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International audienceWe selected two small sections of LyciumBarbarum cropland at Nuomuhong Farm in the Qaidam basin,western China: one had been farmed for only one year (original land),and the other had been farmed for many years (farm land). We testedsurface soil samples for their content and distribution of six heavymetals (Cd, Zn, Pb, Cu, As, and Cr). All six heavy metals appeared atmedium levels in samples from both sections of cropland. We conducted aninterpolation analysis and drew a spatial distribution map based on theinverse distance weight (IDW) method. The distribution graph revealed arelatively consistent distribution of the six heavy metals in soilsamples, a different gradation in the original land, and areas of highervalues in the farm land. These findings suggest that the soil had beenpolluted. According to the Pollution-Free Food Standard and the GreenFood Standard, we calculated the integrate pollution index using theNemerow index method to check whether the levels met Pollution-Free foodStandard and Green Food Standards. The values were 0.5 and 0.7 (definedas ‘clean’) in samples from the original land, but were 0.6and 0.9 in samples from the farm land, which may be consideredexcessive

The Soil Heavy Metal Information Accurate Collection and Evaluation about Lycium Barbarum Cultivation in Western China