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    Plan

    Plan détaillé Texte intégral Two forms of carbon in Mediterranean soils How soil organic carbon benefits soil fertility and the environment Measuring or evaluating SOC after changes in management practices Carbon stock within the soil profile: the importance of deep carbon The vulnerability of soil carbon Conclusion Bibliographie Auteurs

    The Mediterranean region under climate change

    Ce livre est recensé par

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    Table des matières

    Sub-chapter 3.5.3. Soil carbon as an indicator of Mediterranean soil quality

    Tiphaine Chevallier, Salwa Hamdi, Tahar Gallali, Nadhem Brahim, Rémi Cardinael, Zohra Bounouara, Laurent Cournac, Claire Chenu et Martial Bernoux

    p. 627-636

    Texte intégral Bibliographie References Auteurs

    Texte intégral

    Two forms of carbon in Mediterranean soils

    1Soils are considered as one of the largest C pools on Earth, after the oceanic and geologic reservoirs. The soil C pool comprises two distinct components: soil organic carbon (SOC) and soil inorganic carbon (SIC), which roughly contribute 2/3 and 1/3, respectively (Batjes, 1996).

    2Soil organic carbon (SOC) represents about 50% of soil organic matter, by consequence “soil organic matter” and “soil organic carbon” are often confused and used interchangeably. Soil organic matter corresponds to all organic materials in soil, i.e. any material produced originally by living organisms (plant, animal, microorganisms) at various stages of decomposition. Soil organic matter is a continuum of simple and complex molecules. It constitutes a dynamic soil carbon pool, regularly fed by organic residues and in interaction with the mineral particles of the soil. Soil organic matter influences soil functions and properties. It has a key/role in the overall behaviour of soils and agroecosystems, as it provides energy for soil microorganisms, nutrient storage and supply (nitrogen, phosphorus and potassium) for plant production, improves soil structure and is thus involved in the ability of soil to hold water and resist erosion. Maintaining organic carbon in soil is equivalent to maintaining the soil organic matter and a part of the soil fertility. By consequence soil organic carbon content is often considered to be the prime soil quality indicator, with respect to its agricultural and environmental functions.

    Table 1. Estimated dryland carbon stocks

    Image

    Source: Millennium Ecosystem Assessment, 2005 (dryland chapter)

    3Soil inorganic carbon (SIC) represents different C forms involved in a solid-solution-gas phase equilibrium, as carbonate minerals (mainly CaCO3), as aqueous carbonic dioxide, bicarbonate HCO3- and carbonate CO32- ions in soil solution, and as a gas carbonic dioxide CO2. In humid regions, SIC tends to get dissolved and fluxes into the groundwater or precipitates deep in the soil or geologic system, whereas in dry regions it precipitates at relatively shallow depths as a result of sparse rainfall and insufficient leaching (Gocke et al. 2011). Because of this, about 90% of the global SIC pool is found in arid and semiarid regions (Eswaran et al. 2000), such as the Mediterranean region. Despite agreement about its large size as a carbon pool (950 Gt), little attention has been paid to the dynamic of the SIC pool, which is considered to be very slow and less influenced by anthropogenic disturbance than the SOC pool. However, there is increasing evidence that the solid-solution-gas phase equilibrium in the SIC system may be shifted in one way or another (to CO2 emissions or CaCO3 precipitation) by external factors such as management practices, e.g. cropping and irrigation, and human-led environmental changes.

    4The dynamics of the SIC pool could be impacted by land management. Indeed, irrigation to enhance crop production in the Mediterranean region is often practiced with groundwater laden with dissolved calcium bicarbonate (Ca2 + and HCO3-). When used for irrigation, this water promotes calcium precipitation in the form of calcium carbonate and could modify the equilibrium between the different forms of inorganic carbon in soil. The addition of plant residues enhances biological activities (root and microorganism respiration) resulting in an increase in CO2 partial pressure, which may either lead to an enhanced trapping of CO2 through carbonate precipitation, or to a decrease in soil pH resulting in the dissolution of carbonates. There are very few studies that try to understand and explain the contradiction between the results of the impact of soil management on SIC dynamics (Monger et al. 2015). More research is needed on that specific issue.

