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Landscape cover type and pattern dynamics in fragmented southern Great Plains grasslands, USA

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Abstract

We documented land cover and landscape pattern changes in an area of northwestern Oklahoma, USA using aerial photography from 1965, 1981, and 1995. This region of the southern Great Plains is fragmented by agricultural activity, and in recent years many remnant native grasslands have experienced extensive invasion by woody juniper (Juniperus virginiana L.). Concurrently, many cropland areas are being planted into perennial forage grasses and converted to intensively managed introduced grasslands as part of the U.S. Conservation Reserve Program (CRP). Our objectives were to document land cover and landscape pattern changes in the region relative to the expansion of juniper and CRP activity. We then examined how local landscape dominance by either anthropogenic or woody vegetation patches affected landscape pattern indices. Land cover changes from 1965 to 1995 included substantial increases in juniper woodlands and mixed woodlands that resulted from juniper encroachment into deciduous woodlands. Introduced grasslands also increased in many areas as a result of CRP implementation. Changes in landscape pattern generally reflected the influx of juniper into many areas. Landscapes dominated by woody vegetation had significantly more patches, smaller patches and patch core areas, more total edge, and higher patch diversity than landscapes dominated by anthropogenic cover types. Results indicate that expanding juniper is exacerbating the fragmentation process initiated by previous human activity, and represents a serious threat to the continued integrity and conservation of remaining southern Great Plains grasslands.

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Authors and Affiliations

  1. Division of Agricultural Sciences and Natural Resources, Oklahoma State University, Stillwater, Oklahoma, 74078, USA

    Bryan R. Coppedge, David M. Engle, Samuel D. Fuhlendorf, Ronald E. Masters & Mark S. Gregory

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  1. Bryan R. Coppedge
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  2. David M. Engle
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  3. Samuel D. Fuhlendorf
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  4. Ronald E. Masters
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  5. Mark S. Gregory
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Correspondence to Bryan R. Coppedge.

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Coppedge, B.R., Engle, D.M., Fuhlendorf, S.D. et al. Landscape cover type and pattern dynamics in fragmented southern Great Plains grasslands, USA. Landscape Ecol 16, 677–690 (2001). https://doi.org/10.1023/A:1014495526696

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