Fragmented native woodlands in Snowdonia (UK): assessment and amelioration
Identifieur interne : 001406 ( Istex/Corpus ); précédent : 001405; suivant : 001407Fragmented native woodlands in Snowdonia (UK): assessment and amelioration
Auteurs : A. Gkaraveli ; J. H. Williams ; J. E. G. GoodSource :
- Forestry [ 0015-752X ] ; 2001.
Abstract
The purpose of this work was to study the landscape characteristics of the forests and woodlands in the Snowdonia National Park, North Wales (UK). Using a geographical information system, several landscape indices were calculated for the broadleaves, conifers, mixed high forest and scrub vegetation categories. A total of 3967 woodland fragments, covering an area of 216 664 ha, were analysed in terms of their area, density, degree of isolation and shape in order to understand their spatial distribution and connectivity. The analyses showed that the broadleaved habitat is dissected into a great number of patches, irregular in shape and with a mean patch size of <4 ha. Fragments of mixed forest had similar sizes and were more isolated across the landscape. Scrub contained many small and similar‐sized patches, more regular in shape. When these habitats were analysed using an edge width of 100 m,∼99 per cent of the total scrub area was found to lie within edge habitat. Conifer forest presented as a very clumped habitat containing larger patches with higher variability in size. Objective GIS simulation techniques for ameliorating this fragmentation of the broadleaves, mixed forest and scrub were demonstrated using two sites in the Park. Simulations using these techniques show that (1) conversion of conifers to broadleaves, (2) reforestation of agricultural land between woodland fragments or (3) creating buffer zones around existing woodland would considerably increase the area of interior or core habitat and connectivity between the presently fragmented native woodland.
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DOI: 10.1093/forestry/74.2.89
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Gkaraveli</name><affiliation><mods:affiliation>School of Agricultural and Forest Sciences, University of Wales, Bangor, Gwynedd LL57 2UW, Wales</mods:affiliation></affiliation><affiliation><mods:affiliation></mods:affiliation></affiliation></author><author><name sortKey="Williams, J H" sort="Williams, J H" uniqKey="Williams J" first="J. H." last="Williams">J. H. Williams</name><affiliation><mods:affiliation>School of Agricultural and Forest Sciences, University of Wales, Bangor, Gwynedd LL57 2UW, Wales</mods:affiliation></affiliation><affiliation><mods:affiliation></mods:affiliation></affiliation></author><author><name sortKey="Good, J E G" sort="Good, J E G" uniqKey="Good J" first="J. E. G." last="Good">J. E. G. 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Using a geographical information system, several landscape indices were calculated for the broadleaves, conifers, mixed high forest and scrub vegetation categories. A total of 3967 woodland fragments, covering an area of 216 664 ha, were analysed in terms of their area, density, degree of isolation and shape in order to understand their spatial distribution and connectivity. The analyses showed that the broadleaved habitat is dissected into a great number of patches, irregular in shape and with a mean patch size of <4 ha. Fragments of mixed forest had similar sizes and were more isolated across the landscape. Scrub contained many small and similar‐sized patches, more regular in shape. When these habitats were analysed using an edge width of 100 m,∼99 per cent of the total scrub area was found to lie within edge habitat. Conifer forest presented as a very clumped habitat containing larger patches with higher variability in size. Objective GIS simulation techniques for ameliorating this fragmentation of the broadleaves, mixed forest and scrub were demonstrated using two sites in the Park. Simulations using these techniques show that (1) conversion of conifers to broadleaves, (2) reforestation of agricultural land between woodland fragments or (3) creating buffer zones around existing woodland would considerably increase the area of interior or core habitat and connectivity between the presently fragmented native woodland.</div></front></TEI><istex><corpusName>oup</corpusName><author><json:item><name>A. Gkaraveli</name><affiliations><json:string>School of Agricultural and Forest Sciences, University of Wales, Bangor, Gwynedd LL57 2UW, Wales</json:string><json:null></json:null></affiliations></json:item><json:item><name>J. H. 