scholarly journals Predictive Open-grown Crown Width Equations for Three Oak Species Planted in a Southern Urban Locale

2012 ◽  
Vol 38 (2) ◽  
pp. 58-63
Author(s):  
Nicholas Martin ◽  
Arthur Chappelka ◽  
Edward Loewenstein ◽  
Gary Keever ◽  
Greg Somers
Keyword(s):  
Urban Areas ◽  
Urban Landscape ◽  
Urban Forest ◽  
Leaf Biomass ◽  
Crown Width ◽  
Quercus Nuttallii ◽  
Independent Variable ◽  
Species Specific ◽  
Crown Dimensions ◽  
Planted Tree

Models that predict ecosystem services in urban areas are useful tools to urban forest managers. Predictive open-grown crown width equations were developed for three oak species common in urban forests in the southern United States. Tree crown form is an important component of these equations; however, there are few predictive equations available for urban, open-grown trees. The species used were Quercus lyrata Walt. (overcup oak), Quercus nuttallii Palmer (Nuttall oak), and Quercus phellos L. (willow oak). The study authors believe that these are the first predictive open-grown crown width equations developed for these species in the southern U.S. Diameter at breast height (DBH) (independent variable), DBH2 (independent variable), and average crown width (dependent variable) data were used to create the predictive crown width equations and yielded R2 values of 0.96, 0.94, and 0.91 for overcup, Nuttall, and willow oaks, respectively. These equations can aid urban landscape and utility planners by providing a means to predict crown dimensions at varying trunk diameters. Field time could also be minimized by reducing the need to measure crown width and with time, these equations could be used to validate species specific equations (e.g., leaf biomass) for these and other southern urban-planted tree species.

scholarly journals Trait-dependent tolerance of bats to urbanization: a global meta-analysis

2018 ◽  
Vol 285 (1885) ◽  
pp. 20181222 ◽  
Author(s):  
Kirsten Jung ◽  
Caragh Grace Threlfall
Keyword(s):  
Functional Traits ◽  
Urban Areas ◽  
Urban Landscape ◽  
Meta Analysis ◽  
Urban Habitat ◽  
Local Conservation ◽  
Conservation Actions ◽  
Functional Homogenization ◽  
Species Specific ◽  
North And South America

Urbanization is a severe threat to global biodiversity, often leading to taxonomic and functional homogenization. However, current urban ecology research has focused mostly on urban birds and plants, limiting our ability to make generalizations about the drivers of urban biodiversity globally. To address this gap, we conducted a global meta-analysis of 87 studies, including 180 bat species (Chiroptera) from urban areas in Asia, Australia, Europe, North and South America. We aimed to (i) understand the importance of functional traits and phylogeny in driving changes in urban bat assemblages, and (ii) assess the capacity of traits for predicting which types of species are most sensitive to urbanization. Our results indicate that species-specific functional traits explain differences in the intensity of urban habitat use. Urban tolerance mainly occurred within the open and edge space foraging and trawling species as well as in bats with flexible roosting strategies. In addition, across bioregions and independent of phylogeny, urban tolerance correlated with higher aspect ratio, a trait enabling fast flight but less agile manoeuvres during aerial food acquisition. Predictive success varied between bioregions, between 43 and 83%. Our analysis demonstrates that the local extinction of bat species in urban areas is non-random, trait-based and predictable, allowing urban landscape managers to tailor local conservation actions to particular types of species.

scholarly journals Rapid Assessment of Change and Hurricane Impacts to Houston’s Urban Forest Structure

2011 ◽  
Vol 37 (2) ◽  
pp. 60-66
Author(s):  
Christina Staudhammer ◽  
Francisco Escobedo ◽  
Alicia Lawrence ◽  
Mary Duryea ◽  
Pete Smith ◽  
...  
Keyword(s):  
Growth Rates ◽  
Forest Structure ◽  
Urban Areas ◽  
Urban Forest ◽  
Rapid Assessment ◽  
Tree Level ◽  
Hurricane Ike ◽  
Hurricane Impacts ◽  
Crown Width ◽  
Annual Mortality

