检索结果-南通市图书馆

soil polygon disaggregation through similarity-based prediction with legacy pedons

Journal of Arid Land 2016年第5期8卷 760-772页

作者： LIU Feng GENG Xiaoyuan ZHU A-xing Walter FRASER SONG Xiaodong ZHANG Ganlin State Key Laboratory of soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of Sciences Science and Technology Branch Agriculture and Agri-Food Canada School of Geography Nanjing Normal University Department of Geography University of Wisconsin-Madison

conventional soil maps generally contain one or more soil types within a single soil *** their geographic locations within the polygon are not *** restricts current applications of the maps in site-specific agricultural management and environmental *** examined the utility of legacy pedon data for disaggregating soil polygons and the effectiveness of similarity-based prediction for making use of the under-or over-sampled legacy pedon data for the *** method consisted of three ***,environmental similarities between the pedon sites and each location were computed based on soil formative environmental ***,according to soil types of the pedon sites,the similarities were aggregated to derive similarity distribution for each soil ***,a hardening process was performed on the maps to allocate candidate soil types within the *** study was conducted at the soil subgroup level in a semi-arid area situated in Manitoba,*** on 186 independent pedon sites,the evaluation of the disaggregated map of soil subgroups showed an overall accuracy of 67% and a Kappa statistic of *** map represented a better spatial pattern of soil subgroups in both detail and accuracy compared to a dominant soil subgroup map,which was commonly used in *** predictions mainly occurred in the agricultural plain area and the soil subgroups that are very similar in taxonomy,indicating that new environmental covariates need to be *** concluded that the combination of legacy pedon data with similarity-based prediction is an effective solution for soil polygon disaggregation.

关键词： legacy pedon data similarity-based prediction spatial disaggregation conventional soil maps

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