学科分类
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436 个结果
  • 简介:AsurveywascarriedoutatthelargestricecultivationareainPeninsularMalaysia,theMudariceagroecosystem.Themainobjectiveofthisstudywastodocumenttheoverallbiodiversityassociatedwiththisuniqueagroecosystembyusingacombinationofsamplingtechniquesinordertorecorddifferentgroupsoffaunaandflora.Thetotalnumberofbiotarecordedandidentifiedfromthericefieldecosystemduringthestudyperiodconsistedof46speciesofzooplankton,81speciesofaquaticinsects,5speciesofrodents,7speciesofbats,87speciesofbirds,11speciesoffishesand58speciesofweeds.Along-termstudyshouldbecarriedoutasmorespeciesareexpectedtoberecordedwhenmoreoftheMudariceagroecosystemareahasbeensampledtoobtainsufficientinformationontheMudariceagrobiodiversity.

  • 标签: 土壤生物多样性 水稻 农业生态系统 马来群岛
  • 简介:在四川盆的外部多山的区域的雨流量过程上的研究,被认为是一个关键生态的躲蔽处,将为上面的长江盆贡献洪水控制和环境保护。在二典型集水--Fujiang河集水和Wujiang河集水,降雨模拟被进行了在土地使用林地,农田和草地的三种类型学习黄壤和石灰石土壤的雨流量过程。结果证明(1)在一样以内,降雨处理,坡面漫流在农田上首先发生,然后在草地上,并且最后在林地上;(2)土壤表面范围在坡面漫流的出现和数量上有大影响。在范围以后的流量数量罐头增加2-4时间被移开;(3)因为土壤的更高的石子内容,在坡面漫流的出现前的渗入将减少,但是一旦坡面漫流变得稳定,它不在渗入上拿效果;(4)石灰石土壤林地的径恋数比黄壤林地的大,但是不到农田的;(5)三实验渗入当模特儿包括Horton'模型,Kostiakov'当模特儿,并且修改Kostiakov'当模特儿被在降雨下面使用观察结果比较模拟。结果比Horton'模特儿和修改Kostiakov当模特儿证明Kostiakov'模型更好表演了。根据这研究的结果,当水蚀在四川盆的外部多山的区域被建模时,Kostiakov的模型能被用来模仿降雨渗入。

  • 标签: 山地 四川盆地 降雨量 河流
  • 简介:Accordingtothehydrographicandsedimentdata,thedynamicsedimentationcharacteristicsaredealtwithbasedontheanalysesofthehydra-dynamicsandthesuspendedandbottomsedimentcharactersinXiashimen(XSM)straitchannelmouthareaintheeasternpartofZhoushanIslands.Itispointedoutthatbothofthechangesofthehydra-dynamicsandthefinesedimentsupplyfromChangjiangestuaryresultinthesedimentationmechanismofmainlythefinesedimentsflocculatingdepositionandsecondlythecoarsersedimentdepositioninsinglegrain.Thedynamicsedimentationcharacteristicsaredevelopedundertheactionofthedepositionmechanismandreworkingdifferencesindifferentbedformareas.

  • 标签: fine sediment FLOCCULATION in flowing water
  • 简介:AsurveywasconductedintheequatorialareaofIndianOceanforabetterunderstandingofthedynamicsofhookdepthdistributionofpelagiclonglinefishery.Wedeterminedtherelationshipbetweenhookdepthandverticalshearofcurrentcoefficiency,windspeed,hookpositioncode,sineofwindangle,sineofangleofattackandweightofmessengerweight.Weidentifiedthehookdepthmodelsbytheanalysisofcovariancewithagenerallinearmodel.TheresultsshowedthatthewindeffectonthehookdepthcanbeignoredfromOctobertoNovemberinthesurveyarea;thesurfacecurrenteffectonthehookdepthcanbeignored;theequatorialundercurrentisthekeyfactorforthehookdepthinIndianOcean;andthereisanegativecorrelationbetweenthehookdepthandverticalshearofcurrentandangleofattack.Itwasalsofoundthatthedeeperthehookwasset,thehigherhookdepthshoalingwas.Theproposedmodelimprovestheaccuracyofthepredictionofhookdepth,whichcanbeusedtoestimatetheverticaldistributionofpelagicfishinwatercolumn.

