Soil organic matter(SOM) distribution has obvious spatial differences as fertility index in grassland.The reasonable sampling number in field for SOM is based on the spatial variability of nutrient factor and the required data precision.The classical statistics method and geo-statistics method were used to analyze the spatial variability of grassland SOM in Yunwu Mountain in a 90 m by 90 m grid.The result indicated that most of the reasonable number of SOM can be reduced sharply.SOM presented Medium Intensi...
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