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Application of digital soil mapping methods for identifying salinity management classes based on a study on coastal central China
Author(s) -
Guo Y.,
Shi Z.,
Li H. Y.,
Triantafilis J.
Publication year - 2013
Publication title -
soil use and management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.709
H-Index - 81
eISSN - 1475-2743
pISSN - 0266-0032
DOI - 10.1111/sum.12059
Subject(s) - soil salinity , environmental science , soil map , salinity , land reclamation , topsoil , normalized difference vegetation index , dryland salinity , remote sensing , multispectral pattern recognition , thematic map , digital soil mapping , multispectral image , soil science , vegetation (pathology) , soil management , soil water , hydrology (agriculture) , soil organic matter , geology , soil biodiversity , cartography , climate change , geography , medicine , oceanography , archaeology , geotechnical engineering , pathology
In coastal China, there is an urgent need to increase land for agriculture. One solution is land reclamation from coastal tidelands, but soil salinization poses a problem. Thus, there is need to map saline areas and identify appropriate management strategies. One approach is the use of digital soil mapping. At the first stage, auxiliary data such as remotely sensed multispectral imagery can be used to identify areas of low agricultural productivity due to salinity. Similarly, proximal sensing instruments can provide data on the distribution of soil salinity. In this study, we first used multispectral QuickBird imagery (Bands 1–4) to provide information about crop growth and then EM38 data to indicate relative salt content using measurements of apparent soil electrical conductivity (EC a ) in the horizontal (EC h ) and vertical (EC v ) modes of operation. Second, we used a fuzzy k ‐means (FKM) algorithm to identify three salinity management zones using the normalized difference vegetation index (NDVI), EC h and EC v /EC h . The three identified classes were statistically different in terms of auxiliary and topsoil properties (e.g. soil organic matter) and more importantly in terms of the distribution of soil salinity (EC e ) with depth. The resultant three classes were mapped to demonstrate that remote and proximally sensed auxiliary data can be used as surrogates for identifying soil salinity management zones.