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时间:2020-05-20
《道路对林地景观连接度的影响——以巩义市为例-论文.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第34卷第16期生态学报Vo1.34.No.162014年8月ACTAECOLOGICASINICAAug.,2014DOI:10.5846/stxb201212261870梁国付,许立民,丁圣彦.道路对林地景观连接度的影响——以巩义市为例.生态学报,2014,34(16):4775.4784.LiangGF,XuLM,DingSY.Impactsofroadsonwoodlandlandscapeconnectivity:acasestudyofGongyiCity。HenanProvince.ActaEcologicaSinica,2014,34
2、(16):4775—4784.道路对林地景观连接度的影响——以巩义市为例、梁国付,一,许立民,丁圣彦’(1.教育部黄河中下游数字地理技术重点实验室,开封475004;2.河南大学环境与规划学院,开封475004)摘要:基于景观连接度原理,借用景观连接度指数,在地理信息系统支持下,探讨了巩义市山区林地景观在不同距离阈值下连接度的变化,定量分析了道路对林地景观连接度的影响。结果显示,随着景观距离阈值的增大,无论是否有道路,林地景观整体可能连通性指数值都表现为逐渐增大;对林地景观连接度起“非常高”和“高”作用的林地斑块数量都比较少,但占林地总面积比例较大,
3、面积大的林地斑块在提高景观连接度中起的作用较大;道路的分割使得林地斑块重要值降低,就单一斑块而言,随着景观距离阈值的增大,分割成的小斑块的重要值降低程度在逐渐减小。关键词:景观连接度;距离阈值;可能连通性指数值;巩义市Impactsofroadsonwoodlandlandscapeconnectivity:acasestudyofGongyiCity.HenanProvinceLIANGGuofu'一,XULimin,DINGShengyan1KeyLaboratoryofGeospatialTechnologyFortheMiddleandLow
4、erYellowRiverRegions,Min~tryofEducation,Kaifeng475004,China2CollegeofEnvironmentandPlanning,ltenanUniversity,Kaifeng475004,ChinaAbstract:Landscapeconnectivity,definedasthedegreetowhichthelandscapefacilitatesorimpedesthemovementoforganismsorecologicalprocessesamongpatches,hasbee
5、nwidelyrecognizedasoneofthekeyobjectivesinstudiesofforestlandscapemanagement,ecologicalconservationandconstruction.Thedispersalabilityoforganismsacrosschanginglandscapesiscriticalforlong-termbiodiversityconservation,andsuccessfuldispersaloforganismsalwaysdependsonthelandscapeco
6、nnectivity.Thelandscapefragmentationcausedbyroadshassignificanteffectsonthelandscapepatternandecologicalprocesses,suchasthemigrationofspeciesandbiodiversitymaintenanceindifferentecosystemsoflandscape.Thispaperaimstoanalysetheroadimpactonforestlandscapeconnectivityinmountainarea
7、ofGongyiCity,HenanProvince,China.Thelandscapeconnectivityisevaluatedbasedonagraph—theoryframework,inwhichagraphrepresentsalandscapeasasetofnodes(habitatpatches)connectedtosomedegreebyedgesthatjoinpairsofnodesfunctionally.Boththegraphstructureandthehabitatavailabilitymetricsprov
8、idesignificantimprovementsforanalyzinglandscapeconnect
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