Spatial variation of soil salinity in the Mexicali Valley, Mexico

Application of a practical method for agricultural monitoring

Gabriel Judkins, Soe Myint

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

The degradation of irrigated lands through the process of soil salinization, or the buildup of salts in the soil, has hampered recent increases in agricultural productivity and threatens the sustainability of large-scale cultivation in critical agricultural regions of the world. Rapid detection of soil salinity on a regional basis has been identified as key for effective mitigation of such land degradation. The ability to detect regional patterns of soil salinity at an accuracy sufficient for regional-scale resource management is demonstrated using Landsat 5 Thematic Mapper (TM) imagery. A case study of the Mexicali Valley of Baja California, Mexico was selected due to the region's agricultural significance and concern for future soil salinity increases. Surface soil salinity was mapped using georeferenced field measurements of electrical conductivity (EC), collected concurrently with Landsat 5 TM imagery. Correlations between EC measurements and common indices derived from the satellite imagery were used to produce a model of soil salinity through regression analysis. Landsat band 7, TNDVI, PCA 1, Tasseled Cap 3 and Tasseled Cap 5 were found to offer the most promising correlations with surface soil salinity. Generally low levels of soil salinity were detected, however, distinct areas of elevated surface salinity were detected at levels potentially impacting sensitive crops cultivated within the region. The difficulty detecting low levels of salinity and the mid-range spatial resolution of Landsat 5 TM imagery restrict the applicability of this methodology to the study of broad regional patterns of degradation most appropriate for use by regional resource managers.

Original languageEnglish (US)
Pages (from-to)478-489
Number of pages12
JournalEnvironmental Management
Volume50
Issue number3
DOIs
StatePublished - Sep 2012

Fingerprint

spatial variation
Soils
valley
Monitoring
monitoring
Landsat
imagery
regional pattern
electrical conductivity
Degradation
salinity
degradation
land degradation
salinization
method
soil salinity
satellite imagery
Satellite imagery
resource management
regression analysis

Keywords

  • Agriculture
  • Land degradation
  • Mexico
  • Onion
  • Produce
  • Remote sensing
  • Soil salinization

ASJC Scopus subject areas

  • Ecology
  • Global and Planetary Change
  • Pollution

Cite this

Spatial variation of soil salinity in the Mexicali Valley, Mexico : Application of a practical method for agricultural monitoring. / Judkins, Gabriel; Myint, Soe.

In: Environmental Management, Vol. 50, No. 3, 09.2012, p. 478-489.

Research output: Contribution to journalArticle

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