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Landscape-scale assessments of stable carbon isotopes in soil under diverse vegetation classes in East Africa : application of near-infrared spectroscopy

(2017) PLANT AND SOIL. 421(1-2). p.259-272
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Abstract
Stable carbon isotopes are important tracers used to understand ecological food web processes and vegetation shifts over time. However, gaps exist in understanding soil and plant processes that influence delta C-13 values, particularly across smallholder farming systems in sub-Saharan Africa. This study aimed to develop predictive models for delta C-13 values in soil using near infrared spectroscopy (NIRS) to increase overall sample size. In addition, this study aimed to assess the delta C-13 values between five vegetation classes. The Land Degradation Surveillance Framework (LDSF) was used to collect a stratified random set of soil samples and to classify vegetation. A total of 154 topsoil and 186 subsoil samples were collected and analyzed using NIRS, organic carbon (OC) and stable carbon isotopes. Forested plots had the most negative average delta C-13 values, -26.1aEuro degrees; followed by woodland, -21.9aEuro degrees; cropland, -19.0aEuro degrees; shrubland, -16.5aEuro degrees; and grassland, -13.9aEuro degrees. Prediction models were developed for delta C-13 using partial least squares (PLS) regression and random forest (RF) models. Model performance was acceptable and similar with both models. The root mean square error of prediction (RMSEP) values for the three independent validation runs for delta C-13 using PLS ranged from 1.91 to 2.03 compared to 1.52 to 1.98 using RF. This model performance indicates that NIR can be used to predict delta C-13 in soil, which will allow for landscape-scale assessments to better understand carbon dynamics.
Keywords
DIFFUSE-REFLECTANCE SPECTROSCOPY, ORGANIC-MATTER, DELTA-C-13 VALUES, NIR, SPECTROSCOPY, FOOD SECURITY, LAND-COVER, DELTA-N-15, FERTILITY, DYNAMICS, TANZANIA, Carbon cycling, Landscape scale assessments, Random forest modeling

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Citation

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Chicago
Winowiecki, Leigh Ann, Tor-Gunnar Vagen, Pascal Boeckx, and Jennifer AJ Dungait. 2017. “Landscape-scale Assessments of Stable Carbon Isotopes in Soil Under Diverse Vegetation Classes in East Africa : Application of Near-infrared Spectroscopy.” Plant and Soil 421 (1-2): 259–272.
APA
Winowiecki, L. A., Vagen, T.-G., Boeckx, P., & Dungait, J. A. (2017). Landscape-scale assessments of stable carbon isotopes in soil under diverse vegetation classes in East Africa : application of near-infrared spectroscopy. PLANT AND SOIL, 421(1-2), 259–272.
Vancouver
1.
Winowiecki LA, Vagen T-G, Boeckx P, Dungait JA. Landscape-scale assessments of stable carbon isotopes in soil under diverse vegetation classes in East Africa : application of near-infrared spectroscopy. PLANT AND SOIL. 2017;421(1-2):259–72.
MLA
Winowiecki, Leigh Ann, Tor-Gunnar Vagen, Pascal Boeckx, et al. “Landscape-scale Assessments of Stable Carbon Isotopes in Soil Under Diverse Vegetation Classes in East Africa : Application of Near-infrared Spectroscopy.” PLANT AND SOIL 421.1-2 (2017): 259–272. Print.
@article{8547727,
  abstract     = {Stable carbon isotopes are important tracers used to understand ecological food web processes and vegetation shifts over time. However, gaps exist in understanding soil and plant processes that influence delta C-13 values, particularly across smallholder farming systems in sub-Saharan Africa. This study aimed to develop predictive models for delta C-13 values in soil using near infrared spectroscopy (NIRS) to increase overall sample size. In addition, this study aimed to assess the delta C-13 values between five vegetation classes. 
The Land Degradation Surveillance Framework (LDSF) was used to collect a stratified random set of soil samples and to classify vegetation. A total of 154 topsoil and 186 subsoil samples were collected and analyzed using NIRS, organic carbon (OC) and stable carbon isotopes. 
Forested plots had the most negative average delta C-13 values, -26.1aEuro degrees; followed by woodland, -21.9aEuro degrees; cropland, -19.0aEuro degrees; shrubland, -16.5aEuro degrees; and grassland, -13.9aEuro degrees. Prediction models were developed for delta C-13 using partial least squares (PLS) regression and random forest (RF) models. Model performance was acceptable and similar with both models. The root mean square error of prediction (RMSEP) values for the three independent validation runs for delta C-13 using PLS ranged from 1.91 to 2.03 compared to 1.52 to 1.98 using RF. 
This model performance indicates that NIR can be used to predict delta C-13 in soil, which will allow for landscape-scale assessments to better understand carbon dynamics.},
  author       = {Winowiecki, Leigh Ann and Vagen, Tor-Gunnar and Boeckx, Pascal and Dungait, Jennifer AJ},
  issn         = {0032-079X},
  journal      = {PLANT AND SOIL},
  keyword      = {DIFFUSE-REFLECTANCE SPECTROSCOPY,ORGANIC-MATTER,DELTA-C-13 VALUES,NIR,SPECTROSCOPY,FOOD SECURITY,LAND-COVER,DELTA-N-15,FERTILITY,DYNAMICS,TANZANIA,Carbon cycling,Landscape scale assessments,Random forest modeling},
  language     = {eng},
  number       = {1-2},
  pages        = {259--272},
  title        = {Landscape-scale assessments of stable carbon isotopes in soil under diverse vegetation classes in East Africa : application of near-infrared spectroscopy},
  url          = {http://dx.doi.org/10.1007/s11104-017-3418-3},
  volume       = {421},
  year         = {2017},
}

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