ARBORICULTURE & CONTENTS URBAN FORESTRY Volume 46, No. 3, May 2020 Formerly the Journal of Arboriculture, 1975 – 2005 (Volumes 1 – 31) Yuri Rommel Vieira Araújo, Thiago Freire Melquíades, Monica Carvalho, and Luiz Moreira Coelho Jr. Time Series Analysis of Urban Forest Waste in João Pessoa (Northeast Brazil) .................163 Abstract. Urban afforestation requires management to ensure its sustainability within the city, and urban pruning waste is generated regularly throughout the year. This paper analyzed the time series of the urban pruning waste volume for João Pessoa (Northeast Brazil) from January 2008 to December 2014, with the objective of determining the volume of urban pruning waste generated and adjusting it to a forecast model. The models studied were part of the ARIMA (Autoregressive Integrated Moving Average) Family. The main results indicated that the ARIMA family models presented satisfactory results for the forecast, and ARIMA (0,1,4) was the model that provided the best forecast for 2014. This study contributes with a better understanding of the pattern and amount of urban pruning waste generated in João Pessoa and could assist the future orientation of municipal public policies. Keywords. ARIMA; Biomass; Forecasting; Forest Economy. Rafael da Silveira Bueno, Emilio Badalamenti, Ettore Barone, Andrea Cairone, Andrea La Mantia, Giovanna Sala, and Tommaso La Mantia First Assessment of Natural Regeneration and Seed Dispersal of Persian Walnut ( L.) in Mediterranean Agroecosystems ............................................................174 Abstract. Persian walnut (Juglans regia L.), which is native to Central Asia, has been widely cultivated throughout Europe over millennia as a multipurpose tree. However, only recently the naturalization process outside cultivation has been studied, mostly in temperate Europe, with no information regarding the Mediterranean region. Here we provide the first field investigations about the natural regeneration of walnut in two traditional Mediterranean agroecosystems: an irrigated mixed orchard in suburban areas and a non-irrigated prickly pear (Opuntia ficus indica [L.] Mill.) orchard. The natural regeneration densities were statistically different in the two agroecosystems, ranging from 75 individu- als per hectare in the prickly pear orchard to 200 individuals per hectare in the mixed orchard. Crows were frequently observed actively carrying walnuts in both environments. The irrigation practices and the shade provided by larger trees in the mixed orchard, and the potential benefits provided by prickly pear individuals, seemed to be crucial for seedling establishment and development in the two orchards, respectively. On the other hand, climate does not seem to represent a constraint for walnut recruitment, even if the mean annual temperature at the mixed orchard is slightly above the optimal temperature for walnut. Other biotic and abiotic factors that may trigger or hamper the naturalization process are also discussed in this paper, which explores the research needs for better understanding the naturalization potential of the Persian walnut in Medi- terranean agroecosystems, as well as the effects of different land uses and future climate change on this process. Keywords. Agroforestry Systems; Climate Change; Corvus cornix; Naturalization; Walnut Recruitment. Emily S. Huff, Michelle L. Johnson, Lara A. Roman, Nancy F. Sonti, Clara C. Pregitzer, Lindsay K. Campbell, and Heather McMillen A Literature Review of Resilience in Urban Forestry ..............................................................185 Abstract. Urban forests provide many benefits to residents and may also improve cities’ resilience, the overall capacity to recover from anthro- pogenic and natural disturbances. Resilience is often considered from an ecological, social, or social-ecological perspective. In this literature review, we synthesize past studies (n = 31) to explore resilience in urban forests and green spaces and to understand how social or ecological perspectives have been considered. We found studies that combine resilience and urban forests have been increasing over time. Definitions of both resilience and urban forests are highly variable, but generally the studies increasingly focus on a social-ecological systems approach. The most common theoretical framework applied to understanding urban forests and resilience is a risk and vulnerability assessment approach. ©2020 International Society of Arboriculture J ug lans r e gia
May 2020
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