Application of a digital soil mapping method in producing soil orders on mountain areas of Hong Kong based on legacy soil data

Xiao-Lin SUN, Yu Guo ZHAO, Gan-Lin ZHANG, Sheng-Chun WU, Yu Bon MAN, Ming Hung WONG

Research output: Contribution to journalArticles

13 Citations (Scopus)

Abstract

Based on legacy soil data from a soil survey conducted recently in the traditional manner in Hong Kong of China, a digital soil mapping method was applied to produce soil order information for mountain areas of Hong Kong. Two modeling methods (decision tree analysis and linear discriminant analysis) were used, and their applications were compared. Much more effort was put on selecting soil covariates for modeling. First, analysis of variance (ANOVA) was used to test the variance of terrain attributes between soil orders. Then, a stepwise procedure was used to select soil covariates for linear discriminant analysis, and a backward removing procedure was developed to select soil covariates for tree modeling. At the same time, ANOVA results, as well as our knowledge and experience on soil mapping, were also taken into account for selecting soil covariates for tree modeling. Two linear discriminant models and four tree models were established finally, and their prediction performances were validated using a multiple jackknifing approach. Results showed that the discriminant model built on ANOVA results performed best, followed by the discriminant model built by stepwise, the tree model built by the backward removing procedure, the tree model built according to knowledge and experience on soil mapping, and the tree model built automatically. The results highlighted the importance of selecting soil covariates in modeling for soil mapping, and suggested the usefulness of methods used in this study for selecting soil covariates. The best discriminant model was finally selected to map soil orders for this area, and validation results showed that thus produced soil order map had a high accuracy. Copyright © 2011 Soil Science Society of China. Published by Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)339-350
JournalPedosphere
Volume21
Issue number3
Early online date28 Apr 2011
DOIs
Publication statusPublished - Jun 2011

Citation

Sun, X.-L., Zhao, Y.-G., Zhang, G.-L., Wu, S.-C., Man, Y.-B., & Wong, M.-H. (2011). Application of a digital soil mapping method in producing soil orders on mountain areas of Hong Kong based on legacy soil data. Pedosphere, 21(3), 339-350. doi: 10.1016/S1002-0160(11)60134-3

Keywords

  • Decision tree analysis
  • Linear discriminant analysis
  • Soil covariate selection

Fingerprint Dive into the research topics of 'Application of a digital soil mapping method in producing soil orders on mountain areas of Hong Kong based on legacy soil data'. Together they form a unique fingerprint.