Characterizing the risk assessment and baseline value of trace elements and heavy metals in agricultural soils in surrounding Sumani watershed
1) Faculty of Life and Environmental Science, Shimane University, Japan; Polytechnic of Agriculture Payakumbuh, Indonesia;
Received …………………; accepted …………………..
Probability maps gave insight into risk assessment of environmental metals in a Sawah and agricultural field.
Baseline value for heavy metals were mooted in Sumani watershed, an emblematic agricultural area of the West Sumatra in Indonesia. Soil heavy metal concentration is interconnected to crop quality and eventually people’s health . Hundred soil samples were chosen in top soil of sawah, vegetables, Agroforestry, forest, Tea and shrub/grass to characterize the spatial variability of Pb, B, Cd, Co, Cu, Fe, Mn and Zn. Kriging was carried to map the spatial pattern of trace elements and heavy metals. Sawah, agroforestry and vegetable garden exhibited a high content for some heavy metals (Pb and Cd) and were statistically identified as excess baseline guide value. Baseline guide values proposed were 15.1 mg kg-1 for Cd, 4.89 mg kg-1 for B, 0.37 mg kg-1 for Cd, 1.67 mg kg-1 for C0, 6.81 mg kg-1 for Cu, 764 mg kg-1 for Fe, 127.42 mg kg-1 for Mn and 15.95 mg kg-1 for Zn. Pollution by heavy metals in Sawah, Agroforestry and vegetable areas is due to along history of land management since introducing green revolution technology. The spatial variability of heavy metals since green revolution was resolute for Pb and Fe based on fertilizer and pesticide application and the other elements based on characteristic of the soil parent material. The result of this research could give insight into risk assessment of environmental pollution and decision-making for agriculture.
Keyword: Heavy metal, kriging, guide value, risk assessment