Scientia Agricultura Sinica ›› 2013, Vol. 46 ›› Issue (3): 564-574.doi: 10.3864/j.issn.0578-1752.2013.03.013

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

Correction of Kriging’s Smoothing Effect and Suitability of Selenium- Rich Tea Garden in Fenggang County of Guizhou Province

 DUAN  Jian-Jun, LAI  Fei, WANG  Xiao-Li, ZHANG  Chong-Yu, FENG  Yue-Hua   

  1. 1.Agricultural College of Guizhou University, Guiyang 550025
    2.Agricultural Products Quality Safety Supervision and Inspection Center of Guizhou Province, Guiyang 550004
  • Received:2012-04-23 Online:2013-02-01 Published:2012-09-25

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Abstract: 【Objective】 The smoothing effect of Ordinary Kriging, quantitative description and correction method, application of correction in selenium-rich tea garden suitable region in Fenggang county of Guizhou province were studied.【Method】Standard deviation and range smoothing rates were introduced to quantify smoothing effect. A quadratic regression equation based on minimum, average and maximum of measured values of sampling points and extracted values from interpolating surface to correct smoothing effect. And suitable region of selenium-rich tea garden by overlaying corrected surface was also done. 【Result】 The smoothing rates of range and standard deviation could describe the smoothing effect of Kriging in scope and variation of the data, respectively. The smoothing rates of range and standard deviation were 68.30% and 69.51% for pH and 65.33% and 60.00% for total Se. The smoothing rates of range and standard deviation were 0.00% and 6.10% for pH for corrected surface’s derived values and that were both 0.00% for total Se. The correction method developed in this paper could perfectly eliminate the smoothing effect, and ensure the unbiased estimate of the interpolation results. The suitable region of selenium-rich tea garden is 49.63 km2, which is 2.64% of the county, and which is mainly distributed in and around Tianba village, Yong’an town. 【Conclusion】The correct method developed this paper is simple, and the analyzed result of suitable region of selenium-rich tea garden based on the corrected Ordinary Kriging method is of good agreement with the actual situation.

Key words: Kriging , smoothing effect , correction , selenium-rich tea garden , Fenggang County

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