Abstract. Researches carried out on soil organic carbon stock (SOCS) in the Sudano-Sahelian part of Cameroon are very rare. The few existing ones are mostly available in reports and concern in most cases carbon stocks in plant biomass. In order to contribute to the documentation on soils in this part of the country, the present work was designed to evaluate the SOCS in the main soil types and the influence of environmental factors and soil properties on these stocks under the natural dry tropical area of the Sudano-Sahelian zone of Cameroon. The study was undertaken in four sites, including three natural forest reserves (Laf, Zamai, Kosohon) and one national park (Mozogo), located at different latitudes. Two replications were thereafter made, thus, giving rise to three sampling points chosen per site, from 0 to 75 cm depth, for the determination of the SOCS. At each sampling point, soils were sampled using depth increments of 25 cm from the surface. The studied area is covered by Haplic Vertisols, Dystric Arenosols, Dystric Leptosols and Dystric Planosols. T-SOCS content, which refers to a depth of 75 cm, decreases with increasing latitude, with 249±26.26 Mg.ha^-1 in Vertisols at Laf forest reserve in the low latitude, 199±8.00 Mg.ha^-1 in Arenosols at Zamai forest reserve, 166±16.63 Mg.ha^-1 in Leptosols at Kosohon forest reserve and 161±8.88 Mg.ha^-1 in Planosols at Mozogo national park in the high latitude, regardless of the altitude. No significant correlation was noted between T-SOCS and the altitude. A good correlation was noted between precipitation which decreases with increasing latitude and T-SOCS, indicating the importance of climate in the distribution of T-SOCS in the study area, which directly influence the productivity of the vegetation. More than 60% of the SOCS was stored below the first 25 cm from the soil surface, a peculiarity of SOCS in the drylands. The SOCS in the Sudano-Sahelian area of Cameroon is mainly influenced by climate and vegetation.

中文翻译：

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环境因素和土壤性质对喀麦隆自然干旱热带地区土壤有机碳储量的影响

摘要。对喀麦隆苏达诺-萨赫勒地区的土壤有机碳储量（SOCS）的研究非常少。现有的少数几个在报告中大部分可用，并且在大多数情况下与植物生物量中的碳储存有关。为了有助于该国该地区土壤的文献记录，本工作旨在评估主要土壤类型中的SOCS，以及在该国自然干燥热带地区下环境因素和土壤特性对这些种群的影响。喀麦隆的苏达诺-萨赫勒地区。这项研究是在四个地点进行的，其中包括三个自然森林保护区（拉夫，扎迈，科索洪）和一个位于不同纬度的国家公园（莫佐戈）。此后进行了两次复制，因此，每个位点选择了三个采样点，深度从0到75厘米，确定SOCS。在每个采样点，使用距地面25 cm的深度增量对土壤进行采样。所研究的区域覆盖有Haplic Vertisols，Dystric槟榔，Dystric扁豆溶胶和Dystric Planosols。T-SOCS含量（指的是75厘米的深度）随着纬度的增加而降低，为249±26.26 Mg.ha^-1在变性土在低纬度LAF森林储量，199±8.00 Mg.ha ^-1在Zamai森林保护红砂土，166±16.63 Mg.ha ^-1在Leptosols在Kosohon森林储量和161±8.88 Mg.ha ^{- 1个}不论海拔高度如何，都可以在高纬度Mozogo国家公园的Planosols中找到。T-SOCS与海拔高度之间没有显着相关性。随纬度增加而减少的降水与T-SOCS之间存在良好的相关性，表明气候对研究区域T-SOCS分布的重要性，这直接影响植被的生产力。超过60％的SOCS储存在距土壤表面前25 cm的下方，这是干旱地区SOCS的独特之处。喀麦隆Sudano-Sahelian地区的SOCS主要受气候和植被的影响。