The deforestation of tropical forests plays a key role in terms of carbon dioxide emissions and thus accelerates climate change. With the initiative Reducing Emissions from Deforestation and Forest Degradation (REDD+), the UN spearheaded an approach to valorize ecosystems for their sequestered organic carbon (OC) to protect them for the sake of mitigating global climate change. In Brazil, where large areas of intact forests abound, especially within the territories of indigenous people, REDD+ schemes are highly sought after but are often hard to establish due to the given uncertainties in carbon stock evaluation at greater soil depths, intercultural communication problems and power asymmetries. With permission from the Kayapo/Mekragnoti tribe, our interdisciplinary research team dug a 10.0 m soil profile under a pristine forest situated on their indigenous territory in Pará, Brazil. Our results show that by following the Land Use, Land Use Change and Forestry (LULUCF) guidelines of the United Nations Framework Convention on Climate Change (UNFCCC), focusing on the first 0.3 m of soil only captures 21 % of the total soil OC present. Furthermore, only 51 % of soil OC was stored in the first metre, while 84 % of OC was captured if the sampling depth expanded to 3.0 m. This study notes that for adequate calculation and validation of stored soil OC, at least one real measurement (i.e., the Tier 3 approach) is needed to represent OC stocks in the subsoil.

中文翻译：

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深入挖掘：深层土壤碳对亚马逊热带森林社区潜在 REDD+ 项目的价值

热带森林的砍伐在二氧化碳排放方面起着关键作用，从而加速了气候变化。通过减少森林砍伐和森林退化所致排放量 (REDD+) 倡议，联合国率先采取了一种方法，为生态系统的固存有机碳 (OC) 增值，以保护它们，从而缓解全球气候变化。在巴西，大面积的完整森林比比皆是，尤其是在土著人民的领土内，REDD+ 计划备受追捧，但由于土壤深度更大的碳储量评估存在不确定性、跨文化交流问题和权力，因此通常很难建立不对称。在 Kayapo/Mekragnoti 部落的许可下，我们的跨学科研究团队挖出了 10 个。位于巴西帕拉土著领地的原始森林下的 0 米土壤剖面。我们的结果表明，通过遵循联合国气候变化框架公约 (UNFCCC) 的土地利用、土地利用变化和林业 (LULUCF) 指南，关注前 0.3 m 的土壤仅捕获了当前土壤有机碳总量的 21% . 此外，只有 51% 的土壤有机碳储存在第一米，而如果采样深度扩大到 3.0 m，则捕获了 84% 的有机碳。本研究指出，为了充分计算和验证存储的土壤 OC，至少需要一种实际测量（即方法 3）来表示底土中的 OC 库。联合国气候变化框架公约 (UNFCCC) 的土地利用变化和林业 (LULUCF) 指南，侧重于前 0.3 m 的土壤仅捕获现有土壤有机碳总量的 21%。此外，只有 51% 的土壤有机碳储存在第一米，而如果采样深度扩大到 3.0 m，则捕获了 84% 的有机碳。本研究指出，为了充分计算和验证存储的土壤 OC，至少需要一种实际测量（即方法 3）来表示底土中的 OC 库。联合国气候变化框架公约 (UNFCCC) 的土地利用变化和林业 (LULUCF) 指南，侧重于前 0.3 m 的土壤仅捕获现有土壤有机碳总量的 21%。此外，只有 51% 的土壤有机碳储存在第一米，而如果采样深度扩大到 3.0 m，则捕获了 84% 的有机碳。本研究指出，为了充分计算和验证存储的土壤 OC，至少需要一种实际测量（即方法 3）来表示底土中的 OC 库。