Abstract:

【Objective】Study the content level of nutrient elements in the potato-soil system，to screen featured potato products in plateau areas，and optimize potato quality.【Methods】The nutrient elements such as Se、Cu、Zn、Fe、Mg、Sr、Mn、I and Cr in potatoes and the rhizosphere soil in the eastern part of Qinghai Province were investigated and analyzed. And the nutrient element level and the absorption pattern in potatoes and the soil environment were evaluated using characteristic parameters，enrichment coefficients and correlation analysis.【Results】In eastern Qinghai Province，the average soil Se content was 421.3 μg/kg，Cu was 27 mg/kg，Zn was 78 mg/kg，Fe was 45 900 mg/kg，Mg was 28.41 g/kg，Mn was 651 mg/kg，I was 2.6 mg/kg，Sr was 280 mg/kg and Cr was 81 mg/kg. Se，Sr，Mg and Cr were significantly enriched，and the study area was predicated to be selenium-rich，high-strontium，high-magnesium，and moderate-chromium soil. The average content of Se in potatoes was 10.6 μg/kg，Cu was 1.3 mg/kg，Zn was 2.8 mg/kg，Fe was 7.65 mg/kg，Mg was 0.24 g/kg，Mn was 1.1 mg/kg，I was 0.03 mg/kg，Sr was 1.0 mg/kg，and Cr was 0.05 mg/kg. The selenium-enrichment rate of potatoes was 18.8%. According to the enrichment coefficient strength of nutrient elements in potatoes，potatoes had the characteristics of favoring Cu and Zn，and repelling Cr and Fe. According to the correlation evaluation of elements in the soil-potato system，it was inferred that the sequence combination of Mg-Mn-Zn and Se-I existed in the elements uptake mechanisms of potatoes.【Conclusion】The eastern of Qinghai Province had unique natural resource advantages，had selenium-rich，high-strontium，high-magnesium，and moderate-chromium soil. Based on the elements uptake mechanisms of potatoes，selenium-rich and high-magnesium featured potatoes could be cultivated.

Key words: Eastern Qinghai, Selenium-rich soil, Potato, Enrichment coefficient, Nutrient elements