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《Acta Pedologica Sinica》 1983-04
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OPTIMAL ESTIMATION OF SOIL SURVEY DATA BY GEOSTATISTICAL METHOD——SEMI-VARIOGRAM AND BLOCK KRIGING ESTIMATION OF TOPSOIL NITROGEN OF ZHANGWU COUNTY

Xu Jiyan(Institute of Forestry and Soil Scinence, Academia Sinica) R. Webster(Rothamsted Experimental Station, U. K.)  
Kriging is a method of estimating values of properties at places without bias and with minimum error from observed values in the neighbourhood. The method was applied to measurements of total nitrogen in the top layers of the soils in Zhangwu County in China.After transforming the measurements to logarithms to stabilize their variances, the semi-va-riogram was computed from them. The semi-variogram showed spatial dependence extending to 50 bm, although it had a large non-spatial, or "nugget" component. Mathematical models were fitted, and the one giving the best fit in a least square sense was used to estimate values and their estimation variances on a fine grid (1.25 km) from which isorithmic maps of the county were drawn.
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【Co-references】
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1 SHAN Yang-tian et al(China University of Geosciences(Beijing),Beijing 100083);On the Karst Rocky Desertification Trends in the Process of Sustainable Development in Southwest China[J];Journal of Anhui Agricultural Sciences;2009-02
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