Urban influence on changes in linear forest edge structure

Chant, Tim De; Hernando, Ana; Velázquez, Juan J. L.; Kelly, Maggi

doi:10.1016/j.landurbplan.2010.01.006

Cited by 41 publications

(13 citation statements)

References 64 publications

(68 reference statements)

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“…In forest science, OBIA approaches have been used with fine-scale imagery for forest type mapping and stand delineation [60,[67][68][69][70][71], and to track disturbances and forest change [19,21,72]. Many of these examples use optical imagery alone, without lidar.…”

Section: Object-based Image Analysis and Forest Sciencementioning

confidence: 99%

Object-Based Image Analysis of Downed Logs in Disturbed Forested Landscapes Using Lidar

2011

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Downed logs on the forest floor provide habitat for species, fuel for forest fires, and function as a key component of forest nutrient cycling and carbon storage. Ground-based field surveying is a conventional method for mapping and characterizing downed logs but is limited. In addition, optical remote sensing methods have not been able to map these ground targets due to the lack of optical sensor penetrability into the forest canopy and limited sensor spectral and spatial resolutions. Lidar (light detection and ranging) sensors have become a more viable and common data source in forest science for detailed mapping of forest structure. This study evaluates the utility of discrete, multiple return airborne lidar-derived data for image object segmentation and classification of downed logs in a disturbed forested landscape and the efficiency of rule-based object-based image analysis (OBIA) and classification algorithms. Downed log objects were successfully delineated and classified from lidar derived metrics using an OBIA framework. 73% of digitized downed logs were completely or partially classified correctly. Over classification occurred in areas with large numbers of logs clustered in close proximity to one another and in areas with vegetation and tree canopy. The OBIA methods were found to be effective but inefficient in terms of automation and analyst's time in the delineation and classification of downed logs in the lidar data.

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Section: Object-based Image Analysis and Forest Sciencementioning

confidence: 99%

Object-Based Image Analysis of Downed Logs in Disturbed Forested Landscapes Using Lidar

2011

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“…Among the causes of deforestation, the expansion of urban areas in the last 50 years requires special consideration (Chant 2010). Recent studies have identified the effects of landscape fragmentation on several natural processes, including changes in seed flow due to an overall reduction in dispersal agents (Melo et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Seed rain in areas with and without bamboo dominance within an urban fragment of the Atlantic Forest

et al. 2014

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Understanding the flow of diaspores is fundamental for determining plant population dynamics in a particular habitat, and a lack of seeds is a limiting factor in forest regeneration, especially in isolated forest fragments. Bamboo dominance affects forest structure and dynamics by suppressing or delaying the recruitment of and colonization by tree species as well as by inhibiting the survival and growth of adult trees. The goal of the present study was to determine whether dominance of the bamboo species Aulonemia aristulata (Döll) McClure in the forest understory influences species abundance and composition. We examined the seed rain at two noncontiguous sites (1.5 km apart) within an urban forest fragment, with and without bamboo dominance (BD+ and BD− areas, respectively). Sixty seed traps (0.5 m 2 , with a 1-mm mesh) were set in the BD+ and BD− areas, and the seed rain was sampled from January to December 2007. Diaspores were classified according to dispersal syndrome, growth form and functional type of the species to which they belonged. There were significant differences between the two areas in terms of seed density, species diversity and dispersal syndrome. The BD+ area showed greater seed density and species diversity. In both areas, seed distribution was limited primarily by impaired dispersal. Bamboo dominance and low tree density resulted in fewer propagules in the seed rain. Our results suggest that low availability of seeds in the rain does not promote the maintenance of a degraded state, characterized by the presence of bamboo.

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“…Urbanization is the process of converting forest lands into developed areas of multiple uses (Chant et al, 2010). This process may alters forest structure by favoring exotic species invasion and changing the gap phase dynamics (Cilliers et al, 2008;Mckinney, 2002;Vallet et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

The potential of the soil seed bank for the regeneration of a tropical urban forest dominated by bamboo

Vinha¹,

Alves²,

Zaidan³

et al. 2011

Landscape and Urban Planning

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Urban influence on changes in linear forest edge structure

Cited by 41 publications

References 64 publications

Object-Based Image Analysis of Downed Logs in Disturbed Forested Landscapes Using Lidar

Object-Based Image Analysis of Downed Logs in Disturbed Forested Landscapes Using Lidar

Seed rain in areas with and without bamboo dominance within an urban fragment of the Atlantic Forest

The potential of the soil seed bank for the regeneration of a tropical urban forest dominated by bamboo

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