Rainfall partitioning and associated chemical alteration in three subtropical urban tree species

2021 ◽  
pp. 127109
Author(s):  
Zhi-Yun Jiang ◽  
Qiu-Ying Zhi ◽  
John T. Van Stan ◽  
Si-Yi Zhang ◽  
Yi-Hua Xiao ◽  
...  
Keyword(s):  
Tree Species ◽  
Chemical Alteration ◽  
Urban Tree

scholarly journals Mapping the Urban Atmospheric Carbon Stock by LiDAR and WorldView-3 Data

Forests ◽  
2021 ◽  
Vol 12 (6) ◽  
pp. 692
Author(s):  
MD Abdul Mueed Choudhury ◽  
Ernesto Marcheggiani ◽  
Andrea Galli ◽  
Giuseppe Modica ◽  
Ben Somers
Keyword(s):  
Remote Sensing ◽  
Urban Area ◽  
Tree Species ◽  
Carbon Stock ◽  
Dominant Species ◽  
Remote Sensing Data ◽  
Data Sources ◽  
Lidar Data ◽  
Urban Tree ◽  
Sensing Data

Currently, the worsening impacts of urbanizations have been impelled to the importance of monitoring and management of existing urban trees, securing sustainable use of the available green spaces. Urban tree species identification and evaluation of their roles in atmospheric Carbon Stock (CS) are still among the prime concerns for city planners regarding initiating a convenient and easily adaptive urban green planning and management system. A detailed methodology on the urban tree carbon stock calibration and mapping was conducted in the urban area of Brussels, Belgium. A comparative analysis of the mapping outcomes was assessed to define the convenience and efficiency of two different remote sensing data sources, Light Detection and Ranging (LiDAR) and WorldView-3 (WV-3), in a unique urban area. The mapping results were validated against field estimated carbon stocks. At the initial stage, dominant tree species were identified and classified using the high-resolution WorldView3 image, leading to the final carbon stock mapping based on the dominant species. An object-based image analysis approach was employed to attain an overall accuracy (OA) of 71% during the classification of the dominant species. The field estimations of carbon stock for each plot were done utilizing an allometric model based on the field tree dendrometric data. Later based on the correlation among the field data and the variables (i.e., Normalized Difference Vegetation Index, NDVI and Crown Height Model, CHM) extracted from the available remote sensing data, the carbon stock mapping and validation had been done in a GIS environment. The calibrated NDVI and CHM had been used to compute possible carbon stock in either case of the WV-3 image and LiDAR data, respectively. A comparative discussion has been introduced to bring out the issues, especially for the developing countries, where WV-3 data could be a better solution over the hardly available LiDAR data. This study could assist city planners in understanding and deciding the applicability of remote sensing data sources based on their availability and the level of expediency, ensuring a sustainable urban green management system.

scholarly journals Assessment of Anthropogenic Volatile Organic Compounds in Leaves of Two Urban Tree Species in Santiago de Chile

2019 ◽  
Vol 2 ◽  
Author(s):  
Mauricio Araya ◽  
Daniela Seelenfreund ◽  
Marianne Buscaglia ◽  
Barbara Peña-Ahumada ◽  
Javier Vera ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Tree Species ◽  
Urban Tree ◽  
Santiago De Chile ◽  
Volatile Organic

scholarly journals Wind Loading on Scaled Down Fractal Tree Models of Major Urban Tree Species in Singapore

Forests ◽  
2020 ◽  
Vol 11 (8) ◽  
pp. 803
Author(s):  
Woei-Leong Chan ◽  
Yong Eng ◽  
Zhengwei Ge ◽  
Chi Wan Calvin Lim ◽  
Like Gobeawan ◽  
...  
Keyword(s):  
Wind Tunnel ◽  
Tree Species ◽  
Experimental Studies ◽  
Velocity Profiles ◽  
Aerodynamic Load ◽  
Tree Crowns ◽  
Urban Tree ◽  
Crown Shape ◽  
Optical Porosity ◽  
Tree Models