    How soil organic carbon benefits soil fertility and the environment

    5In semi-arid regions, improving water management while avoiding loss of soil organic matter, and thus maintaining the soil organic carbon pool, is essential to preserve soil against degradation and ensure food security for societies. Combating soil desertification requires effective organic matter and water management in order to maintain a sufficient level of fertility for sustainable production. Thus, the techniques for water and soil conservation management are also recognized as effective soil organic carbon management techniques. Water conservation and fertile sediment retention enhances soil fertility and facilitates the growth of natural or replanted vegetation around the structures as half-moon or stone bunds.

    6Soil carbon is linked to soil organic matter, as 50% of soil organic matter is soil organic carbon. Soil organic matter ensures a part of soil fertility as it allows for storage of nutriments for plant growth, stimulates soil biodiversity and contributes to soil structure stability. Maintaining the soil organic matter pool is essential in sustainable land management and soil productivity (fig 1).

    7Besides soil fertility, soil organic matter is also seen as the biggest C reservoir of terrestrial ecosystems after carbon fossil stock (see fig 2). Storing C in soil is seen as a means to mitigate atmospheric CO2 concentration and Green House Gas emissions (GHG emissions, fig. 1). Thus C balance from soil to the atmosphere is a local issue for soil conservation, agricultural production and food security and at the same time a global issue to limit climatic change. Soil carbon is recognized as an indicator of soil quality in terms of its agricultural and environmental functions.

    Image

    Figure 1
    The vicious circle between the decrease in soil organic pools, land degradation and food insecurity (from Lal, 2004: Soil carbon sequestration impacts on global climate change and food security. Nature 304(5677): 1623-1627).

    Measuring or evaluating SOC after changes in management practices

    8Most Mediterranean soils exhibit low (≤2%) or very low (≤1%) SOC content especially in the southern side of the Mediterranean sea, with a mean SOC content of about 1.1% in the top 0-30 cm for the North Africa region and national means of SOC ranging from 0.67 to 0.79% for Morocco, Tunisia, Algeria and Egypt (Henry et al. 2009). Limited SOC content in the Mediterranean soils is mainly the result of a limited net primary productivity. These low C inputs driven by limited soil moisture availability could be exacerbated by crop residue competition for livestock feeding or the introduction of long fallowing in the crop rotation. Besides low C inputs to the soil, some agricultural management, such as intensive deep-tillage (e.g. moldboard ploughing) may also boost SOC losses. Deep-tillage enhances microbial activity by homogenization of soil moisture and oxygenation and incorporation of crop residues into deep soil, and thus speeds up soil organic matter mineralization and loss. Farming practices that enhance carbon storage are needed for sustainable land management, soil productivity and protection of the environment.

    9Many soil and management techniques have long been known to maintain or enhance the soil organic matter content: use of compost, manure, cropping residues to “feed” the soil: soil cover techniques, grassed strip, trees, or any land management that preserves soil from erosion, improves water infiltration and enhances soil fertility. To evaluate the efficiency of these techniques to restore, maintain or enhance the soil organic carbon stock, scientists and stakeholders need to quantify soil carbon stocks.

    Image

    Figure 2
    Human activity CO2 emissions against C stocks, expressed in Gt C or in billions of tonnes of C, and fluxes, expressed in Gt C yr-1, between ecosystems and atmosphere (mean values for 2004-2013, Le Quéré et al. 2014, Earth Syst. Sci. Data Discuss., 6, 1–90, 2014).

    10Countries should regularly provide national inventories of greenhouse gas emissions and potential sinks of C for the agriculture and forestry sectors. This comprises national estimates of soil organic carbon (C) stocks (Box 1). These inventories require quantifying the soil carbon stocks on large territories where variability can be large. The development of new measurement techniques for C stock monitoring, that are faster and cheaper than classical techniques are needed (e.g. infrared-spectrometry). Models are also being developed to predict the impact of agriculture and forestry changes on C balances at large scale (region to country) (Box 2).

    Carbon stock within the soil profile: the importance of deep carbon

    11Most of soil carbon surveys focused on the first 30 centimeters of soil (0-30 cm). However, if measured only on the topsoil (0-30 cm), SOC stocks are not representative of the real stock of C stored in the soil, especially in the deep soils of the alluvial cultivated plains. The total carbon stock could be underestimated from 30 to 65% in Tunisia (Box 1) or on a toposequence in North Algeria (Bounouara et al. 2016) or up to 80% in Cardinael et al. 2015 (Box 3).

