Size fractions of organic matter pools influence their stability: Application of the Rock-Eval® analysis to beech forest soils  

作　　者：David SEBAG Eric P.VERRECCHIA Thierry ADATTE Michael AUBERT Guillaume CAILLEAU Thibaud DECAENS Isabelle KOWALEWSKI Jean TRAP Fabrice BUREAU Mickael HEDDE 

机构地区：[1]Normandie Univ,Universitéde Rouen Normandie(UNIROUEN),Centre National de la Recherche Scientifique(CNRS),M2C,Rouen 76000,France [2]Institute of Earth Surface Dynamics(IDYST),Geopolis,University of Lausanne,Lausanne 1015,Switzerland [3]Institut Français du Pétrole Energies Nouvelles(IFPEN),Earth Sciences and Environmental Technologies Division,Rueil-Malmaison 92852,France [4]Institute of Earth Sciences(ISTE),Geopolis,University of Lausanne,Lausanne 1015,Switzerland [5]Normandie Univ,Universitéde Rouen Normandie(UNIROUEN),Institut National de Recherche pour l'Agriculture,l'Alimentation et l'Environnement(INRAE),LaboratoireÉtude et COmpréhension de la bioDIVersité(ECODIV),Rouen 76000,France [6]Laboratory of Microbiology,Institute of Biology,University of Neuchâtel,Neuchâtel 2000,Switzerland [7]Centre d'Ecologie Fonctionnelle et Evolutive(CEFE),Universitéde Montpellier,CNRS,Ecole Pratique des Hautes Etudes(EPHE),Institut de Recherche pour le Développement(IRD),Montpellier 34000,France [8]Eco&Sols,INRAE,IRD,Universitéde Montpellier,Montpellier 34000,France

出　　处：《Pedosphere》2022年第4期565-575,共11页土壤圈（英文版）

摘　　要：Soil organic matter (SOM) is a complex heterogeneous mixture formed through decomposition and organo-mineral interactions, and characterization of its composition and biogeochemical stability is challenging. From this perspective, Rock-Eval® is a rapid and efficient thermal analytical method that combines the quantitative and qualitative information of SOM, including several parameters related to thermal stability. This approach has already been used to monitor changes in organic matter (OM) properties at the landscape, cropland, and soil profile scales. This study was aimed to assess the stability of SOM pools by characterizing the grain size fractions from forest litters and topsoils using Rock-Eval® thermal analysis. Litter (organic) and topsoil samples were collected from a beech forest in Normandy (France), whose management in the last 200 years has been documented. Fractionation by wet sieving was used to separate large debris (> 2 000 μm) and coarse (200–2 000 μm) and fine particulate OM (POM) (50–200 μm) in the organic samples as well as coarse (200–2 000 μm), medium (50–200 μm), and fine (< 50 μm) fractions of the topsoil samples. Rock-Eval® was able to provide thermal parameters sensitive enough to study fine-scale soil processes. In the organic layers, quantitative and qualitative changes were explained by the progressive decomposition of labile organic compounds from plant debris to the finest organic particles. Meanwhile, the grain size fractions of topsoils presented different characteristics. The coarse organo-mineral fractions showed higher C contents, albeit with a different composition, higher thermal stability, and greater decomposition degree than the plant debris forming the organic layer. These results are consistent with those of previous studies that microbial activity is more effective in this fraction. The finest fractions of topsoils showed low C contents, the highest thermal stability, and low decomposition degree, which can be explained by the stronger interactions wi

关 键 词：aggregate decomposition litter organo-mineral interaction plant-microbe-soil continuum soil organic matter thermal analysis TOPSOIL 

分 类 号：S714[农业科学—林学]