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Using a geographical information system, several landscape indices were calculated for the broadleaves, conifers, mixed high forest and scrub vegetation categories. A total of 3967 woodland fragments, covering an area of 216 664 ha, were analysed in terms of their area, density, degree of isolation and shape in order to understand their spatial distribution and connectivity. The analyses showed that the broadleaved habitat is dissected into a great number of patches, irregular in shape and with a mean patch size of <4 ha. Fragments of mixed forest had similar sizes and were more isolated across the landscape. Scrub contained many small and similar‐sized patches, more regular in shape. When these habitats were analysed using an edge width of 100 m,∼99 per cent of the total scrub area was found to lie within edge habitat. Conifer forest presented as a very clumped habitat containing larger patches with higher variability in size. Objective GIS simulation techniques for ameliorating this fragmentation of the broadleaves, mixed forest and scrub were demonstrated using two sites in the Park. Simulations using these techniques show that (1) conversion of conifers to broadleaves, (2) reforestation of agricultural land between woodland fragments or (3) creating buffer zones around existing woodland would considerably increase the area of interior or core habitat and connectivity between the presently fragmented native woodland.</p></abstract></profileDesc><revisionDesc><change when="2001">Published</change><change xml:id="refBibs-istex" who="#ISTEX-API" when="2016-12-22">References added</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><extension>txt</extension><original>false</original><mimetype>text/plain</mimetype><uri>https://api.istex.fr/document/4E1EDBD87512CF2D9A64CE20AB6A2694E40245C3/fulltext/txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="corpus oup" wicri:toSee="no header"><istex:xmlDeclaration>version="1.0" encoding="US-ASCII"</istex:xmlDeclaration><istex:docType PUBLIC="-//NLM//DTD Journal Publishing DTD v2.3 20070202//EN" URI="journalpublishing.dtd" name="istex:docType"></istex:docType><istex:document><article xml:lang="en" article-type="research-article"><front><journal-meta><journal-id journal-id-type="publisher-id">foresj</journal-id><journal-id journal-id-type="hwp">foresj</journal-id><journal-title>Forestry</journal-title><abbrev-journal-title abbrev-type="publisher">Forestry</abbrev-journal-title><issn pub-type="ppub">0015-752X</issn><issn pub-type="epub">1464-3626</issn><publisher><publisher-name>Oxford University Press</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.1093/forestry/74.2.89</article-id><article-id pub-id-type="other">740089</article-id><article-categories><subj-group subj-group-type="heading"><subject>Article</subject></subj-group></article-categories><title-group><article-title>Fragmented native woodlands in Snowdonia (UK): assessment and amelioration</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Gkaraveli</surname><given-names>A.</given-names></name><xref rid="AFF1">1</xref></contrib><contrib contrib-type="author"><name><surname>Williams</surname><given-names>J. H.</given-names></name><xref rid="AFF1">1</xref></contrib><contrib contrib-type="author"><name><surname>Good</surname><given-names>J. E. G.</given-names></name><xref rid="AFF2">2</xref></contrib><aff> <target target-type="aff" id="AFF1"></target><label>1</label>School of Agricultural and Forest Sciences, University of Wales, Bangor, Gwynedd LL57 2UW, Wales <target target-type="aff" id="AFF2"></target><label>2</label>Centre for Ecology and Hydrology, Bangor, Gwynedd LL57 2UP, Wales</aff></contrib-group><pub-date pub-type="ppub"><year>2001</year></pub-date><volume>74</volume><issue>2</issue><fpage>89</fpage><lpage>103</lpage><permissions><copyright-statement>Copyright Institute of Chartered Foresters 2001</copyright-statement><copyright-year>2001</copyright-year></permissions><abstract xml:lang="en"><p>The purpose of this work was to study the landscape characteristics of the forests and woodlands in the Snowdonia National Park, North Wales (UK). Using a geographical information system, several landscape indices were calculated for the broadleaves, conifers, mixed high forest and scrub vegetation categories. A total of 3967 woodland fragments, covering an area of 216 664 ha, were analysed in terms of their area, density, degree of isolation and shape in order to understand their spatial distribution and connectivity. The analyses showed that the broadleaved habitat is dissected into a great number of patches, irregular in shape and with a mean patch size of <4 ha. Fragments of mixed forest had similar sizes and were more isolated across the landscape. Scrub contained many small and similar‐sized patches, more regular in shape. When these habitats were analysed using an edge width of 100 m,∼99 per cent of the total scrub area was found to lie within edge habitat. Conifer forest presented as a very clumped habitat containing larger patches with higher variability in size. Objective GIS simulation techniques for ameliorating this fragmentation of the broadleaves, mixed forest and scrub were demonstrated using two sites in the Park. Simulations using these techniques show that (1) conversion of conifers to broadleaves, (2) reforestation of agricultural land between woodland fragments or (3) creating buffer zones around existing woodland would considerably increase the area of interior or core habitat and connectivity between the presently fragmented native woodland.