CN 11-5366/S     ISSN 1673-1530
“风景园林,不只是一本期刊。”

花园城市背景下生境花园的建设路径与实践

Construction Approaches and Practices for Habitat Garden in the Context of Garden City

  • 摘要:
    目的 生境花园是实现花园城市“人与自然和谐共生”核心目标的实践载体,也是城市生物多样性保护的创新模式,厘清生境花园的科学建设路径是推动花园城市开展规模化、规范化生境花园建设的基础。
    方法 基于花园城市对生境花园的定位与要求,提出花园城市背景下生境花园释义,结合北京市园林绿化科学研究院生境花园实践,解析生境花园的建设路径及关键阶段的实施方法。
    结果 花园城市背景下生境花园的释义为既能为城市植物、动物、微生物提供可持续的栖息环境,又具有景观美化、休闲游憩、交流互动、公众教育、康养疗愈或人居环境改善等协同功能的城市绿色空间。生境花园建设路径包括场地选址与调查、生态环境潜能分析与目标物种或种群识别、生境修复与景观营造、动态监测与生境管理4个步骤。依据该步骤建设完成的北京市园林绿化科学研究院生境花园以天敌昆虫为目标恢复种群,在1年内实现了天敌昆虫丰富度与多度的显著提升,6年内完成了场地微生态系统食物链修复和营养关系修补,验证了生境花园建设路径的可行性与科学性。
    结论 全过程多领域的共同参与是生境花园建设的前提,生态环境潜能评价是生境花园建设的关键阶段,动态监测与遵从自然规律的生境管理是生境花园可持续发展的基本保障。生境花园以生物多样性支持为核心功能,以社会服务功能或其他生态系统服务功能为协同功能,既是实现花园城市“人与自然和谐共生”核心目标的实践载体,也是城市生物多样性保护的创新模式。

     

    Abstract:
    Objective “Habitat garden” is an urban green space that integrates “habitat” and “garden”, and is a garden with habitat function, and auxiliary functions such as landscape beautification, leisure and recreation, communication and interaction, public education, health and healing, or improvement of living environment. It is a practical carrier to achieve the core goal of a garden city featuring “harmonious coexistence between man and nature”, and it is also an innovative model for urban biodiversity conservation. Clarifying the scientific construction approaches is key to promote the large-scale and standardized construction of habitat gardens in garden cities.
    Methods Based on an in-depth examination of the definition and status of habitat gardens within the context of garden city construction, this research discusses in combination with practice, the feasible approach for habitat garden construction.
    Results The habitat garden construction approaches consist of the following 4 steps. Firstly, select a habitat garden site in combination with multi-scale site analysis, while investigating local and surrounding biotic and abiotic environments. Secondly, evaluate environmental potential and further identify the target species to be restored. Thirdly, implement the project of habitat restoration and landscape creation according to the habitat characteristics and local function positioning of those target species. Finally, carry out ecological monitoring and nature-based habitat management in the project. As for the site selection for habitat garden, a multi-scale feasibility analysis should be conducted first, involving the ecological analysis of landscape connectivity index and ecological sources, and the feasibility analysis of land management. Then a site investigation should be conducted, including the investigation of nonbiological environment aiming to reveal the habitat characteristics of the selected site and clarify prominent environmental issues of the site, accompanied by a species, population, or community investigation for existing and former plants, insects, birds, small mammals, amphibians and reptile, soil and surface arthropods, soil microorganisms, and other biological groups within and around the site in an effort to understand the current and potential distribution levels of biodiversity in the site. The evaluation of environmental potential encompasses four key analytical components: biological distribution potential analysis for evaluating local spatial distribution and local habitat suitability of dominant species, populations, and ecological communities; interspecific interaction potential analysis for examining trophic relationships, competitive interactions, and symbiotic associations among organisms; community succession potential analysis for investigating ecosystem succession trajectories, developmental rates, and potential equilibrium states; migration potential analysis for assessing dispersal capabilities and movement patterns of flora and fauna. The project entails habitat restoration and landscape recreation for target species and populations comprising two integral components: One is that habitat construction strategy should be based on habitat and feeding preferences of the target species and populations, and optimize conditions to support organisms’ survival, reproduction, and adaptive capacity against stressors by replenishing native vegetation and food resources, creating sheltered microhabitats with optimal perching conditions, and restoring natural refuges; the other is to set up artificial overwintering sites for natural enemies within the site. The nature-based habitat management encompasses two key aspects: One is to emphasize the “self sustain” of the ecosystem by minimizing artificial interference, such as night protection, noise isolation, and volunteer plant protection, and the other is to provide necessary artificial regulation that conforms to nature, such as the removal or cutting of malignant weeds. The ecological monitoring is to realize the sustainable development and dynamic regulation of habitat gardens. The monitoring results show that the richness and abundance of natural enemies (including natural enemy insects, aphidophagus natural enemies, and aphidophagus ladybugs) in a habitat garden after one year of construction of the garden, along with the abundance of lacewings, are significantly higher than in ordinary green spaces. Conversely, the average pest density per branch in ordinary green spaces is 3.91 times higher than in the habitat garden. The construction of habitat gardens has achieved the goals of restoring local food chains and repairing nutrient relationships, while significantly advancing sustainable pest control and biodiversity enhancement. The vegetation richness has increased from over 30 to over 130, as well as the diversity of birds. Mammals such as the Northeast Hedgehog (Erinaceus amurensis) and Weasel (Mustela sibirica) have also built burrows here as habitat.
    Conclusion This research proposes that the fundamental prerequisite for the construction of habitat gardens is the joint participation of multiple fields throughout the entire process, the key link for the construction of habitat gardens is the evaluation of environmental potential, and the basic guarantees for the sustainable development of habitat garden are ecological monitoring and habitat management in alignment with nature.

     

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