简介：土壤的描述水力的性质对环境管理重要；然而，直接测量土壤勤劳、费时间、昂贵，这很好被认出水力的性质。这份报纸考察作为一个其他的工具过去常估计土壤的pedotransfer功能(PTF)的发展水力的性质在最后二十年期间。象察觉到的卫星imagery/remote一样的现代土壤调查技术在开发PTF被使用了。比作机械学的途径，在物理性质之间的实验关系和水力的性质为预言土壤收到了宽偏爱水力的性质。许多PTF能在文学基于不同参量的功能被发现。很多个研究人员追求了能描述土壤的所有类型的水保留特征的通用功能，但是没有单个功能能被称为通用尽管货车Genuchten(VG)功能是广泛地采用的大多数。大多数报导参量的PTF集中于获得水保留的参数弄弯的VG(WRC)的评价。很多个物理、词法、化学的性质在PTF被用作预言者变量。通常，回归算法/技术(统计/神经的回归)被用于校准PTF。然而，有利用数据采矿技术的报告，例如，模式识别和基因算法。精制过去常让刻度改进PTF的精确性和可靠性的数据是批评的，这被推断。包括根均方差(RMSE)，许多统计索引同意索引(d)，最大的绝对错误(我)，吝啬的绝对错误(MAE)，决心的系数(r2)和关联系数(r)，被不同研究人员使用了评估并且验证PTF。这被说服是地点特定，对PTF的研究兴趣将继续直到通用PTF被开发并且验证。在未来研究，改进了方法将被要求从存在数据库提取信息。

简介：Asimplemethodwasdevelopedtorelatesoilsorptivitytohydraulicdiffusivityandwaterabsorptionexperimentswereconductedutilizingone-dimensionalhorizontalsoilcolumnstovalidatetherelationship.Inaddition,anestimationmethodforhydraulicdiffusivitywithdiscinfiltrometerwasdeveloped.Theresultsindicatedafavorablefitofthetheoreticalrelationtotheexperimentaldata.Also,theexperimentwithdiscinfiltrometerforestimatingthediffusivityshowedthatthenewmethodwasfeasible.

简介：Inthispaper,tenwoodyplantsgrewonthecampusoftheBeijingForestryUniversitywereselectedformeasuringhydraulicarchitectureparametersandwaterpotentialofone-year-oldtwigs.Theresultsshowthatdayandnightchangeofwaterpotentialandhydraulicarchitectureparametersappeartobeobviouslyconvextrend.Therelationshipmodelsbetweenwaterpotentialandhydraulicconductivity,specialconductivityandleafspecialconductivitywererespectivelyestablished,whichweresimulatedb...

简介：TenhealthytreespecieswithregularmanagementwereselectedonthecampusofBeijingForestryUniversity,andtheybelongtotalltree,shrubandliana,respectively.Waterpotentialandhydraulicarchitectureparametersofone-year-oldtwigsweremeasuredinsunnydayinthelasttendaysofMarchtothemiddletendaysofMayin2002.Theresultsshowthatthedailychangeinwaterpotentialoftreespeciesexaminedappearsconvex,i.e.thewaterpotentialishigherinthemorningandevening,and...

简介：Inthepaper,thehydraulicarchitectureparametersofPinustabulaeformisseedlings(4yearsold)weremeasuredbyimprovedflushingmethodundernormalwaterconditioninthegreenhouseandthebasictheoryofhydraulicarchitectureisusedtodiscusstherationalityofthepipemodel.Theresultsoftheexperimentandsimulationshowthatthedifferencesofhydraulicconductivity,specificconductivityandleafspecificconductivityisgreatindifferentstemsandbranchesofPinustabulaeformisseedlings.Thehydraulicconductivityofnon-constrictionareaishigherthanthatofconstrictionarea.Thedevotionoffunctionalxylemofstemtounitleafgrowthisnotaconstant,namely,theHubervalueisdiverse.Eventhoughthepipemodelhasbeenacceptedinsomeareas,itspreconditionisnotperfect,anditishelplessincorrectlyunderstandingtheessenceofwatertransportinseedlingsfromtheprospectiveofwaterphysiology.

简介：Saturatedhydraulicconductivity(Ks)isanimportantsoilhydraulicparameterforcharacteringtherateofwaterflowacrossthesoilsandismainlyrelatedtoitshighspatialvariability.Inasmallwatershedwiththeareaof0.27km2intheLoessPlateau,Ksof197soilsamplesunderdifferentvegetationsandlandformsweremeasured.Kshadamoderatevariabilityfortotalsamples.TheforestlandhadhighKswithlowcoefficientofvariation(CV),butthegrasslandinthewatershedbottomhadlowKswit...

简介：Apotexperimentwasconductedtoinvestigatetheeffectsofnitrogencontent[N1(nofertilizer),N2(0.15g?kg–1),andN3(0.3g?kg–1)]onthegrowthandthehydrauliccharacteristicsofpeachseedlingsunderdifferentsoilmoistureconditions(W1,W2andW3,inwhichthesoilwatercontentwas45%to55%,60%to70%,and75%to80%ofthefieldwatercapacity,respectively)byusingaspecializedhighpressureflowmeterwitharootchamberandacoupling,whichwasconnectedtoplantorgans.Leafareaandleafhydraulicconductivity(KL)increasedsignificantlyintheseedlingsbecauseofincreasedsoilmoistureandNcontent.KLincreasedwithleafarea.AlinearcorrelationwasdocumentedbetweenKLandleafarea.KLwashigherinthemorningandbegantodeclinesharplyafter16:00,atwhichKLdeclinedafteraninitialincrease.SoilmoistureandNcontentenhancedshoot(Ks)androot(Kr)hydraulicconductivities,therebyimprovingthelowsoilmoistureconditiontoalargeextent.KsandKroftheseedlingswerereducedby32%and27%respectivelyinN1,andby14.7%and9.4%,respectivelyinN2,andbothinW1,comparedwiththecontroltreatment.N3hadnosignificanteffectonKsandKrundersimilarconditions.LinearnegativecorrelationswereobservedbetweenKrandtheexcisedrootdiameteraswellasbetweenKsandtheshootstemdiameter.Theshoot-to-rootratioincreasedwithincreaseinNcontent.Theshoot-to-rootratioinN3wasincreasedby14.37%,comparedwithN1inW1aswellasby12%and4.39%inW2andW3,respectively.KnowledgeoftheeffectsofsoilmoistureandNfertilizeronhydrauliccharacteristicsandgrowthisimportant.Ourresultsprovidebasicguidelinesfortheimplementationofwater-savingirrigationandfertilizationmanagementofnurserystock.