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A new in-field indicator to assess the impact of land management on soil carbon dynamics

Abstract : The assessment of the impacts of land-use and management on soil organic carbon (SOC) dynamics is a major environmental concern, as the soil carbon cycle underpins key ecosystem services. However, assessments based on short-term SOC dynamics face methodological and experimental difficulties. Hurisso et al. (2016) proposed a method to assess SOC dynamics by coupling two methods: Permanganate Oxidizable Carbon (POXC) and Basal Soil Respiration (BSR). This method has been used in laboratory on dried and re-wetted soil samples from temperate regions mainly. In our study, we adapted this method to the field and proposed a cost-effective in-field indicator combining the POXC and in situ Basal Soil Respiration (SituResp® method). We tested the indicator at four study sites (n = 169 points) within various tropical land-use and management contexts based on rubber, soybean and oil palm cropping systems respectively in Thailand, Cambodia and Indonesia. The results demonstrated the relevance, sensitivity and robustness of the POXC-SituResp® indicator to characterize the impact of a gradient of disturbance on SOC dynamics. The results also highlighted the potential of conservation agriculture (no-tillage and crops residues) and compost amendments to accumulate SOC. Rock-Eval® analysis showed that POXC-SituResp® indicator is negatively linked to excess of potentially mineralizable labile carbon. Carbon pools targeted by the POXC were specified by Rock-Eval® pyrolysis measurements to be a rather thermal resistant pool of SOC. Our study confirms that the integrated indicator based on POXC and BSR assess a relative carbon stabilization of SOC pools. This indicator can be measured in the field by a rapid and cost-effective method.
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https://hal.inrae.fr/hal-02891616
Déposant : Dominique Fournier <>
Soumis le : mardi 7 juillet 2020 - 08:47:42
Dernière modification le : mercredi 16 septembre 2020 - 14:36:13

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Alexis Thoumazeau, Tiphaine Chevallier, Victor Baron, Nancy Rakotondrazafy, Phantip Panklang, et al.. A new in-field indicator to assess the impact of land management on soil carbon dynamics. Geoderma, Elsevier, 2020, 375, pp.114496. ⟨10.1016/j.geoderma.2020.114496⟩. ⟨hal-02891616⟩

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