New Issue Published: Landscape Architecture, Volume 2026, Issue 1
Landscape Architecture is pleased to announce the publication of Volume 2026, Issue 3. The new issue is now available online
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Volume 115 Issue 3
- Research article
by
1Landscape Architecture Department, Imam Abdulrahman Bin Faisal University (IAU)
- Volume 115 Issue 3
- Pages: 86
- - 104
- https://doi.org/10.70517/la20251153-06
While urban greening can enhance thermal comfort, public space quality and ecological continuity, the impact of daylight ozone formation hinges on the composition of tree species, local transport system and chemical reactions involving nitrogen oxide. For this analysis, Bologna’s tree population-specific canopy renewal target has been calculated with ten broadleaf species as Pi = fiEi, pollutant-response coefficient and receptor attenuation threshold using their isoprene emission potentials, statistics, ozone and nitrogen oxide response rates and daylight ozone increment for Irnerio, Montagnola, University Gardens and Berti Pichat receptors. Isoprene production is highly concentrated in Bologna’s assemblage with Platanus × acerifolia, contributing 57.90% of normalized isoprene potential, and Sophora japonica making up for additional 21.08%. The two species contribute together 78.98% of normalized isoprene emission potential with first five species providing 99.25%. Ozone has a stronger response rate compared to that of nitrogen oxides (KO3=0.783 versus KNOx=0.257). As such, daylight ozone increment may be adopted as the managed endpoint in canopy management. University Gardens receptor is controlled by the daylight ozone increment of 6.7% while those of Irnerio, Montagnola and Berti Pichat are 2.3%, 1.9% and 0.8%, respectively. Within the constraint of 2% daylight ozone increment, University Gardens needs to have the reduction of 70.1% isoprene production potential while Irnerio only 13.0%. Replacing completely Platanus × acerifolia and Sophora japonica results in the University Gardens’ residual daylight ozone increment of about 1.41%.
- Research article
by
1The University of Sheffield
- Volume 115 Issue 3
- Pages: 71
- - 85
- https://doi.org/10.70517/la20251153-05
In photovoltaic green roofs, the electricity generation takes place over the vegetated surface via solar-electric process, whereas the thermal behavior is governed by evapotranspiration, substrate heat storage, and vegetation exposure under the effect of solar radiation. In the following section, a measured data set of sedum green roof in Ljubljana with elevated photovoltaics will be analyzed based on the comparison of three shade conditions of the vegetation surface: unshaded, partially shaded, and fully shaded. The Hydrothermal Constraint Number depends on evapotranspiration similarity, the vegetation-temperature correlation adjusted according to shading, photovoltaics’ correction to the evapotranspiration in the longwave range, and daytime heat-flux fraction to the heat flux reference. The measured evapotranspiration rate for 9 July 2024 is 3.98 mm day−1, and the modeled value is 4.15 mm day−1; for 25 July 2024, they are 4.08 mm day−1 and 3.95 mm day−1; and for 3 August 2024, they are 2.60 mm day−1 and 2.73 mm day−1. Thus, the corresponding RMSE is 0.145 mm day−1, the mean absolute error is 4.15 %, and the fidelity coefficient is 0.959. The vegetation-temperature correlation, θv = 0.935θa + 0.011Rg(1 − S), implies that every reduction of the short-wave shade-sensitive irradiation by 100 W m−2 results in the decrease of the solar thermal component of approximately 1.1 °C. Photovoltaics correction to the evapotranspiration by the long-wave exchange leads to the change in evapotranspiration.
Call for Papers
Landscape Architecture invites submissions for Volume 2026, Issue 3, scheduled for publication in September 2026. The journal welcomes high-quality scholarly contributions that advance research, theory, criticism, and applied knowledge in landscape architecture and related fields.