</p></abstract><custom-meta-wrap><custom-meta><meta-name>hwp-legacy-fpage</meta-name><meta-value>89</meta-value></custom-meta><custom-meta><meta-name>hwp-legacy-dochead</meta-name><meta-value>Article</meta-value></custom-meta></custom-meta-wrap></article-meta><notes><p content-type="arthw-misc"> Received 19 June 2000. </p></notes></front></article></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>Fragmented native woodlands in Snowdonia (UK): assessment and amelioration</title></titleInfo><titleInfo type="alternative" lang="en" contentType="CDATA"><title>Fragmented native woodlands in Snowdonia (UK): assessment and amelioration</title></titleInfo><name type="personal"><namePart type="given">A.</namePart><namePart type="family">Gkaraveli</namePart><affiliation>School of Agricultural and Forest Sciences, University of Wales, Bangor, Gwynedd LL57 2UW, Wales</affiliation><affiliation></affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">J. 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G.</namePart><namePart type="family">Good</namePart><affiliation>Centre for Ecology and Hydrology, Bangor, Gwynedd LL57 2UP, Wales</affiliation><affiliation></affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="research-article" displayLabel="research-article"></genre><originInfo><publisher>Oxford University Press</publisher><dateIssued encoding="w3cdtf">2001</dateIssued><copyrightDate encoding="w3cdtf">2001</copyrightDate></originInfo><language><languageTerm type="code" authority="iso639-2b">eng</languageTerm><languageTerm type="code" authority="rfc3066">en</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType></physicalDescription><abstract lang="en">The purpose of this work was to study the landscape characteristics of the forests and woodlands in the Snowdonia National Park, North Wales (UK). Using a geographical information system, several landscape indices were calculated for the broadleaves, conifers, mixed high forest and scrub vegetation categories. A total of 3967 woodland fragments, covering an area of 216 664 ha, were analysed in terms of their area, density, degree of isolation and shape in order to understand their spatial distribution and connectivity. The analyses showed that the broadleaved habitat is dissected into a great number of patches, irregular in shape and with a mean patch size of <4 ha. Fragments of mixed forest had similar sizes and were more isolated across the landscape. Scrub contained many small and similar‐sized patches, more regular in shape. When these habitats were analysed using an edge width of 100 m,∼99 per cent of the total scrub area was found to lie within edge habitat. Conifer forest presented as a very clumped habitat containing larger patches with higher variability in size. Objective GIS simulation techniques for ameliorating this fragmentation of the broadleaves, mixed forest and scrub were demonstrated using two sites in the Park. Simulations using these techniques show that (1) conversion of conifers to broadleaves, (2) reforestation of agricultural land between woodland fragments or (3) creating buffer zones around existing woodland would considerably increase the area of interior or core habitat and connectivity between the presently fragmented native woodland.</abstract><note>Received 19 June 2000.</note><relatedItem type="host"><titleInfo><title>Forestry</title></titleInfo><titleInfo type="abbreviated"><title>Forestry</title></titleInfo><genre type="journal">journal</genre><identifier type="ISSN">0015-752X</identifier><identifier type="eISSN">1464-3626</identifier><identifier type="PublisherID">foresj</identifier><identifier type="PublisherID-hwp">foresj</identifier><part><date>2001</date><detail type="volume"><caption>vol.</caption><number>74</number></detail><detail type="issue"><caption>no.</caption><number>2</number></detail><extent unit="pages"><start>89</start><end>103</end></extent></part></relatedItem><identifier type="istex">4E1EDBD87512CF2D9A64CE20AB6A2694E40245C3</identifier><identifier type="DOI">10.1093/forestry/74.2.89</identifier><identifier type="local">740089</identifier><accessCondition type="use and reproduction" contentType="copyright">Copyright Institute of Chartered Foresters 2001</accessCondition><recordInfo><recordContentSource>OUP</recordContentSource></recordInfo></mods></metadata><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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