Estimation of the aerodynamic load on trees is essential for urban tree management to mitigate the risk of tree failure. To assess that in a cost-effective way, scaled down tree models and numerical simulations were utilized. Scaled down tree models reduce the cost of experimental studies and allow the studies to be conducted in a controlled environment, namely in a wind or water tunnel, but the major challenge is to construct a tree model that resembles the real tree. We constructed 3D-printed scaled down fractal tree models of major urban tree species in Singapore using procedural modelling, based on species-specific growth processes and field statistical data gathered through laser scanning of real trees. The tree crowns were modelled to match the optical porosity of real trees. We developed a methodology to model the tree crowns using porous volumes filled with randomized tetrahedral elements. The wind loads acting on the tree models were then measured in the wind tunnel and the velocity profiles from selected models were captured using particle image velocimetry (PIV). The data was then used for the validation of Large Eddy Simulations (LES), in which the trees were modelled via a discretized momentum sink with 10–20 elements in width, height, and depth, respectively. It is observed that the velocity profiles and drag of the simulations and the wind tunnel tests are in reasonable agreement. We hence established a clear relationship between the measured bulk drag on the tree models in the wind tunnel, and the local drag coefficients of the discretized elements in the simulations. Analysis on the bulk drag coefficient also shows that the effect of complex crown shape could be more dominant compared to the frontal optical porosity.

scholarly journals Effective Placement Methods of Vermicompost Application in Urban Tree Species: Implications for Sustainable Urban Afforestation

2020 ◽  
Vol 12 (14) ◽  
pp. 5822
Author(s):  
Huong Thi Thuy Dao ◽  
Jeong Min Seo ◽  
Jonathan O. Hernandez ◽  
Si Ho Han ◽  
Woo Bin Youn ◽  
...  
Keyword(s):  
Nutrient Uptake ◽  
Tree Species ◽  
Growth Parameters ◽  
Belowground Biomass ◽  
Chamaecyparis Obtusa ◽  
Urban Trees ◽  
Nutrient Concentrations ◽  
Larix Kaempferi ◽  
Urban Tree ◽  
Slow Growing

Knowledge on growth and nutrient uptake characteristics of urban trees and effective strategies to grow trees can help accomplish the goal of urban afforestation initiatives in a sustainable way. Thus, the study investigated the effects of different vermicompost (VC) application placements on the growth and nutrient uptake of three contrasting tree species (fast-growing Betula platyphylla and Larix kaempferi and slow-growing Chamaecyparis obtusa) to provide implications for growing tree stocks for sustainable urban afforestation programs. Five placement methods were used in the greenhouse trial: no fertilization (CON), surface placement (VCs), subsurface placement at 6-cm depth (VCc), bottom placement (35-cm depth (VCb)), and mixed with soil (VCm). We measured the growth parameters such as height, root collar diameter (RCD), and biomass and analyzed foliar nutrient concentrations in response to different placement treatments of VC. Relative height growth was the highest at VCc (132% (B. platyphylla), 114% (L. kaempferi)) and VCs ((57%) C. obtusa). Significant improvement in aboveground and belowground biomass growth of all species at VCs and VCc compared to the other treatments was also observed. Generally, VC treatments significantly increased N concentration compared to CON in all species. In conclusion, fertilizing the fast- and slow-growing urban tree species using VCs and/or VCc is relevant to growing high quality planting stocks for sustainable urban afforestation purposes.

Experimental warming alleviates the adverse effects from tropospheric ozone on two urban tree species

2021 ◽  
Vol 268 ◽  
pp. 115289
Author(s):  
Sheng Xu ◽  
Yijing Wang ◽  
Weiwei Zhang ◽  
Bo Li ◽  
Zhong Du ◽  
...  
Keyword(s):  
Adverse Effects ◽  
Tree Species ◽  
Tropospheric Ozone ◽  
Experimental Warming ◽  
Urban Tree

Comparing the transpirational and shading effects of two contrasting urban tree species

2019 ◽  
Vol 22 (4) ◽  
pp. 683-697 ◽  
Author(s):  
Mohammad A. Rahman ◽  
Astrid Moser ◽  
Thomas Rötzer ◽  
Stephan Pauleit
Keyword(s):  
Tree Species ◽  
Urban Tree ◽  
Shading Effects

Leaves of common urban tree species (Aesculus hippocastanum, Acer platanoides, Betula pendula and Tilia cordata) as a measure of particle and particle-bound pollution: a 4-year study

2019 ◽  
Vol 12 (9) ◽  
pp. 1081-1090 ◽  
Author(s):  
Mira Aničić Urošević ◽  
Gordana Jovanović ◽  
Nenad Stević ◽  
Isidora Deljanin ◽  
Miroslav Nikolić ◽  
...  
Keyword(s):  
Tree Species ◽  
Betula Pendula ◽  
Aesculus Hippocastanum ◽  
Tilia Cordata ◽  
Acer Platanoides ◽  
Urban Tree
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