Environmental Monitoring and Assessment

, Volume 170, Issue 1, pp 301–309

Semiquantitative color profiling of soils over a land degradation gradient in Sakaerat, Thailand

Authors

    • EcoTopia Science InstituteNagoya University
    • Graduate School of Agricultural ScienceEhime University
  • Chongrak Wachrinrat
    • Department of Silviculture, Faculty of ForestryKasetsart University
  • Sakhan Teejuntuk
    • Department of Silviculture, Faculty of ForestryKasetsart University
  • Katsutoshi Sakurai
    • Faculty of AgricultureKochi University
  • Pongsak Sahunalu
    • Department of Silviculture, Faculty of ForestryKasetsart University
Article

DOI: 10.1007/s10661-009-1233-x

Cite this article as:
Doi, R., Wachrinrat, C., Teejuntuk, S. et al. Environ Monit Assess (2010) 170: 301. doi:10.1007/s10661-009-1233-x

Abstract

In this study, we attempted multivariate color profiling of soils over a land degradation gradient represented by dry evergreen forest (original vegetation), dry deciduous forest (moderately disturbed by fire), and bare ground (severely degraded) in Sakaerat, Thailand. The soils were sampled in a dry-to-wet seasonal transition. Values of the red–green–blue (RGB), cyan–magenta–yellow–key black (CMYK), L*a*b*, and hue–intensity–saturation (HIS) color models were determined using the digital software Adobe PhotoshopTM. Land degradation produced significant variations (p < 0.05) in R, C, Y, L*, a*, b*, S, and I values (p < 0.05). The seasonal transition produced significant variations (p < 0.05) in R, G, B, C, M, K, L*, b*, and I values. In discriminating the soils, the color models did not differ in discriminatory power, while discriminatory power was affected by seasonal changes. Most color variation patterns had nonlinear relationships with the intensity of the land degradation gradient, due to effects of fire that darkened the deciduous forest soil, masking the nature of the soil as the intermediate between the evergreen forest and the bare ground soils. Taking these findings into account, the utilization of color profiling of soils in land conservation and rehabilitation is discussed.

Keywords

Land degradation Multivariate analysis Soil color Thai savanna

Copyright information

© Springer Science+Business Media B.V. 2009