Preprints
https://doi.org/10.5194/egusphere-2022-209
https://doi.org/10.5194/egusphere-2022-209
 
04 May 2022
04 May 2022
Status: this preprint is open for discussion.

Relationship between the stocks of carbon in non-cultivated trees and soils in a West-African forest-savanna transition zone

Tegawende Léa Jeanne Ilboudo1,6, Lucien NGuessan Diby2, Delwendé Innocent Kiba3,6, Tor Gunnar Vågen4, Leigh Ann Winowiecki4, Hassan Bismarck Nacro1, Johan Six5, and Emmanuel Frossard6 Tegawende Léa Jeanne Ilboudo et al.
  • 1Sciences Naturelles et Agronomie, Université Nazi Boni, Bobo Dioulasso, 01 BP 1091 Bobo-Dioulasso 01, Burkina Faso
  • 2Institut National Polytechnique Félix HOUPHOUËT-BOIGNY (INP-HB), Ecole Supérieure d’Agronomie (ESA), BP 1313 Yamoussoukro, Côte d’Ivoire
  • 3Centre National de la Recherche Scientifique et Technologique (CNRST), Institut de l’Environnement et de Recherches Agricoles (INERA), Laboratoire Ressources Naturelles et Innovations Agricoles (LARENIA), 01BP 476 Ouagadougou 01, Burkina Faso
  • 4World Agroforestry Centre (ICRAF), P.O. Box 30677-00100, Nairobi, Kenya
  • 5Group of Sustainable Agroecosystems, Swiss Federal Institute of Technology, Zurich, 8092 Zurich, Switzerland
  • 6Group of Plant Nutrition, Swiss Federal Institute of Technology, Zurich, 8315 Lindau, Switzerland

Abstract. Carbon is a key element for the functioning and productivity of tropical soils. While the impact of organic inputs on carbon storage in these soils is known, little is known about the contribution of non-cultivated trees.

In this study, we measured carbon content in non-cultivated trees (VC), soil organic carbon (SOC) and soil total nitrogen (TN) in different land uses in a West African forest – savanna transition zone. We used the Land Degradation Surveillance Framework for data collection and allometric equations to estimate the stocks of VC on a 10 km * 10 km landscape. Soil samples were taken in 160 sites at 0–20 cm, 20–50 cm, 50–80 cm and 80–110 cm depth in different land uses. We developed Partial Least Square regression models to predict SOC, TN and clay concentrations from mid-infrared soil spectra. We then considered soil bulk density to calculate the stocks of SOC and TN for each sampling depth and conducted a path analysis to identify the factors controlling these parameters. Our results showed that at landscape level, tree density and diversity explained most of VC stocks variability. SOC stock variability was mainly explained by clay content. The main drivers of TN stocks were clay and SOC stock. The VC and SOC stocks were not correlated with each other when considering all data. However, we found significant linear positive relationships between VC and SOC stocks for the land uses annual croplands, perennial croplands, grasslands and bushlands without soil depth restrictions until 110 cm. We concluded that in the forest-savanna transition zone, soil properties and topography determine land use, which in turn affects the stocks of SOC and TN and to some extent the VC stocks. Bushlands conservation and perennial trees cropping systems could be recommended for improved SOC storage.

Tegawende Léa Jeanne Ilboudo et al.

Status: open (until 15 Jun 2022)

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Tegawende Léa Jeanne Ilboudo et al.

Tegawende Léa Jeanne Ilboudo et al.

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Our results showed that at landscape level SOC stock variability was mainly explained by clay content. We found significant linear positive relationships between VC and SOC stocks for the land uses annual croplands, perennial croplands, grasslands and bushlands without soil depth restrictions until 110 cm. We concluded that in the forest-savanna transition zone, soil properties and topography determine land use, which in turn affects the stocks of SOC and TN and to some extent the VC stocks.