A subsample of 332, 0.06-hectare plots measured during 2001–2002 in Houston, TX, U.S., were relocated and measured in 2008 following Hurricane Ike. These 37 re-measured plots provide a unique opportunity to explore the effects of urbanization and hurricanes on the forest structure of coastal urban forests. Statistical analyses of growth, mortality, and in-growth were conducted using plot- and tree-level factors. In total, 305 trees were re-measured, of which 195 (63.9%) still remained on-site and 110 (36.1%) had been removed. Ninety-seven (31.8%) of these trees were determined to be removed due to urbanization and 13 trees (4.3%) were removed due to hurricane impacts. Results show an overall annual net loss in tree numbers and an increase in tree density during the analysis period. Average annual mortality and in-growth rates were 3.9% and 5.3%, respectively. Growth rates were significantly influenced by land cover type, tree stem diameter, crown width, and percent dieback (P < 0.05). Overall, Hurricane Ike resulted in the removal of 4.3% of all trees measured, with removal occurring on six (16%) of the 37 re-measured plots. These initial findings could be used to understand changes in forest structure in coastal urban areas, improve estimates of carbon sequestration, and develop management goals.

scholarly journals The palm leaves falling periods and characteristics of royal palm (Roystonea regia (Kunth) F.Cook) at IPB Dramaga Campus, Bogor, Indonesia

2021 ◽  
Vol 918 (1) ◽  
pp. 012016
Author(s):  
H E Nindiar ◽  
M Majiidu ◽  
U Adzkia ◽  
L Karlinasari ◽  
I Z Siregar
Keyword(s):  
Urban Areas ◽  
Urban Landscape ◽  
Urban Forest ◽  
Risk Mitigation ◽  
Tree Height ◽  
Leaf Sheath ◽  
Plant Management ◽  
Average Weight ◽  
Leaf Fall ◽  
Palm Trees

Abstract Royal palm is widely planted as an ornamental plant and becomes part of parks and open landscapes in urban areas, especially on the roadside and in an urban forest. The leaves have a large size that can potentially cause harm to people or property under or around the tree. Information regarding the falling period and the weight of palm leaves was necessary in terms of risk mitigation of tree management. The study was conducted on ten royal palm trees by observing the incidence of leaf fall every three days during the period of September 2019 to March 2020. The palm leaves comprise the leaf sheath and the petiole. The results showed that the number of royal palm leaves was about 12 leaves per tree. Royal palm at IPB Dramaga campus has a tree height of about 12 m and a diameter of 40 cm. The period of fall of palm leaves is 30 to 40 days; although it may not fall every period, it can even fall once in 6 months. The average weight of the fallen leaves is about 8.2 kg, with a moisture content of 85.2%. Information on the period and weight of royal palm leaf fall are very important as information on risk mitigation activities in plant management in the urban landscape.

Design Intervention Assessment of Urban Public Park for Physical Activity Promotion in Bangkok, Thailand

2020 ◽  
Vol 11 (1) ◽  
pp. 4-4
Author(s):  
Sigit Arifwidodo ◽  
Orana Chandrasiri
Keyword(s):  
Physical Activity ◽  
Urban Areas ◽  
Urban Landscape ◽  
Physical Activity Promotion ◽  
Well Being ◽  
Pilot Project ◽  
Public Park ◽  
Activity Promotion ◽  
Wide Range ◽  
Design Intervention

Public Park is considered one of the essential settings for physical activity, especially in urban areas. Parks support physical activity through their accessibility, their provision to facilitate active pursuits; their capacity to provide opportunities to a wide range of users; and their semi-permanent nature. The paper explores the design intervention assessment of Benchakitti Park, which serves as the pilot project for active park and showcase during the past ISPAH 2016 conference. The objective of the paper is to understand the health and well-being benefits of an urban park in increasing PA levels of urban population and promoting a healthy and active lifestyle. Keywords: Public park; physical activity; urban landscape design; public health; SOPARC

scholarly journals Morpho-Physio-Biochemical Attributes of Roadside Trees as Potential Tools for Biomonitoring of Air Quality and Environmental Health in Urban Areas

Land ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 236
Author(s):  
Ha Na You ◽  
Myeong Ja Kwak ◽  
Sun Mi Je ◽  
Jong Kyu Lee ◽  
Yea Ji Lim ◽  
...  
Keyword(s):  
Air Pollution ◽  
Air Quality ◽  
Environmental Health ◽  
Urban Areas ◽  
Biochemical Parameters ◽  
Lipid Peroxide ◽  
Platanus Occidentalis ◽  
Physiological Variables ◽  
Sources Of Pollution ◽  
Species Specific

