Abstract The emission of climate-relevant gases, especially carbon dioxide, is often associated with urban areas. However, cities have accumulated organic carbon in their soils and vegetation over centuries and offer important ecosystem services for the city through carbon storage. The aim of this study is to estimate the total carbon storage of the central European city of Berlin by combining the organic carbon (Corg) stored in soils and the carbon found in aboveground biomass. We used 432 soil samples that were taken across 18 different land uses in order to estimate the carbon content for each land use based on the laboratory findings of each sample. This large amount of data, which is excellent for such a study, provides an important basis for the evaluation and analysis of the carbon storage potential. Taking into account the degree of soil sealing, the carbon calculations for each individual land use were then transferred to the total area of Berlin in order to produce a spatially explicit carbon map. Soil carbon stocks are reported as units of carbon either as kg/m² or in t/ha for each block. The carbon storage was estimated for both topsoil and subsoil. In addition, we estimated the carbon stored in 596,975 street trees and park trees according to the biomass equations for each tree species. The results show that more than two-thirds of the carbon present is accounted for by soils, which makes them the largest carbon reservoir of the city. Park trees store the most carbon in urban trees apart from urban forest trees. The total carbon stock of Berlin was estimated to be 24,087,344 tons, which corresponds to an approximate quantity of 270 t/ha. The distribution of carbon storage across the city shows the highest values towards the city boundaries. This holds true for the soil as well as the vegetation. The greatest quantities of total carbon are stored in the subsoils of the city’s suburbs. This study is the first of its kind to combine the carbon stocks of the soil and the vegetation in a city in order to estimate its carbon storage potential. It provides detailed soil carbon maps and biomass estimations, which can contribute to carbon storage investigations in other cities with similar climatic and ecological conditions.

中文翻译：

---

德国柏林的碳库：土壤和地上树木中的有机碳

摘要 与气候相关的气体，尤其是二氧化碳的排放通常与城市地区有关。然而，几个世纪以来，城市在土壤和植被中积累了有机碳，并通过碳储存为城市提供重要的生态系统服务。本研究的目的是通过结合土壤中储存的有机碳 (Corg) 和地上生物量中的碳来估算中欧城市柏林的总碳储存量。我们使用了在 18 种不同土地用途中采集的 432 个土壤样品，以便根据每个样品的实验室发现来估计每种土地用途的碳含量。如此大量的数据，对于这样的研究来说是极好的，为碳储存潜力的评估和分析提供了重要的依据。考虑到土壤密封的程度，然后将每个单独土地用途的碳计算转移到柏林的总面积，以生成空间明确的碳图。对于每个区块，土壤碳储量以碳单位报告为 kg/m² 或 t/ha。对表土和底土的碳储存进行了估算。此外，我们根据每种树种的生物量方程估算了 596,975 棵行道树和公园树的碳储存量。结果表明，目前超过三分之二的碳来自土壤，这使土壤成为该市最大的碳库。除城市森林树木外，公园树木在城市树木中储存的碳最多。柏林的总碳储量估计为 24,087,344 吨，相当于大约 270 吨/公顷的数量。整个城市的碳储存分布显示出城市边界的最高值。这适用于土壤和植被。最大数量的总碳储存在城市郊区的底土中。这项研究首次将城市土壤和植被的碳储量结合起来，以估算其碳储存潜力。它提供了详细的土壤碳图和生物量估算，有助于其他气候和生态条件相似的城市的碳储存调查。这项研究首次将城市土壤和植被的碳储量结合起来，以估算其碳储存潜力。它提供了详细的土壤碳图和生物量估算，有助于其他气候和生态条件相似的城市的碳储存调查。这项研究首次将城市土壤和植被的碳储量结合起来，以估算其碳储存潜力。它提供了详细的土壤碳图和生物量估算，有助于其他气候和生态条件相似的城市的碳储存调查。