%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Thoumazeau, A.
%A Chevallier, Tiphaine
%A Baron, V.
%A Rakotondrazafy, N.
%A Panklang, P.
%A Marichal, R.
%A Kibblewhite, M.
%A Sebag, David
%A Tivet, F.
%A Bessou, C.
%A Gay, F.
%A Brauman, Alain
%T A new in-field indicator to assess the impact of land management on soil carbon dynamics
%D 2020
%L fdi:010079400
%G ENG
%J Geoderma
%@ 0016-7061
%K In-field indicator ; Soil carbon dynamics ; Land management ; Tropical conditions ; POXC ; SituResp (R)
%K THAILANDE ; CAMBODGE ; INDONESIE ; CHACHOENGSAO ; KHON KAEN ; BOS KHNOR ; SUMATRA ILE ; RIAU PROVINCE
%M ISI:000551513100003
%P art. 114496 [10 ]
%R 10.1016/j.geoderma.2020.114496
%U https://www.documentation.ird.fr/hor/fdi:010079400
%> https://www.documentation.ird.fr/intranet/publi/2020/08/010079400.pdf
%V 375
%W Horizon (IRD)
%X 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 (R) 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 (R) 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 (R) analysis showed that POXC-SituResp (R) indicator is negatively linked to excess of potentially mineralizable labile carbon. Carbon pools targeted by the POXC were specified by Rock-Eval (R) 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.
%$ 068 ; 076 ; 020