《Table 2 Distribution characteristics of soil organic matter in the Nandu River Basin of Hainan Prov

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《Distribution of Soil Nutrients in Nandu River Catchment basin of Hainan Island》

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The average content of soil organic matter is 18.8 g/kg.Soil organic matter content has a wide variation range of 0.1-40.5g/kg，with higher variation coefficient of 44.0%，indicating that the organic matter content in the cultivated soil of the Nandu River Basin has higher spatial variability（Table 2）.The soil organic matter content in Chengmai is the lowest，only of 14.7 g/kg，indicating that the soil in Chengmai suffers from lack of organic matter.Qiongshan has the highest soil organic matter content of 25.2g/kg among all the cities and counties，indicating that the soil is rich in organic matter.