Environmental pollution is an important issue in metropolitan areas, and roadside trees are directly affected by various sources of pollution to which they exhibit numerous responses. The aim of the present study was to identify morpho-physio-biochemical attributes of maidenhair tree (Ginkgo biloba L.) and American sycamore (Platanus occidentalis L.) growing under two different air quality conditions (roadside with high air pollution, RH and roadside with low air pollution, RL) and to assess the possibility of using their physiological and biochemical parameters as biomonitoring tools in urban areas. The results showed that the photosynthetic rate, photosynthetic nitrogen-use efficiencies, and photochromic contents were generally low in RH in both G. biloba and P. occidentalis. However, water-use efficiency and leaf temperature showed high values in RH trees. Among biochemical parameters, in G. biloba, the lipid peroxide content was higher in RH than in RL trees, but in P. occidentalis, this content was lower in RH than in RL trees. In both species, physiological activities were low in trees planted in areas with high levels of air pollution, whereas their biochemical and morphological variables showed different responses to air pollution. Thus, we concluded that it is possible to determine species-specific physiological variables affected by regional differences of air pollution in urban areas, and these findings may be helpful for monitoring air quality and environmental health using trees.

scholarly journals Evaluating human–coyote encounters in an urban landscape using citizen science

2020 ◽  
Author(s):  
David Drake ◽  
Shelli Dubay ◽  
Maximilian L Allen
Keyword(s):  
Citizen Science ◽  
Urban Areas ◽  
Urban Landscape ◽  
Time Of Day ◽  
Human Observer ◽  
Public Outreach ◽  
The Public ◽  
Paved Road ◽  
Almost All ◽  
Human Wildlife Conflict

Abstract Coyotes are ubiquitous in habitats across North America, including in urban areas. Reviews of human–coyote encounters are limited in scope and analysis and predominantly document encounters that tend to be negative, such as human–wildlife conflict, rather than benign experiences. The objective of our study was to use citizen science reports of human–coyote interactions entered into iNaturalist to better understand the range of first person accounts of human–coyote encounters in Madison, WI. We report 398 citizen science accounts of human–coyote encounters in the Madison area between October 2015 and March 2018. Most human–coyote encounters occurred during coyote breeding season and half of all encounters occurred in moderate development land cover. Estimated level of coyote aggressiveness varied significantly, with 90% of citizen scientists scoring estimated coyote aggression as a 0 and 7% scoring estimated aggression as a 1 on a 0–5 scale (with 0 being calm and 5 being aggressive). Our best performing model explaining the estimated distance between the human observer and a coyote (our proxy for a human–coyote encounter) included the variables distance to nearest paved road, biological season of the year relative to coyote life history, and time of day/night. We demonstrate that human–coyote interactions are regularly more benign than negative, with almost all first-hand reported human–coyote encounters being benign. We encourage public outreach focusing on practices that can foster benign encounters when educating the public to facilitate human–coyote coexistence.

scholarly journals A Modified Bare Soil Index to Identify Bare Land Features during Agricultural Fallow-Period in Southeast Asia Using Landsat 8

Land ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 231
Author(s):  
Can Trong Nguyen ◽  
Amnat Chidthaisong ◽  
Phan Kieu Diem ◽  
Lian-Zhi Huo
Keyword(s):  
Remote Sensing ◽  
Land Cover ◽  
Urban Areas ◽  
Near Infrared ◽  
Urban Landscape ◽  
Bare Soil ◽  
Critical Element ◽  
Landsat 8 ◽  
Climate Conditions ◽  
Fallow Period

Bare soil is a critical element in the urban landscape and plays an essential role in urban environments. Yet, the separation of bare soil and other land cover types using remote sensing techniques remains a significant challenge. There are several remote sensing-based spectral indices for barren detection, but their effectiveness varies depending on land cover patterns and climate conditions. Within this research, we introduced a modified bare soil index (MBI) using shortwave infrared (SWIR) and near-infrared (NIR) wavelengths derived from Landsat 8 (OLI—Operational Land Imager). The proposed bare soil index was tested in two different bare soil patterns in Thailand and Vietnam, where there are large areas of bare soil during the agricultural fallow period, obstructing the separation between bare soil and urban areas. Bare soil extracted from the MBI achieved higher overall accuracy of about 98% and a kappa coefficient over 0.96, compared to bare soil index (BSI), normalized different bare soil index (NDBaI), and dry bare soil index (DBSI). The results also revealed that MBI considerably contributes to the accuracy of land cover classification. We suggest using the MBI for bare soil detection in tropical climatic regions.

