JOURNAL OF NATURAL RESOURCES ›› 2012, Vol. 27 ›› Issue (8): 1382-1391.doi: 10.11849/zrzyxb.2012.08.012

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Study on Spatial Variability of Soil Nutrients and Reasonable Sampling Number at County Scale

ZHAO Qian-qian, ZHAO Geng-xing, JIANG Huai-long, LI Min, TANG jian   

  1. College of Resources and Environment, Shandong Agricultural University, Tai’an 271018, China
  • Received:2011-08-28 Revised:2011-12-07 Online:2012-08-20 Published:2012-08-20

Abstract: Geostatistics combined with GIS was applied to analyze the spatial variability of soil nutrients in Feixian County in Shandong Province at county scale, and reasonable sampling number was also analyzed on this basis. The soil nutrient data in this study included SOM, TN, AN (alkaline hydrolyzing nitrogen), available P and available K. The results showed the coefficient of variation decreased in the order: available P>available K>SOM>AN>TN and available P has the largest coefficient of variations. SOM, TN and AK present moderate spatial dependence and larger range. Based on the spatial correlation of soil nutrients and validation, we concluded that reasonable sampling number of SOM, TN and AK was about 1035, 842 and 1033 and sampling interval was about 1352 m, 1500 m and 1354 m. AN had no spatial dependence and sampling densities should be increased later for the further study of the spatial structure features of the AN itself. Whereas available P had shorter range and presented strong spatial dependence only in a small range, which was more vulnerable to the influences of extrinsic factors such as human activities. Subsequent sampling densities cannot be lower than the current sampling densities.

Key words: soil nutrients, county scale, reasonable sampling number

CLC Number: 

  • S158