简介：本文首先介绍了中国土地荒漠化现状及其成因．提出了中国在防治荒漠化工作中所采取的主要战略措施，其中包括：（１）通过大众传媒加强荒漠化防治的宣传与教育力度；（２）加强法制教育和执法力度，进一步完善各项法律、法规；（３）通过加强先进科学技术推广与人员培训，促进荒漠化防治工作、巩固成效；（４）制定优先政策，加大投资力度，促进荒漠化防治工作的大力发展．最后，本文介绍了中国荒漠化防治的最新进展．

简介：Forestcertificationhasdevelopedveryquicklyacrosstheworldasoneofthemostimportantmarketinitiativetopromotesustainableforestmanagement(SFM).Itssuccessandeffectivenessareinfluencedbysomekeyfactors,includingcredibility,costeffectiveness,certificationstandard,effectiveness,equitableness,government'sroleandlaws/regulationsframework.ThepaperanalyzedthesekeyfactorstothesuccessofforestcertificationandputforwardrelevantsuggestionsandadvicesforChinatod...

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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.

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简介：<正>梨枣是大枣资源中的名贵稀有品种,由于其接芽十分短缺,合阳县林业科技中心采用“二级跳”法繁育梨枣苗,大大加快了繁殖速度,使一个接芽当年即可嫁接繁育50多株苗木。方法如下:1.一级育苗。主要为二级育苗提供接穗。选择生长旺盛的酸枣或大枣做砧木,在4月下旬至5月中旬枣树树液流动期间进行劈

简介：小直缘跳甲(OphrideParuaChenetZia)是橄榄树的主要害虫之一。在潮阳、普宁、揭西、揭东、潮安、饶平等县(市)的橄榄园中均有发生,受害株率高达82%。小直缘跳甲以成虫、幼虫取食橄榄的小叶造成危害。成虫取食橄榄小叶的叶肉,被害后的小叶剩下叶脉,凋萎脱落。幼虫取食春、秋梢嫩叶,嫩小的小叶可全片被吃光,较老的小叶也只取食叶肉而剩下叶脉,受害后的春、秋梢呈现枯萎状,丧失开花结果能力。橄榄树反复遭受小直缘跳甲的危害,造成大量枯枝直至整株死亡。鉴于小直缘跳甲在潮汕地区的橄榄园中危害严重,给果农造成重大经济损失,笔者采用室内饲养、林间定点观察和林间防治试验等方法,对其生物学特性和防治技术进行了研究,现将结果报导如下:一、形态特征小直缘跳甲在昆虫分类上,隶属于鞘翅目,甲虫科,跳甲属。成虫:褐色,体长

简介：HuoshanChina-NetherlandsPovertyAlleviationProjectisanintegratedpovertyreliefprojectassistingHuoshanCountyofAnhuiProvincebyNetherlandsgovernment.Itwasstartedin1998withadurationof5years.Thewholeprojectwillpersistinabasicthoughtofpatticipatorythinking,s...