  • 标签: 赤道地区 印度洋 深度分布 远洋 建模 钓钩
  • 简介:Oil-gasremotesensinginformationisobtainedfromsatelliteTMdatathroughgraphictreatmentinthelightofthehydrocarbon-microseepagetheory.Theninetargetareas(ofthreetypes)selectedonthisbasisconcidewellwiththeoccurrenceofnaturalgasesandhavebeenprovedbysubsequentprospecting.Plantsinthetargetgreasarecharacterized.asaresultofhydrocarbon-microseepage,byabnormalspectralfeatureswiththeabsorptionpeaksofchlorophyllshiftingtowardbluelight,reflectivityintherangeofvisiblelightincreasingandreflectivityinthenearinfraredregiondecreasing.

  • 标签: 贵州 油气成因 人造卫星 赤水地区 遥感数据 天然气
  • 简介:ThispaperdiscussesthelateYanshanian-Himalayanigneousrockseriesandminerogeneticseries(Chengetal.,1979,1982)relatedtotinpolymetallicdepositsintheTengchongarea.Themulti-stagedifferentiationandevolutionoftheigneousrockseriesledtotheconcentrationofmetalandore-formingelementsinacupolaofagranitebodyformedinthelatestage.TheminerogeneticseriesshowsazoningofNb-Ta-W-Sn,Sn-FeandSnaroundthecupolainspaceandamulti-stageregularityintime.Finallyaminerogeneticmodelandthreekeyfactorsoftinminerogenesisareputforwardfortinpolymetallicdepositsinthearea.

  • 标签: GRANITE intrusion quartz HIMALAYAN rock mineralization
  • 简介:ThegeologicalstructureiscomplexintheHohhot-Baotouarea.SeveralearthquakeswithMS≥6.0haveoccurredintheareainhistory.ThisarticleselectedtheHohhot-Baotouareaasthestudyregionanddivideditinto2sub-regions,eachwithaspatialscopeof3°×2°,accordingtothespatialdistributionofML≥1.0earthquakesoccurringbetweenJanuary2001andApril2010,andthelayoutoftheseismicnetworkinthestudyregion.Averagevelocityratiosofrespectivesub-regionswerecalculated,andcomparativeanalysiswasmadeontheirtemporalandspatialvariations.Resultsshowthatthereareslightdifferencesbetweensub-regionsinthevariationamplitudeofaveragevelocityratiocurvesovertime,whichmostlyremainsbetween2.5%to2.584%.IntheHohhotarea,theaveragevelocityratiois1.722,significantlylowerthantheaveragevelocityratioof1.733intheBaotouarea.WepreliminarilyconcludedthatthiswasrelatedtothedistributionoffaultstructuresandpropertiesofundergroundmediaintheHohhotarea.

  • 标签: 呼和浩特地区 包头地区 速度比 平均 VP VS
  • 简介:Inthisarticle,werelocatedtheseismicsourcelocationoftheearthquakesintheMuliareaofSichuan,invertedthefocalmechanismofthelargerearthquakesandanalyzedtherelationshipbetweenthewaterleveloftheJinpingreservoirandthefrequencyoftheearthquakeswarm.Theresultsshowthat:(1)Theepicentersoftherelocatedsmallearthquakeswarmsaredistributedinaseismiczone,andtheearthquakefocaldepthswereintherangeof0-12km.(2)Byanalyzingtheearthquakeswarmspatialdistribution,wefoundthattheswarmsweregeneratedbyonebranchfaultonthewestofXiaojinhefault.(3)Thefocalmechanismofthethreeearthquakeswithmagnitudegreaterthan4.0issignificantlydifferent,withtheshallowsourcethrusteventsaffectedbyverticalstress,andthestrike-slipeventsarerelatedtoregionalstresstectonicactivity.

