Soil salinity assessment of a natural pasture using remote sensing techniques in central Anatolia, Turkey.

Autor: Kılıc OM; Department of Geography, Faculty of Arts and Sciences, Tokat Gaziosmanpaşa University, Tokat, Turkey., Budak M; Department of Soil Science and Plant Nutrition, Faculty of Agriculture, Siirt University, Siirt, Turkey., Gunal E; Department of Soil Science and Plant Nutrition, Faculty of Agriculture, Tokat Gaziosmanpaşa University, Tokat, Turkey., Acır N; Department of Soil Science and Plant Nutrition, Faculty of Agriculture, Kırşehir Ahi Evran University, Kırşehir, Turkey., Halbac-Cotoara-Zamfir R; Department of Overland Communication Ways, Foundations and Cadastral Survey, Politehnica University of Timisoara, Timisoara, Romania., Alfarraj S; Zoology Department, College of Science, King Saud University, Riyadh, Saudi Arabia., Ansari MJ; Department of Botany, Hindu College Moradabad, Mahatma Jyotiba Phule Rohilkhand University Bareilly, Bareilly, Uttar Pradesh, India.
Jazyk: angličtina
Zdroj: PloS one [PLoS One] 2022 Apr 18; Vol. 17 (4), pp. e0266915. Date of Electronic Publication: 2022 Apr 18 (Print Publication: 2022).
DOI: 10.1371/journal.pone.0266915
Abstrakt: Soil salinity is a major land degradation process reducing biological productivity in arid and semi-arid regions. Therefore, its effective monitoring and management is inevitable. Recent developments in remote sensing technology have made it possible to accurately identify and effectively monitor soil salinity. Hence, this study determined salinity levels of surface soils in 2650 ha agricultural and natural pastureland located in an arid region of central Anatolia, Turkey. The relationship between electrical conductivity (EC) values of 145 soil samples and the dataset created using Landsat 5 TM satellite image was investigated. Remote sensing dataset for 23 variables, including visible, near infrared (NIR) and short-wave infrared (SWIR) spectral ranges, salinity, and vegetation indices were created. The highest correlation between EC values and remote sensing dataset was obtained in SWIR1 band (r = -0.43). Linear regression analysis was used to reveal the relationship between six bands and indices selected from the variables with the highest correlations. Coefficient of determination (R2 = 0.19) results indicated that models obtained using satellite image did not provide reliable results in determining soil salinity. Microtopography is the major factor affecting spatial distribution of soil salinity and caused heterogeneous distribution of salts on surface soils. Differences in salt content of soils caused heterogeneous distribution of halophytes and led to spectral complexity. The dark colored slickpots in small-scale depressions are common features of sodic soils, which are responsible for spectral complexity. In addition, low spatial resolution of Landsat 5 TM images is another reason decreasing the reliability of models in determining soil salinity.
Competing Interests: The authors have declared that no competing interests exist.
Databáze: MEDLINE
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