The purpose of this study was to evaluate soil organic carbon, nitrogen stocks and physico-chemical soil parameters in eight provinces, various land use/ land cover systems and soils type in Gabon. 701 data of physico-chemical properties (particules size distributions, organic and nitrogen contents, C/N ratio and pH-water) of arable soil layers (0‐30 cm) were collected from the ORSTOM’s (Office de la Recherche Scientifique et Technique d’Outre-Mer) reports resulting from a sampling campaign in 8 out of the 9 provinces of Gabon 40 years ago. We compared soil pH, texture, bulk density, SOM contents and SOC and SON stocks in eight provinces under forests (primary and secondary) savannahs (herbaceous and shrubs) and under cropland and fallow forests and in main soils type Soil bulk density ranged between 0.9 (G7) and 1.2 g.cm³ (G1) and was significantly lower in G2, G4 and G9. Soils were acidic and no significant difference in soil pH among provinces were observed. However, soils under forest was more acidic than in savannahs. The soil textural show predominance of sand and clay and there was no difference in soil texture.

According to soil type, SOC stocks were 5.5 kgC.m², 17.3 kgC.m², 18.7 kgC.m², 21.8 kgC.m², 22.3 kgC.m⁻², 26.0 kgC.m^‐2 and 27.8 kgC.m² respectively in leached ferralitic soil, rejuvaneted ferralitic, lithic rough ferralitic, indured yellow ferralitic, hydromorphic soil, reworked soil and modal in ferralitic soil. SON stocks were higher in hydromorphic ferralitic soils (1.9 kgN.m⁻²) and reworked ferralitic soil (1.8 kgN.m²) compared to others type soil.

SOC and SON stocks were lower in center (14.2 kgC.m² and 1.4 kgN.m² in G3) and southern (16.1 kgC.m² and 1.4 kgN.m² in G5) of Gabon. Under various land uses system, SOC and SON were higher in cropland (27.0 kgC.m² and 2.8 kgN.m²) compared to forests and savannahs, suggesting that burning forest did not affect SOC and SON stocks in different provinces.

这项研究的目的是评估加蓬的八个省的土壤有机碳，氮储量和理化土壤参数，各种土地利用/土地覆盖系统和土壤类型。从ORSTOM（Office de la Recherche Scientifique et Technology d）收集了701个可耕土壤层（0-30 cm）的理化特性数据（颗粒大小分布，有机和氮含量，C / N比和pH-水）。 《 Outre-Mer》报告是40年前在加蓬9个省中的8个省进行采样活动的结果。我们比较了森林（原始和次生）大草原（草皮和灌木），农田和休耕林下以及主要土壤类型中八个省份的土壤pH，质地，容重，SOM含量以及SOC和SON储量（G7）和1.2 g.cm ³（G1），而在G2，G4和G9中则显着降低。土壤是酸性的，各省之间的土壤pH值没有显着差异。但是，森林下的土壤比大草原上的土壤酸性更高。土壤质地显示出砂和粘土占优势，土壤质地没有差异。

根据土壤类型，SOC股5.5 kgC.m ²，17.3 kgC.m ²，18.7 kgC.m ²，21.8 kgC.m ²，22.3 kgC.m ^-2，26.0 kgC.m ^-2和27.8 kgC.m在浸出的铁素体土壤中分别有^2个，在再生的铁素体土壤中，重生的铁素体，石质粗糙的铁素体，导致的黄色铁素体，水溶性土壤，返工的土壤和在铁素体土壤中的模态。与其他类型的土壤相比，在水状铁素体土壤（1.9 kgN.m ^-2）和返工的铁素体土壤（1.8 kgN.m ²）中，SON的含量更高。

加蓬的中部（G3中为14.2 kgC.m ²和1.4 kgN.m ²）和南部（G5中为16.1 kgC.m ²和1.4 kgN.m ²）的SOC和SON存量较低。在各种土地利用系统下，耕地的SOC和SON均高于森林和大草原，分别为27.0 kgC.m ²和2.8 kgN.m ²，这表明燃烧的森林不会影响不同省份的SOC和SON储量。