  • 标签: 小震群 四川省 活动特征 木里 地震空间分布 震源机制
  • 简介:Basedontheconceptofecosystemcarryingcapacity,theindicatorsystemofquantitativeassessmentwassetup,whichconsistedofsupportindicatorsystemandpressureindicatorsystem.Andthefactoranalysismethodwasusedtoscreentheindicatorsystem.Differentfromthetraditionalindicatorweightdeterminationbasedontheabsolutevaluesofthecoefficientsofregressionequation,thesquaresoffactorloadingsintherotatedcomponentmatrixwereattemptedtodeterminetheweightsof40assessmentindicators.TheresultshowsthatecologicalsupportsystemandpressuresysteminBinhaiNewAreaarerelativelybalancedamongsixyears,andthedevelopinglevelofurbanecosystemisbasicallyhealthyonthewhole.However,duetocontinuouslyincreasingpressureoftheresourcesconsumptioncausedbytherapidgrowthofthesecondindustry,whichistheLeadingIndustryofBinhaiNewArea,theecosystemcarryingcapacityreachedtheminimumin2005.

  • 标签: 城市生态系统 评价指标体系 滨海新区 承载能力 天津 载运
  • 简介:Emeishan洪水暗岩能被划分成high-Ti(HT)暗岩(Ti/Y>500)和low-Ti(副)暗岩(Ti/Y<500)。Sr,熔岩的Nd同位素的特征显示副--并且HT类型岩浆从不同披风来源和父母岩浆发源。TheLT类型岩浆从更浅的石版印刷被导出球的披风,而HT类型岩浆从更深的披风来源被导出,那可以是可能一根披风羽毛。然而,theEmeishan洪水暗岩上的很少研究包含了他们的Pb同位素,特别Ertan暗岩。在这篇论文,作者以Pb同位素从Ertan区域调查了暗岩样品,充满暗岩以便抑制Emeishan的来源。~(206)的比率Pb/~(204)Pb(18.31-18.41),~(207)Pb/~(204)Pb(15.55-15.56)和~(208)Pb/~(204)Pb(38.81-38.94)比弄空的披风的那些显著地高,就躺在他们Ⅰ和他们Ⅱ之间。这显示EmeishanHT暗岩(在Ertan区域)是他们Ⅰ结束成员和他们Ⅱ结束成员混合的结果。

  • 标签: 二滩地区 峨眉山洪水玄武岩 PB同位素 来源 特征 富集地幔
  • 简介:Thereisanobviousdeparturefromtheregionalequi-libriumofdevelopmentsbetweentheupperandlowerreachesofthePearlRiverinGuangdong,whichresultedin'theeffectsofcontra-geography-gradsdevelopment'.Itismainlybecausetheuprivermountainousareashavebeendeeplystuckinindustriali-zationdelayandmarginalizationplights,sothatnearly40millionlocalpeoplehaveconceivedadreamtogetridof'theviciouscircleofpoverty'byspeedingupindustrialdevelopment.Buttheproblemisthatsuchindustrializationeffortsonalargescaleinmountainousareasareencounteringthebottleneckofenviron-mentalcapacitythatstrictlylimitsindustrialemissionsalongtheupperreachesofanywatersystem.Asasolution,aninstitutionalarrangementcalled'theLocalAreaQuotasforIndustrialEmis-sionsalongthePearlRiver'isputforwardsupposedtogivecor-respondingcompensationtotherightsofindustrialdevelopmentyieldedbysomeareaswithlowerenvironmentalcapacitythroughthedistributionandtradingofIDQs.

  • 标签: 广东 工业排放物限额 区域平衡发展 河流污染 地方限额 环境保护
  • 简介:在Jianghan平凡区域的海洋的阶层广泛地从上面的Sinian与超过8,000m的全部的深度被散布到中间三叠纪。六个水库caprock单位,命名Z-€2,€2-O,S,D-C,P和T1,能与每个时代被识别。地质学,地层学,钻,油在学习区域象测量包括和锶同位素数据一样测试和另外的基本数据在Jianghan平凡区域在形成的分析和海洋的含石油的水库的进化过程被使用。这研究试图在Jianghan平原为烃的进一步的探索提供一个科学基础并且由在海洋的阶层为烃累积分析关键因素减少风险。我们在更低的Palaeozoic烃水库,油/气体移植和累积主要在早Yanshanian的早时期发生了,并且烃水库在早Yanshanian的中间迟了的时期被破坏的调查结果表演。在更低的三叠纪含碳的烃水库,油/气体移植和累积主要在早Yanshanian发生了,并且烃水库从迟了的Yanshanian承受了破坏到早Himalayanian。自从迟了的Himalayanian,在Jianghan平凡区域的海洋的阶层的保藏条件被改进了。然而,因为所有采购原料,床错过了油/气体产生高峰期并且失去了能力产生第二等的烃,烃的累积都不能在学习区域的海洋的阶层被检测。自从探索在1958开始了,没有工业上可利用的油/气体水库在Jianghan平凡区域的海洋的阶层被发现了。这研究证实在海洋的阶层的含石油的水库完全被破坏了,并且差的保藏调节,这是导致失败的烃探索的主要因素。在学习区域的海洋的阶层的烃探索是相当危险的,这安全地被结束。

