简介:※《广东省湿地资源及保护利用对策研究》软科学研究成果通过评审。由汕头市林科所主持完成的软科学研究项目《广东省湿地资源及保护利用对策研究》,于2004年12月21日,通过由省科技厅组织,市科技局主持的软科学研究成果评审。评审委员会由华南农业大学、广东省林科院、广东省林业调查规划院等单位的8位专家组成。评审委员会一致认为:该成果达到国内同类研究的先进水平,
简介:棕榈藤作为热带、亚热带植物中重要的森林资源,优质的藤材是重要的加工利用材料,具有重要的经济价值。叶片光合能力对藤材的形成具有重要影响,利用叶绿素荧光仪测定黄藤(Daemonoropsjenkinsiana)、大白藤(Calamusfaberii)、小白藤(C.balansaeanus)的叶绿素荧光参数,为研究逆境条件下棕榈藤的光合能力和选择适宜的栽培条件提供参考。结果表明,在实验室条件下3种棕榈藤的光系统Ⅰ(PSⅠ)实际光量子效率Y(Ⅰ)为小白藤〉大白藤〉黄藤,光系统Ⅱ(PSⅡ)的Y(Ⅱ)为大白藤〉黄藤〉小白藤;非光化学猝灭系数qN由高到低依次为大白藤、黄藤和小白藤;而光化学猝灭系数q_P则是小白藤最高,黄藤次之,大白藤最低;PSⅠ的电子传递效率ETR(Ⅰ)是小白藤〉大白藤〉黄藤,而PSⅡ的ETR(Ⅱ)值则是小白藤〉黄藤〉大白藤;PSⅡ最大光量子产量F_v/F_m维持在0.78~0.8范围内,且大白藤显著高于黄藤和小白藤(P〈0.05)。由此可见,在实验室条件下小白藤的光合效率在这3种藤中最高,其次为黄藤,大白藤最低;且光保护能力为大白藤最高,黄藤次之,小白藤最低。
简介:Background:Monitoringforesthealthandbiomassforchangesovertimeintheglobalenvironmentrequirestheprovisionofcontinuoussatelliteimages.However,opticalimagesoflandsurfacesaregenerallycontaminatedwhencloudsarepresentorrainoccurs.Methods:Toestimatetheactualreflectanceoflandsurfacesmaskedbycloudsandpotentialrain,3DsimulationsbytheRAPIDradiativetransfermodelwereproposedandconductedonaforestfarmdominatedbybirchandlarchinGenheCity,DaXing’AnLingMountaininInnerMongolia,China.Thecanopyheightmodel(CHM)fromlidardatawereusedtoextractindividualtreestructures(location,height,crownwidth).Fieldmeasurementsrelatedtreeheighttodiameterofbreastheight(DBH),lowestbranchheightandleafareaindex(LAI).SeriesofLandsatimageswereusedtoclassifytreespeciesandlandcover.MODISLAIproductswereusedtoestimatetheLAIofindividualtrees.CombiningalltheseinputvariablestodriveRAPID,high-resolutionopticalremotesensingimagesweresimulatedandvalidatedwithavailablesatelliteimages.Results:Evaluationsonspatialtexture,spectralvaluesanddirectionalreflectancewereconductedtoshowcomparableresults.Conclusions:Thestudyprovidesaproof-of-conceptapproachtolinklidarandMODISdataintheparameterizationofRAPIDmodelsforhightemporalandspatialresolutionsofimagereconstructioninforestdominatedareas.
简介:TheapplicationofGeographicInformationSystem(GIS),RemoteSensing(RS)andGlobalPositionSystem(GPS)intheresearchofforestlandscapeisoutlinedinthispaper.Theintegrationofthe3Stechniqueisalsodescribed.Inthe3Ssystem,RSisusedtoobtainthevariousinformationofforestlandscape.GPSisusedtoobtainthegrounddataoforientationandguidethepeopletothedifferentplaces.AndGISisusedininformationmanagementandprocessing.