《Table 1 Characteristics of soil organic matter content in the study areas in 2010》

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《Spatial and Temporal Variability of Soil Organic Matters in Se-rich Areas of Hainan Island in Recent 30 Years》

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The mathematical statistics of soil organic matter content in cities and counties in Hainan in the 2010s are shown in Table 1.The range of soil organic matter content varied from 1.7 g/kg to96.4 g/kg，and the distribution of soil organic matter content not only varied widely，but also had high degree of variation with the coefficient of variation of 53.8%.Therefore，the overall difference in soil organic matter content in cultivated land in Hainan Island in 2010 was relatively large.There were great differences in the soil organic matter content between the Se-rich areas in different cities and counties of Hainan.The average value of soil organic matter content was the highest in Haikou City of 47.5 g/kg，and the lowest in Lingao County of 16.8 g/kg.