basin Spatial distribution 01 natural sciences Article Multivariate interpolation Soil Rivers Soil Pollutants pollution assessment 0105 earth and related environmental sciences media_common geography soil iron Spatial Analysis geography.geographical_feature_category Land use lcsh:R Public Health Environmental and Occupational Health 04 agricultural and veterinary sciences geostatistical 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Environmental science Spatial variability spatial interpolation Environmental Pollution Environmental Monitoring |
| Zdroj: | International Journal of Environmental Research and Public Health Volume 16 Issue 21 International Journal of Environmental Research and Public Health, Vol 16, Iss 21, p 4075 (2019) |
| ISSN: | 1660-4601 1661-7827 |
| Popis: | Soil iron has an important impact on the ecological environment and on crop growth. This study selected a typical small watershed basin in the middle reaches of the Han River (Yujiehe) at Ankang City and used geostatistical methods and kriging interpolation to analyze the spatial distribution and structure of soil iron content for different land uses and at different depths, using the single-factor pollution evaluation to evaluate the pollution degree of soil iron. The results showed that soil iron in the Yujie River basin decreased with increasing soil depth, with contents of 8.80 mg/kg, 5.52 mg/kg, and 4.92 mg/kg at depths A1 (0&ndash 20 cm), A2 (20&ndash 40 cm), and A3 (40&ndash 60 cm). According to the classification index of effective trace elements in soil, the average contents of soil iron at these three depths were between 4.5 and 10 mg/kg, which are all considered moderate values. The coefficients of variation of soil iron at the three soil depths were 59%, 75%, and 83%, all of which showed moderate spatial variability, and the coefficient of variation increased gradually with soil depth. With semi-variance calculated at the three soil depths, soil iron optimal theoretical models were all exponential models with nugget coefficients of 9.52%, 47.76%, and 33.93%, indicating that spatial correlation was very strong in the A1 layer and moderate in the A2 and A3 layers. The spatial distribution of soil iron showed some variation in the study area, and the soil content was higher in the midwestern part in the A1 and A2 layers however, in the A3 layer, the higher content was in the center and lower content was in the southern region. Correlations were significant between soil iron content on the one hand and land-use type and topographic factors on the other. The pollution indices of soil iron at the three soil depths under different land uses were all greater than 1.0, with the A1 layer in farmland being the worst, at 3.34. In the study area, using the background value of soil iron as an evaluation standard, the soil iron content of more than 65% of the Yujiehe region exceeded this standard. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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