Scientia Agricultura Sinica ›› 2013, Vol. 46 ›› Issue (22): 4716-4725.doi: 10.3864/j.issn.0578-1752.2013.22.009

• SOIL & FERTILIZER·WATER-SAVING IRRIGATION·AGROECOLOGY & ENVIRONMENT • Previous Articles     Next Articles

Comparison of Spatial Prediction of Soil Properties Under Different Sampling Sizes

 CHAI  Xu-Rong-1, HUANG  Yuan-Fang-2   

  1. 1.College of Urban and Environmental Science, Shanxi Normal University, Linfen 041000, Shanxi
    2.College of Resources and Environmental Science, China Agricultural University, Beijing 100094
  • Received:2012-06-14 Online:2013-11-15 Published:2013-06-07

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Abstract: 【Objective】The objective of this study was to investigate the impact of the sample size on the accuracy of the spatial prediction of soil properties.【Method】Soil organic matter(SOM), mass water content of soil, soil available potassium and available manganese were used as research objects, the methods of moments (MoM) and the residual maximum likelihood (REML) were used to compute the variogram of soil properties. Predictions based on the MoM and REML variograms were compared under different sampling sizes.【Result】Whether the MoM or REML was used, there was a significantly improved prediction accuracy for each soil variables with the increase of the sampling size from 50 to 70. As the number of samples gradually increased from 70 to 150, the prediction accuracy was not significantly improved. Predictions based on REML variograms were not more accurate than those from MoM variograms with the inreasion of sampling size from 50 to 150.【Conclusion】The number of samples has a significant impact on the accuracy of prediction of soil properties. When the number of samples is less than 70, the predictions are not reliable regardless of which variogram is used.

Key words: sampling sizes , variogram , method of moments , residual maximum likelihood

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