Modelling the impacts of soil sealing and climate change on urban tree growth and cooling in public squares of Munich
ミュンヘンの公共広場における土壌被覆と気候変動が都市樹木の成長と冷却に与える影響のモデリング (AI 翻訳)
Vjosa Dervishi, H. Pretzsch, Stephan Pauleit, Thomas Rötzer
🤖 gxceed AI 要約
日本語
ミュンヘンの25の公共広場を対象に、土壌被覆と気候変動が都市樹木の成長と冷却効果に与える影響をモデル化。現在気候下で被覆を20%削減すると、バイオマス増加量が21.5%、樹冠被覆率が25%向上し、蒸散による冷却効率が13.2%増加。一方、RCP8.5シナリオ下では将来の成長と冷却が減少し、被覆削減の効果も弱まる。実測データでは樹冠密度が歩行者レベルの冷却の主要因であり、最大2.7°Cの気温低下を確認。
English
This study models how soil sealing and climate change affect tree growth and cooling in 25 public squares in Munich. Under current climate, reducing soil sealing by 20% boosts biomass increment by 21.5% and cooling efficiency by 13.2%. Under the RCP8.5 scenario, growth and transpirational cooling decline by 16.5% and 5.6%, respectively, and the cooling benefit of unsealing weakens to about 4%. Empirical measurements show canopy density is the primary driver, with air temperature reductions up to 2.7°C.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
日本の都市でもヒートアイランド対策として緑化が進められているが、土壌被覆と将来の気候変動の複合的影響を考慮した研究は少ない。本研究の知見は、日本の都市計画や環境影響評価において、樹木の冷却効果を持続可能にするための設計指針に貢献する可能性がある。
In the global GX context
As cities worldwide seek nature-based solutions for climate adaptation, this study provides quantitative evidence on how soil permeability and canopy cover interact with future climate conditions. The findings highlight the need to consider long-term climate scenarios when designing urban green infrastructure, relevant for global urban climate policy and planning.
👥 読者別の含意
🔬研究者:Provides a modeling framework and empirical data linking soil sealing, climate scenarios, and tree cooling performance, useful for urban ecosystem research.
🏢実務担当者:Offers actionable insights for urban planners: reducing soil sealing by 20% significantly enhances tree growth and cooling, but future climate may diminish these benefits.
🏛政策担当者:Informs urban climate adaptation policies by demonstrating that green infrastructure effectiveness depends on both design (soil permeability) and future climate conditions.
📄 Abstract（原文）
Trees are crucial for mitigating the urban heat island effect, but their growth and cooling capacity are increasingly challenged by climate change and extensive soil sealing. This study analyzed how surface sealing and future climate conditions jointly affect tree growth and microclimatic cooling across 25 public squares in Munich, Germany. Using the process-based CityTree model, we simulated biomass increment per unit basal area and transpiration-driven cooling under current climate (1991–2020) and future (2081–2090) climate conditions, following the Representative Concentration Pathway (RCP) 8.5 from the IPCC Fifth Assessment Report (AR5). These simulations were complemented by empirical air temperature measurements (iButton sensors) collected during one summer season to characterize current shade-cooling patterns. Model results indicated that reducing soil sealing by 20% under current conditions enhanced biomass increment by 21.5% and canopy cover by 25%, accompanied by a 13.2% increase in cooling efficiency through transpiration. Under the RCP 8.5 scenario, predicted biomass increment and canopy cover declined by 16.5% and 15%, respectively, while the cooling improvement due to soil unsealing weakened to about 4%, reflecting constraints from higher temperatures and reduced water availability. Empirical microclimatic measurements revealed substantial variation in shade-cooling effects: at Alpenplatz (56% canopy cover), air temperatures dropped by up to 2.7 °C during peak hours, while heavily paved squares such as Bordeauxplatz and Marstallplatz showeed smaller reductions of 1.4 °C and 1.8 °C, respectively. These findings highlight the pivotal role of soil permeability and spatial design in maintaining tree vitality and microclimatic regulation in densely built urban environments. Analyzed the combined impacts of soil sealing and RCP 8.5 climate change on urban tree performance in Munich, Germany. Under the future RCP 8.5 scenario, modelled growth and transpirational cooling are projected to decline by 16.5% and 5.6%, respectively. The effectiveness of unsealing for cooling is projected to weaken under future climate (~ 4%) as drought-induced stomatal closure limits latent heat flux. Empirical measurements confirm that canopy density is the primary driver of pedestrian-level cooling, with air temperature reductions up to 2.7 °C.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1007/s11252-026-01973-xfirst seen 2026-05-05 19:13:33
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