简介:火的相互作用骑车,植物硬币的繁殖特征能决定一处风景的植被分发模式。在加拿大的北方的区域,火在小冰川期前骑车(c。1850年代)以后从30-130年和25-234年直到解决时期(c。1930年代)什么时候更长发射周期,响应气候变迁和人的干扰发生了。分析显示火周期与生长期(4月10月)被相关从1961-1990正常的温度和降水离开,由区域变化。假设野火将在过去的世纪,用气候变迁情形CGCM1的一个评价,CGCM2和HadCM2期间对类似于方式的温暖的未来作出回应显示周期将在西方泰加森林盾转移到80-140年的一个范围的火,为北方的盾和东方泰加森林防护的东方的超过700年,和为在2050的北方的平原的300-400年。
简介:TheapplicationofGeographicInformationSystem(GIS),RemoteSensing(RS)andGlobalPositionSystem(GPS)intheresearchofforestlandscapeisoutlinedinthispaper.Theintegrationofthe3Stechniqueisalsodescribed.Inthe3Ssystem,RSisusedtoobtainthevariousinformationofforestlandscape.GPSisusedtoobtainthegrounddataoforientationandguidethepeopletothedifferentplaces.AndGISisusedininformationmanagementandprocessing.
简介:Usingthemulti-temporalLandsatdataandsurveydataofnationalresources,theauthorsstudiedthedynamicsofcultivatedlandandlandcoverchangesoftypicalecologicalregionsinChina.TheresultsofinvestigationshowedthatthewholedistributionofthecultivatedlandshiftedtoNortheastandNorthwestChina,andasaresult,theecologicalqualityofcultivatedlanddroppeddown.TheseacoastandcultivatedlandintheareaofYellowRiverMouthexpandedbyanincreasingrateof0.73km?a-1,withadepositingrateof2.1km?a-1.ThedesertificationareaofthedynamicofHorqinSandyLandincreasedfrom60.02%ofthetotallandareain1970sto64.82%in1980sbutdecreasedto54.90%inearly1990s.AstothechangeofNorthTibetlakes,thewaterareaoftheNamuLakedecreasedby38.58km2fromyear1970to1988,withadecreasingrateof2.14km2?a-1.
简介:Weusedgeographicinformationsystemapplicationsandstatisticalanalysestoclassifyyoung,prematureforestareasinsoutheasternGeorgiausingcombineddatafromLandsatTM5satelliteimageryandgroundinventorydata.Wedefinedprematurestandsasforestswithtreesupto15yearsold.Weestimatedtheprematureforestareasusingthreemethods:maximumlikelihoodclassification(MLC),regressionanalysis,andk-nearestneighbor(kNN)modeling.Overallaccuracy(OA)ofclassifyingtheprematureforestusingMLCwas82%andtheKappacoefficientofagreementwas0.63,whichwasthehighestamongthemethodsthatwehavetested.ThekNNapproachrankedsecondinaccuracywithOAof61%andaKappacoefficientofagreementof0.22.RegressionanalysisyieldedanOAof57%andaKappacoefficientof0.14.WeconcludethatLandsatimagerycanbeeffectivelyusedforestimatingprematureforestareasincombinationwithimageprocessingclassifierssuchasMLC.
简介:从纯carrageenans获得的Oligo-carrageenans(OC)从海洋的红水藻提取了由在烟草植物和桉树类树提高光合作用和基础新陈代谢刺激生长。另外,OC刺激第二等的新陈代谢,增加涉及对病原体的防卫的代谢物的水平。在这个工作,我们在高度的增加以后分析了OCkappa的效果,在涉及碳,氮和硫吸收的基础新陈代谢酶的活动,ribulose1,5biphosphatecarboxylase/oxygenase(rubisco),glutamate脱氢酶(GDH)和O-acetylserinethiol-lyase(OASTL),并且在支持生长的荷尔蒙,植物生长素吲哚醋酸(IAA)和在松(Pinusradiata)的赤霉素GA3,的水平,树在1和5的集中与OC对待kappa?mg?mL在1点与OCkappa对待的松?mg?mL1在高度显示出类似的增加,但是显示一更高比在5点与OCkappa对待的那些在IAA和GA3的全部的叶绿素,rubisco的活动,GDH和OASTL和水平增加了?mg?mL1。因此,OCkappa刺激生长和基础新陈代谢并且在松树上增加支持生长的荷尔蒙的水平,主要在1点?mg?mL1。
简介:Chinaisgloballyacknowledgedas'KingdomofBamboo',andZhejiangProvinceisnationallyrecognizedasthefirstprovinceofbambooinChina.SystematicandoverallanalysisismadebytheapproachofcasestudyonwhyZhejiangcangetsuchamarvelousachievementsoastoprovidesignificantreferencesandinstructionsforbamboodevelopmentforothercountrieswhodesiretolearntechnologiesandknow-howfromChina.Themaincontributionsareconcludedasbelow:1)Quickprogressofbambootechnologyprovidesastrongback-upforbambooindustrydevelopment;2)Governmentalsupportspromotethebalanceddevelopmentofbambooindustry,includingfavorablepolicy,financialsupport;3)Goodrelationofbamboocultivationandprocessing;4)Specialsoci-economicandhumanitarianadvantagesforbamboodevelopment,includinggoodexportenvironment,dynamicprivateeconomy,bambooindustryzone,excellenttalentsofbamboo;and5)Quickexpansionofinternationalanddomesticbamboomarketstimulatesanddrivesthedevelopmentofbambooindustry
简介:本标准代替GB/T17160-1997《1:500、1:1000、1:2000地形图数字化规范》。