Views
2 years ago

Landscape structure indices for assessing urban ecological networks

Landscape structure indices for assessing urban ecological networks

Landscape structure indices for assessing urban ecological

Landscape and Urban Planning 58 (2002) 269–280Landscape structure indices for assessing urbanecological networksEdward A. CookSchool of Planning and Landscape Architecture, Arizona State University,P.O. Box 872005, Tempe, AZ 85287-2005, USAAbstractAnalysis and planning of ecological networks is a relatively new phenomenon and is a response to fragmentation anddeterioration of quality of natural systems. In urban areas, the problems of land use intransigence, political and jurisdictionalissues create a difficult environment for implementing ecological networks. The specific questions addressed in this researchprogram revolve around the viability of planning an ecological network in an urban landscape. The development andarticulation of an ecological network plan was undertaken previously and in this paper, a series of assays of landscapestructure are used to examine the viability of an ecological network in the Phoenix, Arizona urban area. Three principalanalyses were utilized: (1) patch content analysis, (2) corridor content analysis, and (3) network structure analysis. Patch andcorridor content analyses examined the internal characteristic and immediate context for each of the 89 ecological networkelements. The network structure analysis incorporates a process for aggregating results of patch and corridor analyses andincorporates indicators that describe interrelationships between landscape elements. For each of these analyses the existingcondition was compared to the optimal plan to demonstrate the level of change that can be expected. The results andconclusions of this research are that an ecological network plan provides modest but important improvement in ecologicalsystems in the Phoenix urban area. # 2002 Elsevier Science B.V. All rights reserved.Keywords: Landscape structure; Ecological networks; Urban ecosystems; Urban greenways1. IntroductionThis paper demonstrates how landscape structurecan be used to assess the viability of urban ecologicalnetworks. Ecological networks are increasingly beingconsidered as a suitable approach to improving theecological value of urban open space systems (Cook,1991a; Cook and van Lier, 1994). The objective of thisanalysis is to measure the difference between alternativeecological network scenarios using landscapestructure indicators. Three analyses; patch contentanalysis, corridor content analysis, and network structureanalysis, are undertaken to describe differences.Patch content analysis uses indicators including patchtype, size, perimeter/area ratios, degree of naturalness,matrix utility factors, and isolation. Corridor contentanalysis uses indicators of corridor type, size, interior/upland ratios, matrix utility factors, connectivity, anddegree of naturalness. Network structure analysis usesindicators of mesh density connectivity, circuitry,matrix utility factors and degree of naturalness.An ecological network plan (Fig. 1) prepared inearlier phases of this study (Cook, 2000) includesrecommendations for establishing an ecological networkin the Phoenix, Arizona urban area. The planfocuses on three scales, landscape or regional, localor municipal, and site. At each scale optimal conditionsare described for establishment of an ecological0169-2046/02/$20.00 # 2002 Elsevier Science B.V. All rights reserved.PII: S 0169-2046(01)00226-2

Final Report - Indicators of Ecological Change - Strategic ...
Landscape Ecology Principles - River Basin Center at the University ...
Indicators of Resilience in Socio-ecological Production Landscapes ...
Measuring Landscape Fragmentation and Urban ... - nrg4sd.org
Chapter 2: Landscape Ecology and Landscape Change
Appendix K Ecological Assessment - BHP Billiton
Enhancing the Natural and Built Landscape Worldwide - Ecology ...
A Framework For Assessing and Reporting on Ecological Condition ...
Causality Assessment in an Evolving Pharmacovigilance Landscape
EPA's Clinch River Basin Watershed Ecological Risk Assessment
Ecological and vegetative indicators of tuber biomass in ...
Appendix 9 - Ecology Assessment - Holcim
Landscape management /Restoration ecology
Flora & Fauna Survey & Ecological Assessment (pdf. 5MB)
Status of ecological assessment of dredging and relocation ... - SedNet
Polycentric networks and resilience in urban systems - LTER Intranet
Assessing Urban Forest Effects and Values - Torbay Council
K Ecological Impact Assessment - Hansen Bailey
Urban Design and Landscape Concept - RTA
Landscape Ecology in a Restoration Context - ctahr
Ecological Assessment Of The Delaware Riverfront
BOOK OF ABSTRACTS - iufro landscape ecology conference
the inventory state and assessment of hungary's natural habitats in ...
Analysis of Deer Ecology and Landscape Features as Factors ...
Ecological Risk Assessment of Marine Fish Aquaculture in ... - PICES
Invasive Species Biology and Ecology in a Landscape Context