Using indicator kriging for evaluating heavy metal contents of a soil over serpentines
Geostatistical interpolation, kriging, is increasingly used to estimate spatial variability of soil properties and attributes. The kriging-based approach, indicator kriging (IK), may be used to model the uncertainty of mapping heavy metals. Soil samples were obtained at 53 points from the top layer of a soil developed over serpentine. Total and EDTA- extractable contents of Fe, Mn, Cr, Ni, Cu, Zn and Co were determined. The soil data were coded as 0 or 1 when higher or lower than the threshold value established as the median. Using the coded data, indicator semivariograms were computed and modelled by a nugget component plus a structure. Counter maps of probability of meeting the critical threshold value for each of the individual heavy metals were drawn by IK. Advantages of IK for assessing local uncertainty when compared with ordinary kriging were shown.
Geostatistics heavy metals indicator kriging serpentines
J. Paz Ferreiro C. A. Abreu S. R. Vieira
Universidad La Coruna, Facultad de Ciencias, A Zapateira, 15071 La Coruna, Spain Instituto Agronomico, CP 28, 13020-902, Campinas, SP, Brazil
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
1023-1024
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）