简介:芒麦草是一种外来入侵植物,在我国的分布范围随时间推移呈现不断扩大的趋势。通过对文献、网络资料的整理并结合实地调查案例,汇总了芒麦草目前的分布状况。结果表明:芒麦草已经在我国10个省(包括直辖市和自治区)22个市有自然分布。芒麦草具有很强的繁殖能力、适应性和竞争能力,容易在入侵生境中建植、扩繁、归化,进而发展成为入侵植物。通过对芒麦草入侵地和原产地生境类型的比较发现,芒麦草容易在受到人为干扰或者人为活动频繁的生境中建植,结合芒麦草生物学和生态学方面的特征,对其进行风险评估。欧洲风险评估体系(WG-WRA)中,芒麦草的入侵风险评估分值为28分,入侵等级为高度入侵风险Ⅲ;澳大利亚风险评估体系(WRA)中,其入侵风险评估分值为21分,对农业和环境的分值分别为13分和10分,是一种具有高度入侵风险的植物,需要加强预警工作和引起相关部门的重视。
简介:SulfatecanbeactivatedbyATPsulfurylaseandadenosine5’-phosphosulfatekinase(APSK)invivo.RecentstudiessuggestedthatAPSKinArabidopsisthalianaregulatedthepartitionbetweenAPSreductionandphosphorylationanditsactivitycanbemodulatedbycellularredoxstatus.InordertostudyregulationofAPSKinrice(OsAPSK),OsAPSK1genewasclonedanditsactivitywasanalyzed.OsAPSK1C36andC69werefoundtobetheconservedcounterpartsofC86andC119,whichinvolvedindisulfideformationinAtAPSK.C36A/C69AOsAPSK1doublemutationwasmadebysitedirectedmutagenesis.OsAPSK1anditsmutantwereprokaryoticallyover-expressedandpurified,andthenassayedforAPSphosphorylationactivity.OsAPSK1activitywasdepressedbyoxidizedglutathione,whiletheactivityofitsmutantwasnot.Furtherstudiesinthecasethatoxidativestresswillfluctuateinvivo3’-phosphoadenosine-5’-phosphosulfatecontent,andallAPSKisoenzymeshavesimilarregulationpatternsarenecessarytobeperformed.
简介:Background:Theglobalsearchfornewwaystosequestercarbonhasalreadyreachedagriculturallands.Suchlandconstitutesamajorpotentialcarbonsink.Theproductionofhighvaluetimberwithinagroforestrysystemscanfacilitateanin-situcarbonstoragefunction.Thisisfollowedbyapotentiallongtermex-situcarbonsinkwithinlonglastingproductssuchasveneerandfurniture.Forthispurposewildcherry(PrunusaviumL.)isaninterestingoptionformiddleEurope,yieldinghighpricesonthetimbermarket.Methods:Atotalnumberof39wildcherryweresampledin2012and2013toassesstheleaflessabovegroundbiomass.Thecompletetreesincludingstemandbrancheswereseparatedinto1cmdiameterclasses.Woodandbarkfromsub-sampleswereanalysedseparatelyandnutrientcontentwasderived.Modelsforbiomassestimationwereconstructedforalltreecompartments.Results:Thesmallestdiameterclassespossessthehighestproportionofbarkduetosmallercrosssectionalarea.Treeboleswithagreateramountofstemwoodabove10cmindiameterwillhaveamoreconstantbarkproportion.Totalbranchbarkproportionalsoremainsrelativelyconstantaboved_(1.3m)measurementsof8cm.Abalanceisevidentbetweentheproductionofnewbrancheswithalowdiameterandhighbarkproportionoffsetbythethickeningandarelativereductioninbarkproportioninlargerbranches.Theresultsshowthatasingletreewithanageof17and18yearscanstoreupto85kgofcarbonwithintheabovegroundbiomassportion,anamountthatwillincreaseasthetreematures.Branchesdisplaygreaternutrientcontentthanstemsectionspervolumeunitwhichcanbeattributedtoagreaterbarkproportion.Conclusions:Usingthederivedmodelsthecarbonandthenutrientcontentofabove-groundwoodybiomassofwholetreescanbecalculated.Suggestedvaluesforcarbonwithothermajorandminornutrientsheldwithinrelativelyimmaturetreesstronglysupportstheideaoftheinclusionofwildcherrywithinagroforestrysystemsasan
简介:月季花是园林绿化中非常重要的观赏花卉,品种和类型均十分丰富,然而受地域环境的影响,北京的寒冬限制了很多品种的应用。为了筛选出更多能够适应北京气候特点可在城市园林应用的新型月季品种。在引种观察的基础上,通过电导率的测定和Logistic方程拟合半致死温度对其中5个优良月季品种的耐寒性进行了进一步的测定与评价。结果发现:杂交玫瑰品种‘HuzelLeRougetel’的耐寒能力与对照品种IR,xanthina黄刺玫接近,是被试品种中耐寒能力最好的品种,其次地被类型的‘Grouse’耐寒能力也较强。灌丛型品种‘PalmengarienlFranfurts’再次之,古老品种‘BIoomfield’的耐寒性最差。除古老月季品种外其他的3个月季品种在北京园林中均能够安全越冬,其中应用前景最好的品种为‘HuzelLeRougetet’。
简介:目的观察5年生种植人参原粉、水提物和醇提物长期应用对小鼠学习记忆的影响,为人参的食用提供实验依据。方法正常成年昆明小鼠140只,雌雄各半,体重18~22g,随机分为10组,即:对照组,5年生种植人参原粉小、中、大剂量(0.25、0.5、1.0g生药/kg)组,5年生种植人参水提物小、中、大剂量(0.25、0.5、1.0g生药/kg)组,5年生种植人参醇提物小、中、大剂量(0.25、0.5、1.0g生药/kg)组,每组14只,连续灌胃给药3个月后进行亚硝酸盐致记忆巩固障碍实验及乙醇致记忆再现障碍实验。结果在亚硝酸盐致记忆巩固障碍和乙醇致记忆再现障碍跳台实验中,与模型组比较,人参原粉小、中、大剂量组,人参水提物小、中、大剂量组,人参醇提物小、中及大剂量组第二天的错误次数及第二天的错误潜伏期无明显变化。结论长期食用5年生种植人参原粉、水提物及醇提物对小鼠亚硝酸盐致记忆巩固障碍及乙醇致记忆再现障碍无明显的改善作用。