    Box 1
    A specific study “national soil carbon stocks, a case study in Tunisia”
    Assessment of carbon contents and carbon stocks in Mediterranean soils is often difficult. The first difficulty is encountered during the sampling process, due to the presence of stones in the soils. In addition to the low organic carbon content and its heterogeneous distribution, sampling representative samples could be hard. The second difficulty concerns the analysis. Most soil carbon measuring methods estimate the total soil carbon content (organic and inorganic carbon). The soil sample must be decarbonated when the analysis is focused only on organic carbon. This decarbonation procedure is difficult and expensive.
    In addition, estimation of soil C stocks requires soil bulk density values to convert C content (g C kg-1 soil) to a mass of C per unit area (tC ha-1). However, because it is labour-intensive, costly and tedious especially in rocky soil with a high coarse-element content, direct measurement of bulk density is often lacking for soils in arid and semi-arid conditions. Using a pedotransfert equation is an easy option to predict soil bulk density using data from soil surveys, e.g. soil texture or data easier to measure in the field. These predictive functions are specific to regional conditions and need to be built especially for the Mediterranean context (Brahim et al. 2012).
    Estimation of national SOC stocks could be conducted after predictive functions using different databases, e.g. soil maps or soil types. Globally the different estimations of SOC stocks for large areas gave similar results and identified the same regions with high SOC stocks. However, the local SOC variability was not precise enough and depends on the predictive function use (Brahim et al. 11). Brahim et al. (2011) organized a soil database with 238 soil profiles corresponding to 707 soil horizons. The mean and median SOC contents of top-soil were 1.17% and 0.86% respectively. The spatial variation of SOC contents are mainly explained by the climatic zones and the soil texture. The global SOC stocks in Tunisian soils are about 0.42-0.46 PgC (0-30 cm) and 1.03-1.13 PgC (0-1m) (Brahim et al. 2011).

    Box 2
    EX-Ante Carbon blance Tool (EX-ACT)
    Ex-Act is a tool developed by FAO in collaboration with IRD to perform ex-ante estimates of the impact of agriculture and forestry development projects on GHG emissions and carbon sequestration in soil and biomass. This tool is especially useful to evaluate the carbon impact of agricultural policies such as land use change incitation (i.e. deforestation, forestation, forest degradation, annual/perennial crops, irrigated rice, grasslands, livestock, inputs, energy, or other investments such as road or warehouse construction). Estimation of C balance is based on IPCC default values (Tier 1), region specific coefficients (Tier 2) are therefore needed to get more accurate C balance results.

    Box 3
    A specific study “Agroforestry in South of France”
    Agroforestry is a land use type where trees are associated with crops or pastures within the same field. In Southern France, a sub-humid Mediterranean region, a study evaluated the potential of organic carbon storage in soil and biomass under an 18 year-old agroforestry system with hybrid walnut trees at 110 trees ha-1 + durum wheat. The accumulation rates were 0.35 tC ha-1 yr-1 in the first meter of soil, and 0.75 tC ha-1 yr-1 in the above-ground tree biomass. The stored soil organic carbon was mostly coarse organic plant residues (particulate organic matter) which may be rather labile SOC fractions. This study demonstrated the potential of alley cropping systems to store SOC under Mediterranean conditions, but suggested that the additional SOC is vulnerable to any future land use change (Cardinael et al. 2015).

    12Different types of land uses or soil managements affect the stocks, dynamics and forms of SOC in topsoils but their effect on deep C is still unclear. Because SOC is considered to be less dynamic in subsoils than in topsoils, SOC in subsoils were not studied a lot. However, the SOC in deep soil can contribute to SOC stocks and also be a potential source of CO2. Indeed, some studies in Mediterranean regions showed that SOM could have high C and N mineralization rates even in subsoil. This surprising result was attributed to specific pedoclimatic constraints under Mediterranean soils (Rovira and Vallejo, 1997, 2002). Therefore, SOM characterization and dynamics in deep soil horizons under the Mediterranean pedoclimate was still unclear because of few available data. Its distribution in the landscape and its forms must be characterized in order to understand its dynamics.

