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Titolo:
A scaling rule for landscape patches and how it applies to conserving soilresources in savannas
Autore:
Ludwig, JA; Wiens, JA; Tongway, DJ;
Indirizzi:
Trop Savannas Cooperat Res Ctr, Darwin, NT 0822, Australia Trop Savannas Cooperat Res Ctr Darwin NT Australia 0822 T 0822, Australia CSIRO, Wildlife & Ecol, Darwin, NT 0822, Australia CSIRO Darwin NT Australia 0822 ildlife & Ecol, Darwin, NT 0822, Australia Colorado State Univ, Dept Biol, Ft Collins, CO 80523 USA Colorado State Univ Ft Collins CO USA 80523 iol, Ft Collins, CO 80523 USA Colorado State Univ, Grad Degree Program Ecol, Ft Collins, CO 80523 USA Colorado State Univ Ft Collins CO USA 80523 col, Ft Collins, CO 80523 USA CSIRO, Wildlife & Ecol, Trop Savannas Cooperat Res Ctr, Canberra, ACT 2601, Australia CSIRO Canberra ACT Australia 2601 Res Ctr, Canberra, ACT 2601, Australia
Titolo Testata:
ECOSYSTEMS
fascicolo: 1, volume: 3, anno: 2000,
pagine: 84 - 97
SICI:
1432-9840(200001/02)3:1<84:ASRFLP>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
KAKADU-NATIONAL-PARK; NORTHERN AUSTRALIA; SEMIARID LANDSCAPES; PASTURE MANAGEMENT; EASTERN AUSTRALIA; TROPICAL SAVANNAS; MONSOON FORESTS; SPATIAL PATTERN; VEGETATION; ECOLOGY;
Keywords:
landscape ecology; land-use disturbances; resource conservation; resource patches; scaling equations; scaling functions; soil conservation; soil nitrogen;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
99
Recensione:
Indirizzi per estratti:
Indirizzo: Ludwig, JA Trop Savannas Cooperat Res Ctr, PMB 44, Darwin, NT 0822, Australia Trop Savannas Cooperat Res Ctr PMB 44 Darwin NT Australia 0822
Citazione:
J.A. Ludwig et al., "A scaling rule for landscape patches and how it applies to conserving soilresources in savannas", ECOSYSTEMS, 3(1), 2000, pp. 84-97

Abstract

Scaling issues are complex, yet understanding issues such as scale dependencies in ecological patterns and processes is usually critical if we are tomake sense of ecological data and if we want to predict how land management options, for example, are constrained by scale. In this article, we develop the beginnings of a way to approach the complexity of scaling issues. Our approach is rooted in scaling functions, which integrate the scale dependency of patterns and processes in landscapes with the ways that organisms scale their responses to these patterns and processes. We propose that such functions may have sufficient generality that we can develop scaling rules-statements that link scale with consequences for certain phenomena in certain systems. As an example, we propose that in savanna ecosystems, there is a consistent relationship between the size of vegetation patches in the landscape and the degree to which critical resources, such as soil nutrients or water, become concentrated in these patches. In this case, the features of the scaling functions that underlie this rule have to do with physical processes, such as surface water flow and material redistribution, and the ways that patches of plants physically "capture" such runoff and convert it into plant biomass, thereby concentrating resources and increasing patch size. To be operationally useful, such scaling rules must be expressed in waysthat can generate predictions. We developed a scaling equation that can beused to evaluate the potential impacts of different disturbances on vegetation patches and on how soils and their nutrients are conserved within Australian savanna landscapes. We illustrate that for a 10-km(2) paddock, givenan equivalent area of impact, the thinning of large tree islands potentially can cause a far greater loss of soil nitrogen (21 metric tons) than grazing out small grass clumps (2 metric tons). Although our example is hypothetical, we believe that addressing scaling problems by first conceptualizingscaling functions, then proposing scaling rules, and then deriving scalingequations is a useful approach. Scaling equations can be used in simulation models, or (as we have done) in simple hypothetical scenarios, to collapse the complexity of scaling issues into a manageable framework.

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Documento generato il 04/07/20 alle ore 14:29:27