Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Foliar nitrogen characteristics of two tropical tree species along urban roads and parklands
Abstract Citywide tree planting in urban cities is occurring rapidly because of the benefits urban vegetation provide to the environment. Nutrient cycling in tropical urban ecosystems is relatively unknown. Nitrogen utilisation in urban and rural conditions can vary substantially hence foliar N characteristics of two common tree species grown in the tropics was compared between urban roads and parkland sites. The study was carried out in the tropical island state of Singapore situated 1° north of the equator. Foliar sampling of nitrate reductase, %C, %N, $ δ^{13} $C and $ δ^{13} $N in two tree species grown along urban roads and parklands were evaluated. Foliage sampled along roads were depleted of $ δ^{15} $N compared to parkland foliage. Significantly higher levels of $ δ^{13} $C, nitrate reductase activity (NRA), %C and %N were found in the northern and southern Parklands. Samanea saman, and Khaya senegalensis showed significantly greater ability to assimilate nitrate at the park sites, measured through NRA. There were no significant differences in foliar N and C characteristics between tree species. Significant variation in foliar N and C concentrations were only observed between regions and at park and road sites. The isotopic and %N data suggested greater N availability and higher available nitrate at park sites as a result of variable site histories. These previous land use, land cover change may have accumulated organic matter in the rhizosphere primarily in the stable form of humus alongside that of biological nitrogen fixation. N cycling in urban systems and associated physiological changes in vegetation is critical as these may have implications for carbon sequestration, while N retention or export can impact on water quality in urban environments.
Foliar nitrogen characteristics of two tropical tree species along urban roads and parklands
Abstract Citywide tree planting in urban cities is occurring rapidly because of the benefits urban vegetation provide to the environment. Nutrient cycling in tropical urban ecosystems is relatively unknown. Nitrogen utilisation in urban and rural conditions can vary substantially hence foliar N characteristics of two common tree species grown in the tropics was compared between urban roads and parkland sites. The study was carried out in the tropical island state of Singapore situated 1° north of the equator. Foliar sampling of nitrate reductase, %C, %N, $ δ^{13} $C and $ δ^{13} $N in two tree species grown along urban roads and parklands were evaluated. Foliage sampled along roads were depleted of $ δ^{15} $N compared to parkland foliage. Significantly higher levels of $ δ^{13} $C, nitrate reductase activity (NRA), %C and %N were found in the northern and southern Parklands. Samanea saman, and Khaya senegalensis showed significantly greater ability to assimilate nitrate at the park sites, measured through NRA. There were no significant differences in foliar N and C characteristics between tree species. Significant variation in foliar N and C concentrations were only observed between regions and at park and road sites. The isotopic and %N data suggested greater N availability and higher available nitrate at park sites as a result of variable site histories. These previous land use, land cover change may have accumulated organic matter in the rhizosphere primarily in the stable form of humus alongside that of biological nitrogen fixation. N cycling in urban systems and associated physiological changes in vegetation is critical as these may have implications for carbon sequestration, while N retention or export can impact on water quality in urban environments.
Foliar nitrogen characteristics of two tropical tree species along urban roads and parklands
Ow, Lai Fern (Autor:in) / Ghosh, Subhadip (Autor:in) / Yusof, Mohd Lokman (Autor:in)
Urban Ecosystems ; 23
2020
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
BKL:
43.31
Naturschutz
/
42.90$jÖkologie: Allgemeines
/
43.31$jNaturschutz
/
42.90
Ökologie: Allgemeines
/
74.12
Stadtgeographie, Siedlungsgeographie
/
74.12$jStadtgeographie$jSiedlungsgeographie
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