    The vulnerability of soil carbon

    13Terrestrial ecosystems play a major role in regulating atmospheric CO2 concentrations, as the net balance of photosynthesis and respiration corresponds to a current terrestrial sink of about 2.6 Gt C yr-1. Soil respiration, including autotrophic respiration by roots and heterotrophic respiration by microorganisms, has been estimated to be approximately 100 GtC yr-1 (IPCC, 2007) with the half being produced by heterotrophic respiration. Thus it is essential to estimate and predict the impact of soil management and climate change on the microbial activities involved in SOC decomposition to predict the vulnerability or sensitivity of SOC stocks to climate change, i.e. increasing temperature, dry-wet cycles, and extreme events. Particular attention is currently paid to the effect of climate changes on Mediterranean region, where increased temperature, decreased and more concentrated rainfall, and an increased frequency of extreme events are forecast.

    14Understanding soil carbon dynamics is especially critical in semi-arid regions, such as North-West Tunisia, where SOC stocks are low and agricultural productivity is already limited by climatic conditions. A study for North West Tunisian soils indicated a moderate and positive response of soil respiration to temperature; Q 10 of soil respiration was evaluated to 1.7 (Hamdi et al. 2011). Q 10 is the proportional change in respiration with a 10 °C increase in temperature. This value of Q 10 was in the current Q 10 range values given in the literature, 2.6±1.2 (Hamdi et al. 2013). It seems that these Mediterranean soils have no specific behavior when temperature increases. However, maintaining soil at high temperature up to 40° C for one month, which could be possible in Tunisian semi-arid topsoils, decreases microbial biomass and substrate availability and consequently affects the temperature sensitivity of soil respiration.

    15In addition, it is not yet clear how and under what conditions the large inorganic carbon pool of Mediterranean soils may be affected by changing climatic conditions. Studies of the positive or negative effects of irrigation or rain events on the contribution of carbonates to the CO2 emissions from dryland soils are conflicting (Emmerich, 2003; Serrano-Ortiz et al. 2010). In addition, no study has considered the impact of soil temperature on CO2 emission from calcareous soils in drylands soil, where heat waves are expected to become more frequent and extreme within the 21st Century (IPCC, 2007). A better understanding of SIC dynamics and their role in ongoing global change is particularly critical for arid and semiarid areas, where SIC is the most important C form. In addition, certain methodological issues persist which add uncertainty to the investigation of CO2 fluxes from calcareous soils to the atmosphere (Chevallier et al. 2016).

    Conclusion

    16As the soil carbon content varies on multiannual scales, other indicators which are more sensitive to the soil organic status can be used for earlier detection of change trends. These indicators involve enzymes, microbial biomass or soil organism biodiversity. They are more sensitive to soil functioning changes but also more complicated to obtain and to use. Soil organic carbon content is thus recognized as one of the main indicators to monitor soil quality, for its agricultural and environmental functions by many national and international institutions, initiatives and partnerships (see sub-chapter 3.5.4). As soil C dynamics is poorly studied in Mediterranean context, more research is needed in order to evaluate the content and quality of soil carbon in relation to the quality of Mediterranean soils.

    Bibliographie

    Des DOI sont automatiquement ajoutés aux références bibliographiques par Bilbo, l’outil d’annotation bibliographique d’OpenEdition. Ces références bibliographiques peuvent être téléchargées dans les formats APA, Chicago et MLA.

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    Bounouara, Z., Chevallier, T., Balesdent, J., Toucet, J., Sbih, M., Bernoux, M., … Bensaid, R. (2017). Variation in soil carbon stocks with depth along a toposequence in a sub-humid climate in North Africa (Skikda, Algeria). Elsevier BV. https://doi.org/10.1016/j.jaridenv.2017.02.001
    Bounouara, Zohra, Tiphaine Chevallier, Jérôme Balesdent, Joele Toucet, Mahtali Sbih, Martial Bernoux, Noureddine Belaissaoui, Ouarda Bouneb, and Rabah Bensaid. “Variation in Soil Carbon Stocks With Depth Along a Toposequence in a Sub-Humid Climate in North Africa (Skikda, Algeria)”. Journal of Arid Environments. Elsevier BV, June 2017. doi:10.1016/j.jaridenv.2017.02.001.
    Bounouara, Zohra, et al. “Variation in Soil Carbon Stocks With Depth Along a Toposequence in a Sub-Humid Climate in North Africa (Skikda, Algeria)”. Journal of Arid Environments, vols. 141, Elsevier BV, June 2017, pp. 25-33. Crossref, https://doi.org/10.1016/j.jaridenv.2017.02.001.

