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Quantitative assessment of soil parameters in western Tajikistan using a soil spectral library approach

Seiler, Bruno; Kneubühler, Mathias; Wolfgramm, Bettina; Itten, Klaus I (2007). Quantitative assessment of soil parameters in western Tajikistan using a soil spectral library approach. In: ISPRS Working Group VII/1 Workshop ISPMSRS'07: "Physical Measurements and Signatures in Remote Sensing", Davos (CH), 12 March 2007 - 14 March 2007. ISPRS, 451-455.

Abstract

Soil degradation is a major problem in the agriculturally dominated country of Tajikistan, which makes it necessary to determine and monitor the state of soils. For this purpose a soil spectral library was established as it enables the determination of soil properties with relatively low costs and effort. A total of 1465 soil samples were collected from three 10x10 km test sites in western Tajikistan. The diffuse reflectance of the samples was measured with a FieldSpec PRO FR from ASD in the spectral range from 380 to 2500 nm in laboratory. 166 samples were finally selected based on their spectral information and analysed on total C and N, organic C, pH, CaCO₃, extractable P, exchangeable Ca, Mg and K, and the fractions clay, silt and sand. Multiple linear regression was used to set up the models. Two third of the chemically analysed samples were used to calibrate the models, one third was used for hold-out validation. Very good prediction accuracy was obtained for total C (R² = 0.76, RMSEP = 4.36 g kg⁻¹), total N (R² = 0.83, RMSEP = 0.30 g kg⁻¹) and organic C (R² = 0.81, RMSEP = 3.30 g kg⁻¹), good accuracy for pH (R² = 0.61, RMSEP = 0.157) and CaCO3(R² = 0.72, RMSEP = 4.63 %). No models could be developed for extractable P, exchangeable Ca, Mg and K, and the fractions clay, silt and sand. It can be concluded that the spectral library approach has a high potential to substitute standard laboratory methods where rapid and inexpensive analysis is required.

Additional indexing

Item Type:Conference or Workshop Item (Paper), not_refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Geography
Dewey Decimal Classification:910 Geography & travel
Scopus Subject Areas:Physical Sciences > Information Systems
Social Sciences & Humanities > Geography, Planning and Development
Language:English
Event End Date:14 March 2007
Deposited On:08 May 2013 14:16
Last Modified:21 Mar 2022 08:02
Publisher:ISPRS
Number:XXXVI7/C50
OA Status:Green
Free access at:Official URL. An embargo period may apply.
Official URL:http://www.isprs.org/proceedings/xxxvi/7-c50/papers/P78.pdf
Related URLs:http://www.isprs.org/proceedings/xxxvi/7-c50/ (Publisher)
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