简介：

简介：

简介：降雨，throughfall和stemflow被测量，华盖拦截损失在一个成熟衰退混血儿以内从6月22日为14个降雨事件被导出到2008年8月30日白云杉(Piceaglauca(Moench)Voss

简介：ByPRAsurveyto1245farmerhouseholdsof10keyMosobamboo(Phyllostachyspubescens)productioncounties,thesourceanddemandofthemanagementtechniquesinZhejiangwerestudied.Theconductedprincipalfactoranalysisrevealedthatexperienceandtraditionalknowledgearecurrentlymajortechnicalsourcesoffarmerhouseholds'Mosobambooforestmanagementtechniquesandthatthedemonstrativehouseholdisahighlyexpectedtechnicalsource,inwhichtheprimefactorisinterpersonaldissemination...

简介：Guggal，对西方的印度地方性的威胁的种，被拍提取当做药重要oleo-gum-resin(guggul)。然而，植物在口香糖渗出以后死。本地人使用的土生土长的拍技术在Gujarat被检验，在这些技术后面发现科学基础的印度：口香糖inducer，拍的季节，和植物的选择分开被拍。首先，Xanthomonasaxonopodispv的存在。在使用拍的口香糖暂停的commiphorae(Xac)被建立。这个细菌导致从拍的植物流着的口香糖并且以后，引起他们开死。在口香糖的Xac的人口被发现与口香糖的年龄减少。与那，新鲜口香糖增加了拍的成功。第二，本地人比较喜欢在温暖的季节期间拍，吗我们由决定Xac生长在30略潤潭慮?楤業畮慴?是最好的验证了哪个?桓杩汥慬????????????????????????楦浲獵??‰???堠湡桴浯湯獡？？

简介：InChina,PinuspumilaismainlydistributedinDaxing’anling,whilethosegrowingintheeasternDaxing’anlingareprimarilycoveredunderthejurisdictionofHuzhongForestBureau.P.pumilaisanevergreenshrub,3-6mhigh,andalwaysgrowsvigorously.Itstrunkscreepalongtheground,usually10mlongormore.Itiseasilyflammablebecauseofthelargeamountsofresinsandvolatileoilsinitsbody.Attackingforestfiresisadangerouswork,especiallyinP.pumilascrubs.ThefiresinP.pumilas...

简介：Approximating-natureforestrymanagementtechniqueapplicationresearchisdevelopedinCiinninghamialanceolataplantationfor17yearsatJiuxianForestFarminSongxiCounty,FujianProvince.TheresultsshowthatthebiodiversityoftheC.lanceolataplantationwasincreasedfrom48.5±3.3to74.6±3.3afteradoptingclose-to-natureforestrymanagementtechniques.Comparedwithconventionalmanagementmethod,thetestedforest’ssoilfertilitywasimproved:thesoilmoisture-physicalpropertiesandsoilexchangepropertieswereameliorated,thesoilnutrientcontentswereincreased;theaveragebreastheight,averagetreeheight,individualvolume,Chinesefirstandvolumeandstandtotalvolumewerepromotedby9.24%-17.64%,8.61%-17.29%,27.94%-58.46%,2.38%-28.64%and8.63%-37.55%,respectively.Theworsethesiteconditions,thegreatertheeffectindexeswithclose-to-natureforestrymanagementtechniqueswereimproved.

简介：Resonanceflexuralvibration(FastFourierTransform,FFT),ultrasonicwave(Pundit)andstresswave(Metriguard)techniqueswereexaminedasmeansofevaluatingthestaticmodulusofelasticity(MOE)andpredictingthemodulusofrupture(MOR)offinger-jointedlumberspecimensmadewithfourkindsofEucalyptus(Eucalyptus.citriodora,E.exserta,E.grandisxE.urophyllaandE.grandis).DynamicMOEwascalculatedfromfrequencyandtimeobtainedfromforcedvibrationsandsoundsinducedinthefourspeciesoffinger-jointedspecimens.ItwasfoundthatcorrelationcoefficientsbetweendensityandstaticMOEanddynamicMOEwerestatisticallysignificantatthe0.01level.AnditwasalsofoundthatthethreenondestructivetechniquescanproviderapidandaccuratemeanstodeterminetheMOE,andthedynamicMOEwasmoreaccuratetopredictstaticMOEthandensity.ButthecorrelationcoefficientbetweendynamicMOE,staticMOEandMORwerelowerthanresultsreportedbyotherresearchersforsolidwood,andwerenotstatisticallysignificant.ItcanbeconcludedthatthethreenondestructivetechniquesareusefulforevaluatingtheMOE,butnotsuitableforpredictingtheMORoffinger-jointed.

简介：Theisolation,cultureandtheactivedeterminationofpoplaricenucleationactive(INA)bacteriaandtheinoculationtestsinlaboratoryandfieldwereconducted,andthevarieties,distributionandnumberofpoplarINAbacteriaanditspathogenicityandfreezinginjurypropertyweredetermined.ThestudyresultsshowedthattheINAbacteriawidelyspreadonpoplarinNortheastChinaandcausedthefrozeninjuryforpoplarunderthefrostconditioninSpringorAutumn,whichwasthekeyfactortoinduceINAbacterialcanker.Throughevaluationandinvestigationofdifferentpoplarvarietiesandinoculationtests,finedisease-resistantvarietiesandstrainsofpoplarsuitableforNortheastChinawereselected.Furthertestsforstrongseedlingshowedthatburyingcuttingsinsandandcoveringwithplasticfilmcouldeffectivelyavoidthefrostbite,frozenanddroughtdamage,reduceINAbacteriainfection,andpromotepoplargrowth.INAbacterialcankerwasdetectedearlybyhighlyspecializedantiserumsofINAbacteriaandtheagglutinatedtestofring-shapedboundarysurface.Theinducerssuchasstreptomycin,phenylmercuricacetae,salicylicacidandheat-killedbacteriatoimmersecuttings,haveobviousinduceddisease-resistanteffect.Beforepoplarsproutedinearlyspring,throughsprayingthesolutionoffrostbiteagent,thecontroleffectalsowasobvious.