    Cette bibliographie a été enrichie de toutes les références bibliographiques automatiquement générées par Bilbo en utilisant Crossref.

    References

    Batjes, N.H., 1996
    Total carbon and nitrogen in the soils of the world. European Journal of Soil Science 47, 151-163.

    Brahim, N., Gallali, T., Bernoux, M., 2011
    Carbon stock by soils and departments in Tunisia. Journal of Applied Sciences 11, 46-55.

    Brahim, N., Bernoux, M., Gallali, T., 2012
    Pedotransfer functions to estimate soil bulk density for Northern Africa: Tunisia case. Journal of Arid Environments 81, 77-83

    10.1016/j.jaridenv.2017.02.001 :

    Bounouara Z., Chevallier T., Balesdent, J., Toucet, J., Sbih M., Bernoux M., Belaaissaoui N., Bouneb O., Bebsaid R, submitted.
    Variation in soil carbon stocks with depth along a toposequence in a sub-humid climate in North Africa (Skikda, Algeria) in press in Journal of Arid Environment

    Cardinael, R., Chevallier, T., Barthès, B., Saby, NPA., Parent, T., Dupraz, C., Bernoux, M., Chenu, C., 2015
    Impact of alley cropping agroforestry on stocks, forms and spatial distribution of soil organic carbon-A case study in a Mediterranean context. Geoderma 259-260, 288-299.

    Chevallier T, Cournac L, Hamdi S, Gallali T, Bernoux M. 2016
    Temperature dependence of CO2 emissions rates and isotopic signature from a calcareous soil in Press in Journal of Arid Environment

    Emmerich, W.E., 2003
    Carbon dioxide fluxes in a semiarid environment with high carbonate soils. Agricultural and Forest Meteorology 116 91-102.

    Eswaran, H., Reich, P.F., Kimble, J.M., Beinroth, E., Padmanabhan, E., Moncharoen, P., 2000
    Global carbon stocks. In: al, R.L.e. (Ed.), Global Climate Change and Pedogenic Carbonate. Lewis/CRC Publishers, Boca Raton Fl, pp. 15-26.

    Gocke, M., Pustovoytov, K., Kuzyakov, Y., 2011
    Carbonate recrystallization in root-free soil and rhizosphere of Triticum aestivum and Lolium perenne estimated by C-14 labeling. Biogeochemistry 103, 209-222.

    Hamdi, S., Chevallier, T., Ben Aïssa, N., Ben Hammouda, M., Gallali, T., Chotte, J.L., Bernoux, M., 2011
    Short-term temperature dependence of heterotrophic soil respiration after one-month of pre-incubation at different temperatures. Soil Biology and Biochemistry 43, 1752-1758.

    Hamdi, S., Moyano, F., Sall, S.N., Bernoux, M., Chevallier, T., 2013
    Synthesis analysis of the temperature sensitivity of soil respiration from laboratory studies in relation to incubation methods and soil conditions. Soil Biology and Biochemistry 58, 115-126.

    Henry, M., Valentini, R., Bernoux, M., 2009
    Soil carbon stocks in ecoregions of Africa. Biogeosciences Discussions 6, 797-823.

    IPCC, 2007
    Climate Change 2007: the physical scientific basis. Contribution of working Group I to the fourth assessment report of the Intergovernmental Panel on Climate Change. Geneva, CH.

    Monger, H.C., Kraimer, R., Khresat, S., Cole, D., Wang, X., Wang, J., 2015
    Sequestration of inorganic carbon in soil and groundwater. Geology 43, 375-378.

    Rovira, P., Vallejo, V.R., 1997
    Organic carbon and nitrogen mineralization under mediterranean climatic conditions: the effects on incubation depth. Soil Biology & Biochemistry 29, 1509-1520.

    Rovira, P., Vallejo, V.R., 2002
    Labile and recalcitrant pools of carbon and nitrogen in organic matter decomposing at different depths in soil: an acid hydrolysis approach. Geoderma 107, 109-141.

    Serrano-ortiz, P., Roland, M., Sanchez-Moral, S., Janssens, I.A., Domingo, F., Goddéris, Y., Kowalski, A.S., 2010
    Hidden, abiotic CO2 flows and gaseous reservoirs in the terrestrial carbon cycle: Review and perspectives. Agricultural and Forest Meteorology 150, 321-329.

