Prediction of soil organic carbon for Ethiopian highlands using soil spectroscopy

Amare, Tadele; Hergarten, Christian; Hurni, Hans; Wolfgramm, Bettina; Yitaferu, Birru; Selassie, Yihenew G. (2013). Prediction of soil organic carbon for Ethiopian highlands using soil spectroscopy. ISRN Soil Science, 2013, pp. 1-11. Hindawi 10.1155/2013/720589

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Soil spectroscopy was applied for predicting soil organic carbon (SOC) in the highlands of Ethiopia. Soil samples were acquired from Ethiopia’s National Soil Testing Centre and direct field sampling. The reflectance of samples was measured using a FieldSpec 3 diffuse reflectance spectrometer. Outliers and sample relation were evaluated using principal component analysis (PCA) and models were developed through partial least square regression (PLSR). For nine watersheds sampled, 20% of the samples were set aside to test prediction and 80% were used to develop calibration models. Depending on the number of samples per watershed, cross validation or independent validation were used.The stability of models was evaluated using coefficient of determination (R2), root mean square error (RMSE), and the ratio performance deviation (RPD). The R2 (%), RMSE (%), and RPD, respectively, for validation were Anjeni (88, 0.44, 3.05), Bale (86, 0.52, 2.7), Basketo (89, 0.57, 3.0), Benishangul (91, 0.30, 3.4), Kersa (82, 0.44, 2.4), Kola tembien (75, 0.44, 1.9),Maybar (84. 0.57, 2.5),Megech (85, 0.15, 2.6), andWondoGenet (86, 0.52, 2.7) indicating that themodels were stable. Models performed better for areas with high SOC values than areas with lower SOC values. Overall, soil spectroscopy performance ranged from very good to good.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geography > Integrative Geography > Unit Sustainable Land Management
08 Faculty of Science > Institute of Geography > NCCR North-South Management Centre (discontinued)
10 Strategic Research Centers > Centre for Development and Environment (CDE)

UniBE Contributor:

Hergarten, Christian; Hurni, Hans and Wolfgramm, Bettina

Subjects:

300 Social sciences, sociology & anthropology > 330 Economics

ISSN:

2090-875X

Publisher:

Hindawi

Language:

English

Submitter:

Monika Wälti-Stampfli

Date Deposited:

03 Jun 2014 10:24

Last Modified:

26 Apr 2017 02:28

Publisher DOI:

10.1155/2013/720589

BORIS DOI:

10.7892/boris.42691

URI:

https://boris.unibe.ch/id/eprint/42691

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