基于地学信息的土壤属性高精度曲面建模

doi:10.11821/xb201111013

Abstract

Abstract: There are two main limitations in surface modeling of soil property. One is the small number of available observations, and the other is the nonlinearity of the relationship between environmental variables and soil properties. It is still needed to research how high accuracy surface modeling (HASM) is combined with geographical information in soil property interpolation. This paper presented the method of HASM combined geographical information for soil property interpolation (HASM-SP). Based on types of soil, land use and parent rocks, we simulated the spatial distribution of soil properties of soil available P, Li, pH, alkali-hydrolyzable N, total K and Cr in a typical red soil hilly region. We compared the performance of HASM-SP, ordinary kriging (OK), ordinary kriging combined geographical information (OK-Geo) and stratified kriging (SK). The results showed that the methods combined with geographical information (HASM-SP and OK-Geo) obtained a lower estimation bias. Compared with the other three methods (OK-Geo, OK and SK), HASM-SP showed less MAEs and RMSEs. From the interpolation maps, much more details were presented in the HASM-SP maps of soil properties due to the abrupt boundary from spatial variation of geographical information. Therefore, HASM-SP can not only improve the interpolation accuracy but also characterize the spatial variation of soil property surface in the abrupt boundary, which can make the map consistent with the true geographical information. HASM-SP has great significance for enriching the theory of high accuracy surface modeling of soil property, and providing scientific evidence for the application of the soil management, precision agriculture and regional environment planning.

Key words: high accuracy surface modeling (HASM), spatial interpolation, accuracy, geostatistics, soil properties, red soil hilly region in South China

SHI Wenjiao, LIU Jiyuan, DU Zhengping, YUE Tianxiang. High Accuracy Surface Modeling of Soil Properties Based on Geographic Information[J].Acta Geographica Sinica, 2011, 66(11): 1574-1581.

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High Accuracy Surface Modeling of Soil Properties Based on Geographic Information

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