    Auteurs

    • Tiphaine Chevallier

      IRD, France
      Agro-soil scientist, Institut de Recherche pour le Développement (IRD), France
      tiphaine.chevallier@ird.fr

    • Salwa Hamdi

      Faculty of Sciences of Tunis, Tunisia
      Soil scientist
      in memoriam

    • Tahar Gallali

      Faculty of Sciences of Tunis, Tunisia
      Soilscientist, Faculté des Sciences de Tunis, Tunisia
      gallali.tahar@planet.tn

    • Nadhem Brahim

      Faculty of Sciences of Tunis, Tunisia
      Soil scientist, Faculté des Sciences de Tunis, Tunisia
      nadhem.brahim@gmail.com

    • Rémi Cardinael

      CIRAD, France
      Agro-soil scientist, Centre International de Recherche Agronomique pour le Développement (CIRAD) France
      remi.cardinael@cirad.fr

    • Zohra Bounouara

      University of Skikda, Algeria
      Agro-soil scientist, Université de Skikda, Algeria
      bounouarazohra@gmail.com

    • Laurent Cournac

      IRD, Sénégal
      Ecophysiologist - agro-ecologist, Institut de Recherche pour le Développement (IRD), France
      laurent.cournac@ird.fr

    • Claire Chenu

      AgropParisTech, France
      Soil scientist, AgroParisTech, France
      chenu@agroparistech.fr

    • Martial Bernoux

      IRD, France
      Soil scientist, Institut de Recherche pour le Développement (IRD), France
      martial.bernoux@ird.fr

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    Introduction

    Usages des sols et stocks de carbone en Afrique

    Tiphaine Chevallier, Lydie Chapuis-Lardy, Martial Bernoux et al.

    Conclusion

    Action commune de Koronivia : pour une prise en compte des enjeux agricoles et environnementaux africains

    Tiphaine Chevallier, Tantely M. Razafimbelo, Lydie Chapuis-Lardy et al.

    Chapitre 1. Les stocks de carbone des sols d’Afrique de l’Ouest

    Matieu Henry, Mahamadou Belem, Rémi d’Annunzio et al.

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    The Mediterranean region under climate change

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    The Mediterranean region under climate change

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    The Mediterranean region under climate change

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    Chevallier, T., Hamdi, S., Gallali, T., Brahim, N., Cardinael, R., Bounouara, Z., … Bernoux, M. (2016). Sub-chapter 3.5.3. Soil carbon as an indicator of Mediterranean soil quality. In J.-P. Moatti & S. Thiébault (éds.), The Mediterranean region under climate change. Marseille: IRD Éditions. https://doi.org/10.4000/books.irdeditions.24018
    Chevallier, Tiphaine, Salwa Hamdi, Tahar Gallali, Nadhem Brahim, Rémi Cardinael, Zohra Bounouara, Laurent Cournac, Claire Chenu, et Martial Bernoux. « Sub-Chapter 3.5.3. Soil Carbon As an Indicator of Mediterranean Soil Quality ». In The Mediterranean Region under Climate Change, édité par Jean-Paul Moatti et Stéphane Thiébault. Marseille: IRD Éditions, 2016. doi:10.4000/books.irdeditions.24018.
    Chevallier, Tiphaine, et al. « Sub-Chapter 3.5.3. Soil Carbon As an Indicator of Mediterranean Soil Quality ». The Mediterranean Region under Climate Change, édité par Jean-Paul Moatti et Stéphane Thiébault, IRD Éditions, 2016, https://doi.org/10.4000/books.irdeditions.24018.

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    Moatti, J.-P., & Thiébault, S. (éds.). (2016). The Mediterranean region under climate change. Marseille: IRD Éditions. https://doi.org/10.4000/books.irdeditions.22908
    Moatti, Jean-Paul, et Stéphane Thiébault, éd. The Mediterranean Region under Climate Change. Marseille: IRD Éditions, 2016. doi:10.4000/books.irdeditions.22908.
    Moatti, Jean-Paul, et Stéphane Thiébault, éditeurs. The Mediterranean Region under Climate Change. IRD Éditions, 2016, https://doi.org/10.4000/books.irdeditions.22908.
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