Urban allotment gardens (UAG) are important for: the provision of foodstuffs, social cohesion, residents' well-being, and prevention of the formation of local heat islands during summer. The soils of these gardens however may be adversely affected by pollution threats and thus create health risks. In such cases, appropriate management becomes necessary. For several gardens exhibiting soil contamination (e.g. Pb at 100-400 mg kg-1) in the city of Nantes, local actors collaborated, including: scientists, the municipality's Parks and Open Space Department, elected officials, sanitary administration, and each site's gardeners' association. The soil characterization step was performed along with a sanitary risk evaluation and discussion of management options, based on both the pollution characteristics and local context. The most frequent option consisted of replacing the polluted soils with clean soils. Managing the excavated polluted soils on-site (e.g. for ornamental purposes) limited the economic and environmental impacts associated with this solution. Alternative solutions, including a combined system of non-accumulative cropping vegetables at the time of phytoextraction, were also employed to maintain gardening uses. In some cases, land use (gardening) was changed into, for example, an orchard, open space or ornamental space. A combination of solutions was introduced in several gardens. The various options available for managing polluted soils, as implemented in Nantes' UAGs and based mainly on NBS, can be applied more generally in order to improve soil quality. In addition to enhancing the quality of both residents' lives and biodiversity, several solutions This article is protected by copyright. All rights reserved. allow preserving or even restoring soil functions.

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支持城市分配花园土壤质量的管理举措：来自南特的例子（法国）

城市分配花园 (UAG) 在以下方面很重要：提供食物、社会凝聚力、居民福祉以及防止夏季形成局部热岛。然而，这些花园的土壤可能受到污染威胁的不利影响，从而造成健康风险。在这种情况下，需要适当的管理。对于南特市的几个土壤污染（例如铅含量为 100-400 mg kg-1）的花园，当地参与者进行了合作，包括：科学家、市政府的公园和开放空间部门、民选官员、卫生行政部门和每个地点的园丁' 协会。根据污染特征和当地环境，进行土壤表征步骤以及卫生风险评估和管理方案讨论。最常见的选择是用干净的土壤替换受污染的土壤。现场管理挖掘出的污染土壤（例如用于观赏目的）限制了与该解决方案相关的经济和环境影响。替代解决方案，包括在植物提取时采用非累积种植蔬菜的组合系统，也被用于维持园艺用途。在某些情况下，土地用途（园艺）被改为例如果园、开放空间或装饰空间。在几个花园中引入了解决方案的组合。在南特的 UAG 中实施并主要基于 NBS 的各种可用于管理污染土壤的选项可以更普遍地应用以改善土壤质量。除了提高居民生活质量和生物多样性外，几种解决方案 本文受版权保护。版权所有。允许保持甚至恢复土壤功能。