Diversity, structure, and carbon sequestration potential of the woody flora of urban squares in the Brazilian semiarid region
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Cited by 3 publications
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A Systematic Review of Urban Vegetation Research during 2000–2023: A Bibliometric Analysis
Urban vegetation is a fundamental element and the keystone of urban ecological systems. Therefore, better comprehending the patterns of change over time and space in this vegetation is crucial for more effective urban environment management to enhance urban habitat and counteract the negative impacts of accelerated urbanization. This study examined 1,081 articles listed in the Scopus database on urban vegetation between 2000 and 2023. After being exported in CSV format, these data were analyzed using VOSviewer for data visualization, Scopus Analytics for performance evaluation, MS Excel for organizing data in graphical form, and CiteSpace for examining the emergence of keywords. The objective was to offer guidance on current topics and forecast future research trends related to this theme. This analysis shows that in 2000, only 5 articles on urban vegetation were published, which has risen by 2840% to 142 in 2023, following a quadratic function (R2 = 0.9524). China is the country most interested in this topic, with 273 articles (25.25%). Thus, China and the United States are the most cooperative nations on the urban vegetation subject. Over the past 24 years, the environmental science field has contributed the most, with 33.3% of papers published. Concerning sources, the journal Urban Forestry and Urban Greening comes first with 73 articles and 2127 citations. The keyword “urban vegetation” is the most frequently used by authors (occurrences: 330, links: 115, and total link strength: 459). In terms of cocitations, an analysis of 75887 authors revealed that X. Li came out first with a total link strength of 21626 and 507 citations while G. D. Jenerette takes first place, concerning the co‐authorship with 11 publications and 899 citations. Moreover, the Chinese Academy of Sciences is the most effective and influential institution on the subject. Keyword emergence analysis revealed that urban growth, urban development, and ecosystem services have become current research hotspots with considerable impact over the past three years. This work has provided structured data, guidelines, and useful recommendations for further investigations, which can contribute to a better comprehension of the environmental features of urban vegetation.
A Systematic Review of Urban Vegetation Research during 2000–2023: A Bibliometric Analysis
Urban vegetation is a fundamental element and the keystone of urban ecological systems. Therefore, better comprehending the patterns of change over time and space in this vegetation is crucial for more effective urban environment management to enhance urban habitat and counteract the negative impacts of accelerated urbanization. This study examined 1,081 articles listed in the Scopus database on urban vegetation between 2000 and 2023. After being exported in CSV format, these data were analyzed using VOSviewer for data visualization, Scopus Analytics for performance evaluation, MS Excel for organizing data in graphical form, and CiteSpace for examining the emergence of keywords. The objective was to offer guidance on current topics and forecast future research trends related to this theme. This analysis shows that in 2000, only 5 articles on urban vegetation were published, which has risen by 2840% to 142 in 2023, following a quadratic function (R2 = 0.9524). China is the country most interested in this topic, with 273 articles (25.25%). Thus, China and the United States are the most cooperative nations on the urban vegetation subject. Over the past 24 years, the environmental science field has contributed the most, with 33.3% of papers published. Concerning sources, the journal Urban Forestry and Urban Greening comes first with 73 articles and 2127 citations. The keyword “urban vegetation” is the most frequently used by authors (occurrences: 330, links: 115, and total link strength: 459). In terms of cocitations, an analysis of 75887 authors revealed that X. Li came out first with a total link strength of 21626 and 507 citations while G. D. Jenerette takes first place, concerning the co‐authorship with 11 publications and 899 citations. Moreover, the Chinese Academy of Sciences is the most effective and influential institution on the subject. Keyword emergence analysis revealed that urban growth, urban development, and ecosystem services have become current research hotspots with considerable impact over the past three years. This work has provided structured data, guidelines, and useful recommendations for further investigations, which can contribute to a better comprehension of the environmental features of urban vegetation.
Carbon Sequestration and Storage of Urban Trees in a Polluted Semiarid City
Cities play a critical role in anthropogenic CO2 emissions, which exacerbate climate change and impact urban populations. Urban green infrastructure, such as urban trees, provides essential ecosystem services, including reducing atmospheric CO2 levels. However, there is a significant knowledge gap regarding the impact of urban trees on climate change in semiarid, polluted cities like Tehran, the capital and largest metropolis of the Middle East. This study assesses the carbon sequestration and storage potential of Tehran’s urban infrastructure using the i-Tree Eco model. A randomized cluster sampling method was employed, collecting data on species composition, diameter at breast height (DBH), and total tree height. The results indicate that Tehran’s urban trees sequester approximately 60,102 tons of carbon per year, equivalent to 220,393 tons of CO2. The net carbon storage in urban trees is about 254,579 tons, equivalent to 933,455 tons of CO2. Parks and urban green spaces demonstrate the highest rate of carbon sequestration per hectare, followed by urban services land use. Prioritizing the planting of species with high sequestration rates like Cupressus arizonica (Arizona cypress) and Cupressus sempervirens L. var. horizontalis (Mediterranean cypress) could enhance carbon sequestration efforts in Tehran. These data provide valuable insights into the carbon sequestration potential and environmental impact of different land use types, and may aid in the development of effective environmental policies and land management strategies in semiarid urban areas and other cities in similar settings.
Growth, Evapotranspiration, Gas Exchange and Chl a Fluorescence of Ipê-Rosa Seedlings at Different Levels of Water Replacement
In general, young plants in the establishment phase demonstrate sensitivity to changes in environmental conditions, especially regarding water availability. The effects of the seasonality of biophysical processes on plant physiology can trigger differential responses, even within the same region, making it necessary to conduct studies that characterize the physiological performance of the species at different spatial and temporal scales, making it possible to understand their needs and growth limits under water stress conditions. This paper aimed to evaluate the growth, gas exchange and Chl a fluorescence in ipê-rosa seedlings subjected to levels of water replacement (LWRs) of 100, 75, 50 and 25% in a greenhouse. The morphometric variables of plant height, diameter at stem height, numbers of leaves and leaflets, root length and volume, plant dry mass and leaf area were evaluated. The potential evapotranspiration of seedlings (ETc) was obtained using direct weighing, considering the water replacement of 100% of the mass variation between subsequent days as a reference; the cultivation coefficients (kc) were obtained using the ratio between ETc and the reference evapotranspiration (ETo) obtained by the Penman–Monteith FAO-56 method. Biomass and evapotranspiration data were combined to determine water sensitivity. Diurnal fluxes of gas exchange (net photosynthesis rate, transpiration rate, stomatal conductance, internal and atmospheric carbon ratio, water use efficiency and leaf temperature) and Chl a fluorescence (Fv/Fm, ΦPSII, ETR, Fv′/Fm′, NPQ and qL) were evaluated. Water restriction caused reductions of 90.9 and 84.7% in the increase in height and diameter of seedlings subjected to 25% water replacement when compared to seedlings with 100% water replacement. In comparison, biomass accumulation was reduced by 96.9%. The kc values increased throughout the seedling production cycle, ranging from 0.59 to 2.86. Maximum water sensitivity occurred at 50% water replacement, with Ky = 1.62. Maximum carbon assimilation rates occurred in the morning, ranging from 6.11 to 12.50 µmol m−2 s−1. Ipê-rosa seedlings regulate the physiology of growth, gas exchange and Chl a fluorescence depending on the amount of water available, and only 25% of the water replacement in the substrate allows the seedlings to survive.
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