《Table 6 Distribution of soil exchangeable Ca in the Se-rich areas of Hainan》

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《Distribution of Soil Nutrients in Se-rich Areas of Hainan Island》

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The average soil exchangeable Ca content in Se-rich areas of Hainan was 522.7 mg/kg，with the maximum and minimum values being 2 625.0 and 9.9 mg/kg，respectively.The variation range was large，and there was a certain spatial variability with a coefficient of variation of 73.4%and standard deviation of 383.4.There were some differences in soil exchangeable Ca content in different terrains（Table 6）.The content of soil exchangeable Ca was the most abundant in fluvial plains with a mean of 700.8 mg/kg，and the lowest in uplands with an average content of 441.2 mg/kg and coefficient of variation of 81.4%，indicating that its spatial variability was also great.