Relationships between urbanization, tree morphology, and carbon density: An integration of remote sensing, allometric models, and field survey

《Relationships between urbanization, tree morphology, and carbon density: An integration of remote sensing, allometric models, and field survey》

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作者: Jian Lin;Qin Ma;Yang Ju;Hongsheng Zhang;Qiang Wang;Bo Huang

来源: URBAN FORESTRY & URBAN GREENING,Vol.76,Issue1,Article 127725

语言: 英文

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Ecology of the Ministry of Science and Technology and Fujian Province, Fujian Normal University, Fuzhou 350007, China;Department of Geography and Resource Management, The Chinese University of Hong Kong, Shatin, Hong Kong;Institute of Space and Earth Information Science, The Chinese University of Hong Kong, Shatin, Hong Kong;Sierra Nevada Research Institute, University of California, Merced, Merced, CA 95340, USA;School of Geography, Nanjing Normal University, Nanjing 210023, China;School of Architecture and Urban Planning, Nanjing University, Nanjing 210093, China;Department of Geography, The University of Hong Kong, Pokfulam, Hong Kong;School of Geographical Sciences, Fujian Normal University, Fuzhou 350007, China;State Key Laboratory for Subtropical Mountain Ecology of the Ministry of Science and Technology and Fujian Province, Fujian Normal University, Fuzhou 350007, China;Department of Geography and Resource Management, The Chinese University of Hong Kong, Shatin, Hong Kong;Institute of Space and Earth Information Science, The Chinese University of Hong Kong, Shatin, Hong Kong

摘要: Urban trees store and sequester large amounts of carbon and are a vital component of natural climate solutions. Despite the well-recognized carbon benefits of urban trees, there is limited effort to examine how spatial distribution of carbon density varies across distinctive social, demographic, and built dimensions of urban landscapes. Moreover, it is unclear whether specific aspects of landscape structure and design could help increase carbon densities in urban trees. Here, we produced a fine-resolution carbon density map of urban trees in New York City (NYC) by integrating high-resolution land cover map, LiDAR-derived tree metrics, i-Tree Eco, and field survey data. We then explored spatial variations of carbon density across the gradients of urban development intensity, social deprivation index, and neighborhood age, and we examined the relationships between carbon density, and fragmentation, aggregation, size, and shape of tree canopy cover. We find that carbon stored in urban trees in NYC is estimated as 1078 Gg, with an average density of 13.8 Mg/ha. This large amount of carbon is unevenly distributed, with carbon densities being highest in Bronx and in open parks and street trees. Furthermore, carbon densities are negatively associated with urban development intensity and the social gradient of deprivation. Regarding the impacts of tree morphology on carbon density, our results show that while the amount of tree cover is the most influential factor in determining carbon density, small-sized forest patches and moderate levels of forest edges are also conductive to increasing carbon densities of urban trees. To incorporate urban forestry into developing innovative, effective, and equitable climate mitigation strategies, planners and decision makers need to identify the optimal spatial configuration of urban forests and invest in tree planting programs in marginalized communities.