App ication of SoLIM for a H gh- ntensify Soil Survey: A Soufhern hois Exampe

摘要

Soil mapping is based on the observed soil-landscape relationships originated by Dokuchaeiv and Hilgard and summarized by Jenny, (1941,1961) as the factors of soil formation: S = f(cl,o,r,p,t), where S refers to soil, with the factors of climate, organisms, relief, parent material, and time, respectively. The validity of this model allows for efficient and accurate production of soil maps. However, as Hudson (1992) described, a thorough understanding of soil-landform relationships is required to apply the model. The advent of geographic information systems (GIS) and associated digital data provides the opportunity to apply the soil-landscape model in a software environment (Bell et al., 1992, McSweeney et al., 1994, Zhu et al., 1996, McBratney et al., 2003). This technology has the potential of improving the accuracy and precision of the mapped soil-landscape model (Zhu et al., 2001). The SoLIM technique requires explicit definition of parameters for the controlling soil-forming factors when usingrule-based reasoning, documenting in a quantitative manner what has been qualitatively described in map unit descriptions. The use of GIS can be the tool to effectively codify the tacit knowledge of soil scientists. The benefits of using GIS are the consistent application of the rules and rapid mapping rates. This could help overcome the problem of subjectivity inherent when different soil scientists map similar areas (Bie and Beckett, 1973).