  • 标签: 油气成藏过程 海相地层 江汉平原 平原地区 地层油气藏 天然气运移
  • 简介:TheMazhuangshanarealiesinnortheasttoAqikekuduke,wherearedistributedin-termediate-acidrocks,whichwereformedintheMiddle-LateCarboniferousepoch.Themagmaticrocksareperaluminousandbelongtocalcareousseries.AllvaluesofACNK(1.03-2.12),ANK(1.67-2.93),SI(4.1-33),δ(0.71-4.82),La/∑REE(0.09-0.26)∑LREE/∑HREE(1.76-11.01),(La/Sm)N(1.60-6.35),(Sm/Nd)N(0.33-0.58),(La/Yb)N(4.7-12.1),LaN/Lux(5.9-11.8),(Ce/Yb)N(3.14-6.64),δEu(0.38-1.06),RbN/SrN(41-120)andSr(0.02-0.2)demonstratetheyvarywithD_I(45-90).S-Bdiagramalsoshowsthatthelithophileelementsareabundantinacidicmagmaticrocks,Moreover,itisconcludedthattheprimitivemagmaoriginatedfromasubductionzoneatthecontinentaledge,andunderwentfractionalcrystallizationandcontamination,thengeneratedthemagmaticrocks,Themulti-cationindex(R:3055-3993,R2:286-438)showsthattheprimitivemagmaoriginatedfromthemantle,Alltheseconclusionsarebeneficialforexploringgolddepositsinthearea.

  • 标签: 天山地区 岩浆岩 结晶作用 活动大陆边缘 地质构造
  • 简介:TheCaofeidiansandbar-lagoonsystemissituatedalongthenorthwestcoastoftheBohaiSea.Thesystemhasevolvedfromtheabandoneddelta,whichcameintobeingbySuheRiverandXiaoqingheRiverinthemiddleHolocene.Atthemoment,thesystemhasalmostlostthesupplyofriversediments.(Fig.1)

  • 标签: 气芯
  • 简介:叶区域索引(LAI)是陆地表面植被系统的一个重要特征,并且也是为平衡的全球水和碳循环的模型的一个关键参数。由使用Landsat-5蓝色的反射价值,绿、红的隧道从米饭反射光谱模仿了,到LAI的乐队的敏感被分析,并且对各种各样的NDVI(规范的差别植被索引)的估计LAI的反应和能力,它被与红、绿、蓝的乐队的所有可能的联合代替一般NDVI的红乐队建立,被估计。最后,结论被米饭数据以不同条件测试。到LAI的红、绿、蓝的乐队的敏感在各种各样的条件下面是不同的。当LAI是不到3时,红、蓝的乐队对LAI更敏感。不过绿乐队在这种情况下比红、蓝的乐队对LAI不太敏感,它对在一个更宽的范围的LAI敏感。当植被索引被红、绿、蓝的乐队的各种联合组成时,为使这些的敏感成为植被的前提索引到LAI有意义是联合之一的价值比0.024大,即可见反射(力)>0.024。否则,植被索引将被浸透,导致LAI的更低的评价精确性。索引从红、绿、蓝的乐队的各种联合导出到LAI评价的植被的能力上的比较显示出那GNDVI(格林NDVI),GBNDVI(绿色蓝色的NDVI)与LAI有最好的关系。到LAI评价的GNDVI和GBNDVI的能力在不同情形下面被测试,并且一样的结果被获得。它建议了更好执行比常规NDVI预言LAI的那GNDVI和GBNDVI。

  • 标签: 植被目录 水稻 叶面积指数 反射光谱 遥感