土地生态安全评价与障碍因子诊断——以河南省周口市为例樊鹏飞\段鹏辉\刘志丹\彭宏杰\梁流涛h2121.河南大学环境与规划学院，河南开封4750042.河南大学黄河屮下游数字地理技术教冇部重点实验室，河南开封475004摘要：为探究粮食生产核心区内土地生态安全状况及其障碍因子，破解河南省三人M家战略规划实施过程中的土地W境提供支持。本文采用改进PSR模型、相对熵赋权法、障碍冈子诊断模型对河南钳周口市的土地生态进行评价与障碍因子分析。结果表明：(1)12年间系统压力呈现缓慢上升-快速下降-逐渐上升的变化趋势;系统状态呈现快速下降-逐渐上升-缓慢卜'降的变化态势：系统响应与系统压力呈现出拉锯式循环增减变化态势;系统综合指数从2001年的0.3456下降到2003年的0.3230,又快速上升到2009年的0.4534，再缓慢下降到2012年的0.4394,相应的安全等级也经历了从敏感级到一般安余级再到临界安伞级的倒“U”型变化；(2)有55.5%的障碍因子集中在系统压力层，主要障碍因子ti,括人均耕地、地均化肥和农药负荷、农林水务和环保治理支出比重等指标。研究地域和研究方法的创新丰富了土地生态安全评价研究，为类似区域提供参考借鉴；河歯省土地中态安伞保护必须从系统压力入手，以构筑绿色和谐的W土空M格局为若眼点，以转变经济发展7/忒为落脚点，以增加“三农’’和环保项11的财政文持为发力点，走一条不以牺牲粮食生产和生态环境的“三化”协调“五化”同步之路。关键词：土地生态安全；改进PSR模型；障碍度;周口市中图法分类号：F323.21文献标识码：A文章编号：1000-2324(2016)02-0000-07EvaluationandDiagnosisonLandEco-securityandObstacleFactorsTakingZhoukouCityofHenanProvinceasacaseFANPeng-fei1，DUANPeng-hui1，LIUZhi-dan1,PENGHong-jie1，LIANGLiu-tao121.CollegeofEnvironmentandPlanning/UenanUniversity,Kaifeng475004,China2.KeyLaboratoryofGeospatialTechnologyforMiddleandLowerYellowRiverRegionsofEducationMinistry,HenanUniversity,Kaifeng475004,ChinaAbstract:Toexplorethesituationoflandeco-securityanditsobstaclefactorsinthecoreareaofgrainproduction,andprovidesupportforthelanddilemmainimplementationprocessofthethreenationalstrategicplanningofHenanProvince.ThispapertookmethodsincludingtheimprovedPSRmodel,relativeentropyweightmethodandobstaclefactordiagnosismodel.Theresultshowedthat:(l)Pressindexshowedagraduallyrise-rapidfall-graduallyrisefluctuationtrendsduring12years;Stateindexshowedarapiddecline-graduallyincrease-slowlydownwardtrends;Responseindexandthepressindexshowedaseesawcirculationtrends;Compositeindexdecreasedfrom0.3456in2001to0.3230in2003,thenquicklyincreasedto0.4534in2009,finallydropto0.4394in2012.Thesecuritylevelsalsoexperiencedfromsensitivetogeneralsafetylevelthenbecamecriticsafetylevel—presentedainvertedUshapechange.(2)Theobstaclefactorsmainlyconcentratedinthesystempressurelayer.Itincludedthepercapitalcultivatedland，fertilizerandpesticideload,theproportionofagricultureandenvironmentalprotectionspending.Itconcludedthattheinnovationofregionandmethodsnotonlyenrichedthestudyoflandeco-securityevaluation,butalsoprovidedareferenceforthesimilarregions.HenanProvincemuststartfromthesystempressuretoconstructgreenandharmoniouslandspatialpatterns，enlargefinancialsupporttothe"threerural"andenvironmentalprotectionandtransformeconomicdevelopingmode.Itshouldexploitapathofthree-agriculturecoordinationandfive-orientedsynchronizationratherthandiditatthecostofgrainproductionandtheecologicalenvironment.Keywords:Evaluationoflandeco-security;improvedPSRmodel;obstacledegree;ZhoukouCity土地是人类赖以生存和发展的基础［1］，健康的土地生态系统关系到国家的政治安全、经济安全、国防安全和人民生存安全［2］。土地生态...