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1、第34卷第16期生態(tài)學報Vo1.34.No.162014年8月ACTAECOLOGICASINICAAug.,2014DOI:10.5846/stxb201212261870梁國付,許立民,丁圣彥.道路對林地景觀連接度的影響——以鞏義市為例.生態(tài)學報,2014,34(16):4775.4784.LiangGF,XuLM,DingSY.Impactsofroadsonwoodlandlandscapeconnectivity:acasestudyofGongyiCity。HenanProvince.ActaEcologicaSinica,2014,34
2、(16):4775—4784.道路對林地景觀連接度的影響——以鞏義市為例、梁國付,一,許立民,丁圣彥’(1.教育部黃河中下游數(shù)字地理技術(shù)重點實驗室,開封475004;2.河南大學環(huán)境與規(guī)劃學院,開封475004)摘要:基于景觀連接度原理,借用景觀連接度指數(shù),在地理信息系統(tǒng)支持下,探討了鞏義市山區(qū)林地景觀在不同距離閾值下連接度的變化,定量分析了道路對林地景觀連接度的影響。結(jié)果顯示,隨著景觀距離閾值的增大,無論是否有道路,林地景觀整體可能連通性指數(shù)值都表現(xiàn)為逐漸增大;對林地景觀連接度起“非常高”和“高”作用的林地斑塊數(shù)量都比較少,但占林地總面積比例較大,
3、面積大的林地斑塊在提高景觀連接度中起的作用較大;道路的分割使得林地斑塊重要值降低,就單一斑塊而言,隨著景觀距離閾值的增大,分割成的小斑塊的重要值降低程度在逐漸減小。關(guān)鍵詞:景觀連接度;距離閾值;可能連通性指數(shù)值;鞏義市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