Towards an interstitial approach to urban landscape

TERRITORIO ◽  
2009 ◽  
pp. 77-82
Author(s):  
Luc Lévesque
Keyword(s):  
Urban Areas ◽  
Urban Landscape ◽  
Living Environment ◽  
Cultural Value ◽  
Shopping Centres ◽  
History Of ◽  
Western Landscape

- The history of western landscape can be conceived as the conquering of ‘non-places', by which is meant above all unknown lands with a reputation of being ‘horrendous' or uninhabitable, that are gradually brought under control, assigned a cultural value and subsequently transformed into ‘places' and landscapes. These are generic spaces without any clear history or identity. Airports, intersections and shopping centres, as well as the residual spaces associated with these, are just some examples of environments that Augé refers to as ‘non-places'. In order to breach this impasse, it becomes necessary to relinquish a privileged relationship that links one's living environment with an image of protection, the latter being associated in turn with archetypical places. By the same token, one must resist the temptation to classify an area as a ‘place' or ‘non-place' without prior examination or analysis. Various methods capable of altering our perception of urban areas can be used to set this process in motion.

scholarly journals Assessing the Potential of Nontraditional Water Sources for Landscape Irrigation

2018 ◽  
Vol 28 (4) ◽  
pp. 436-444 ◽  
Author(s):  
Raul I. Cabrera ◽  
James E. Altland ◽  
Genhua Niu
Keyword(s):  
Best Management Practices ◽  
Urban Areas ◽  
Management Practices ◽  
Urban Landscape ◽  
Biological Properties ◽  
Water Sources ◽  
Long Term Effects ◽  
Natural Ecosystems ◽  
Aesthetic Quality ◽  
The Impact

Scarcity and competition for good quality and potable water resources are limiting their use for urban landscape irrigation, with several nontraditional sources being potentially available for these activities. Some of these alternative sources include rainwater, stormwater, brackish aquifer water, municipal reclaimed water (MRW), air-conditioning (A/C) condensates, and residential graywater. Knowledge on their inherent chemical profile and properties, and associated regional and temporal variability, is needed to assess their irrigation quality and potential short- and long-term effects on landscape plants and soils and to implement best management practices that successfully deal with their quality issues. The primary challenges with the use of these sources are largely associated with high concentrations of total salts and undesirable specific ions [sodium (Na), chloride (Cl), boron (B), and bicarbonate (HCO3−) alkalinity]. Although the impact of these alternative water sources has been largely devoted to human health, plant growth and aesthetic quality, and soil physicochemical properties, there is emergent interest in evaluating their effects on soil biological properties and in natural ecosystems neighboring the urban areas where they are applied.

scholarly journals A Cultural Governance Coalition in Regeneration. A Case Study of Historical Quanzhou City

2019 ◽  
pp. 145-164
Author(s):  
Shuxiang Cai
Keyword(s):  
Public Space ◽  
Urban Areas ◽  
Land Reform ◽  
High Speed ◽  
Urban Governance ◽  
Central Government ◽  
Urban Landscape ◽  
Global Scale ◽  
Spatial Transformation ◽  
Common Path

Compared with the gradual and long exploration processes typical of European and American countries, China experienced a period marked by extremely high-speed modernisation and urbanisation, following the Land Reform. This is exemplified by a great number of urban reconstruction projects which have changed the traditional fabric of most cities. Yet, following the trend of cultural consumption since the late 1990s, numerous integrated restoration projects for historic districts were implemented to promote tourism as a promising industry to sustain economic growth. As a consequence of growth-oriented urban entrepreneurship, public spaces in these historic urban areas have also been perceptibly privatised. To a large extent, the capital and the authority of the local government directs the future prospect of the historic urban landscape in Chinese cities. On the other hand, development-oriented urban construction stimulates a rise in awareness of the need for protection strategies to conserve historic urban fabric. On a global scale, the public sector has begun to introspect on urban governance under the spirit of entrepreneurship. The urban renewal has now been extended to urban regeneration and the previous public-private partnership has been substituted with a multi-sectoral cooperative model. In recent years, the Chinese central government has proposed the core concept of “Seeing people, Seeing things, Seeing life”, which is re-orientated towards historic-city regeneration as a way of promoting “Micro-renewal and Micro-disturbance”. Among such activities, the use of exhibitions as a strategy for simultaneous spatial transformation and activation has gradually formed a common path, encouraging many cities to regenerate historic urban areas. This article is based on on this reorientation, taking Quanzhou as an example, making a critical observation on the new form of public space it has produced, and digs into the operational mechanism behind it as well as the possibility for publicness.

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