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A total of 50 farmland soil samples were collected from the Yanqi County, Xinjiang, China, and the concentrations of eight heavy metal elements (As, Cd, Cr, Cu, Mn, Ni, Pb and Zn) were determined by standard methods. The spatial distribution, pollution level and ecological risk status of heavy metals were analyzed based on GIS technology, the Geo-accumulation Index (Igeo), the Pollution Load Index (PLI) and the Potential Ecological Risk Index (RI). Results indicated that: (1) The average contents of Cd, Cr, Ni, Pb, and Zn of farmland soils exceeded the background values of irrigation soils in Xinjiang by 1.5, 1.40, 1.33, 2.63, and 4.92 times, respectively. Cd showed a no-pollution level, Zn showed a partially moderate pollution level, Pb showed a slight pollution level, and Cr, Cu, As, Mn, and Ni showed no-pollution level, compared to the classification standard. The PLI values of heavy metal elements of farmland soils varied from 0.83 to 1.89, with an average value of 1.29, at the moderate pollution level. (2) The Individual Potential Ecological Risk Index for heavy metals in the study area was ranked in the order of: As > Ni > Cu > Cd > Pb > Cr> Zn. The RI values of heavy metals of farmland soils varied from 3.45 to 11.34, with an average value of 6.13, at the low ecological risk level. (3) Cu and Mn of farmland soils were mainly originated from the soil parent material and topography of the study area. As, Cd, Ni and Pb were mainly originated from human activities, and Cr and Zn may originated from both natural and anthropogenic factors in the study area.
A. Mamut; M. Eziz; A. Mohammad. Pollution and Ecological Risk Assessment of Heavy Metals in Farmland Soils in Yanqi County, Xinjiang, Northwest China. Eurasian Soil Science 2018, 51, 985 -993.
AMA StyleA. Mamut, M. Eziz, A. Mohammad. Pollution and Ecological Risk Assessment of Heavy Metals in Farmland Soils in Yanqi County, Xinjiang, Northwest China. Eurasian Soil Science. 2018; 51 (8):985-993.
Chicago/Turabian StyleA. Mamut; M. Eziz; A. Mohammad. 2018. "Pollution and Ecological Risk Assessment of Heavy Metals in Farmland Soils in Yanqi County, Xinjiang, Northwest China." Eurasian Soil Science 51, no. 8: 985-993.
Significant anthropogenic and biophysical changes have caused fluctuations in the soil salinization area of the Keriya Oasis in China. The Driver-Pressure-State-Impact-Response (DPSIR) sustainability framework and Bayesian networks (BNs) were used to integrate information from anthropogenic and natural systems to model the trend of secondary soil salinization. The developed model predicted that light salinization (vegetation coverage of around 15–20%, soil salt 5–10 g/kg) of the ecotone will increase in the near term but decelerate slightly in the future, and that farmland salinization will decrease in the near term. This trend is expected to accelerate in the future. Both trends are attributed to decreased water logging, increased groundwater exploitation, and decreased ratio of evaporation/precipitation. In contrast, severe salinization (vegetation coverage of around 2%, soil salt ≥20 g/kg) of the ecotone will increase in the near term. This trend will accelerate in the future because decreased river flow will reduce the flushing of severely salinized soil crust. Anthropogenic factors have negative impacts and natural causes have positive impacts on light salinization of ecotones. In situations involving severe farmland salinization, anthropogenic factors have persistent negative impacts.
Jumeniyaz Seydehmet; Guang Lv; İlyas Nurmemet; Tayierjiang Aishan; Abdulla Abliz; Mamat Sawut; Abdugheni Abliz; Mamattursun Eziz. Model Prediction of Secondary Soil Salinization in the Keriya Oasis, Northwest China. Sustainability 2018, 10, 656 .
AMA StyleJumeniyaz Seydehmet, Guang Lv, İlyas Nurmemet, Tayierjiang Aishan, Abdulla Abliz, Mamat Sawut, Abdugheni Abliz, Mamattursun Eziz. Model Prediction of Secondary Soil Salinization in the Keriya Oasis, Northwest China. Sustainability. 2018; 10 (3):656.
Chicago/Turabian StyleJumeniyaz Seydehmet; Guang Lv; İlyas Nurmemet; Tayierjiang Aishan; Abdulla Abliz; Mamat Sawut; Abdugheni Abliz; Mamattursun Eziz. 2018. "Model Prediction of Secondary Soil Salinization in the Keriya Oasis, Northwest China." Sustainability 10, no. 3: 656.