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    Measuring Landscapes: A Planner's Handbook
    Measuring Landscapes: A Planner's Handbook
    Measuring Landscapes: A Planner's Handbook
    Ebook444 pages4 hours

    Measuring Landscapes: A Planner's Handbook

    By Andre Botequilha Leitao, Joseph Miller, Jack Ahern and Kevin McGarigal

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    About this ebook

    This practical handbook bridges the gap between those scientists who study landscapes and the planners and conservationists who must then decide how best to preserve and build environmentally-sound habitats. Until now, only a small portion of the relevant science has influenced the decision-making arenas where the future of our landscapes is debated and decided.

    The authors explain specific tools and concepts to measure a landscape's structure, form, and change over time. Metrics studied include patch richness, class area proportion, patch number and density, mean patch size, shape, radius of gyration, contagion, edge contrast, nearest neighbor distance, and proximity. These measures will help planners and conservationists make better land use decisions for the future.
    LanguageEnglish
    PublisherIsland Press
    Release dateSep 26, 2012
    ISBN9781597267724
    Measuring Landscapes: A Planner's Handbook

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      Book preview

      Measuring Landscapes - Andre Botequilha Leitao

      her.

      1

      Landscape Ecology

      A Spatial and Human-Oriented Ecology

      During the eighteenth and nineteenth centuries, many scientists developed the basis for what would become the science of ecology (Forman and Godron 1986). Haeckel introduced the term ecology in 1866, originally meaning knowledge of the house (hold) (Capra 1996), as a sister science of economy, which is literally the management (and counting) of the house (hold) (Zonneveld 1995).

      Ecology is concerned with the interactions between organisms and their environment and how those interactions determine the distribution of both plants and animals (O’Callaghan 1996).

      Ecology focuses on the study of ecosystems, and on the vertical relationships (topology) between the different components of ecosystems, such as climate, water, soil, bedrock, flora, and fauna.

      1.1. Foundations of Landscape Ecology

      Landscape ecology emerged in Europe in the 1950s and shares its heritage with the related disciplines of biogeography and ecology. One of the principal distinctions between landscape ecology and other branches of ecology is the emphasis and focus on the spatial patterning of multiple ecosystems in heterogeneous landscapes.

      Landscape ecology introduced several perspectives and principles that have become fundamental for planners. One such perspective is the spatial dimension of ecological processes. Vertical (topological) relationships are considered together with horizontal (chorological) relationships between the ecosystems that comprise a landscape. Landscape ecology offers theory and empirical evidence that enables scientists and planners to understand and compare different spatial configurations of land cover types (Forman 1995), and enables planners to anticipate and manage the ecological consequences of a plan.

      A second fundamental perspective is the focus of landscape ecology on human ecology, and on the application in planning and management. In landscape ecology, human activities are considered part of ecosystems, not as a separate component.

      A third perspective consists of adopting the landscape as the principal unit of study. Together with a systemic, holistic approach, landscape ecology provides an integrated analysis of the complex, human-made landscapes that are fast becoming dominant worldwide.

      In nature, form and function constitute a unity because they are reciprocally influential in a closely integrated relationship responsible for landscape evolution. In this context, the form and function principle is particularly useful to planning since it allows one to relate physical characteristics of the landscape and the spatial configuration of a plan with landscape functions and the processes that shape and alter those same characteristics. Although these might have slightly different meanings, land use, land cover, spatial structure, and pattern are fundamental concepts for both landscape ecologists and planners (Antrop 2001). Landscape ecologists focus on detecting structure where planners work on creating new structures. The former look at spatial patterns to learn about landscape processes and functions, the latter focus on guiding these according to planning goals (Antrop 2001).

      1.2. A Landscape Perspective

      There is enormous global diversity in landscape types, from grasslands and deserts, to forests and tundra, with many gradations between these types and the level of human activity occurring within them—activities such as agriculture, urban and suburban development, forestry, and mining. Each of these landscape types has several dimensions: ecological, economic, social, cultural, and aesthetic. Depending on one’s professional or disciplinary viewpoint, landscapes can be seen from multiple perspectives. One perspective views the visible component of the landscape, the so-called phenosystem (González Bernáldez 1981), primarily as an aesthetic phenomenon as in the seventeenth century landscape painting. Another perspective views landscapes as closer to the eyes than to the mind, more related to the heart, the soul, the moods than to the intellect (Hardt 1970 cited in Bastian 2001, 758). Others view landscape as a socio-spatial entity (Linehan and Gross 1998), or as landscape products (Taborda 2000). Others perceive landscapes as geographic surface units, focused on their natural components including: water, hills, fields, and forests (Wascher 2000). Since the beginning of the twenty-first century, the landscape concept has been evolving towards a transdisciplinary perspective (Naveh 1991; Tress and Tress 2001) (see Box 1.1).

      Box 1.1. Landscapes as Multidimensional Entities

      Landscape ecology originally focused on three landscape characteristics: structure, function, and change. And respectively on (1) the distributional patterns of landscape elements or ecosystems, (2) the flows of animals, plants, energy, mineral nutrients, and water between these elements, and (3) the ecological changes in the landscape mosaic over time. Forman and Godron (1986) defined three fundamental elements of landscape structure: patches, corridors, and the matrix. Together these constitute the widely accepted patch-corridor-matrix or mosaic model (Forman

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