简介：TheamountsofsoilnonexchangeableKextractedwith0.01mL/Loxalicacidandcitricacidsolutionsandthatwithboiling1mL/LHNO3fortenminuteswereremarkablysignificantlycorrelatedwitheachother,andtheamountextractedwiththeoxalicacidsolutionwashigherthanthatwiththecitricacidsolution.ThesoilnonexchangeableKreleasewascomprisedoftwofirst-orderkineticprocesses.ThefasteronewasascribedtotheinterlayerKinoutersphere,whilethesloweronetothatininnersphere.TherateconstantsofthesoilnonexchageableKweresignificantlycorrelatedwiththeamountsofnonexchangeableKextractedwithboiling1mL/LHNO3fortenminutes.Studyonthefitnessofdifferentkineticequationsindicatedthatthefirst-order,parabolicdiffusionandzero-orderequationscouldalldescribethereleaseofsoilnonexchangeableKwell,butElovichequationwasnotsuitabletodescribeit.

简介：钾(K)在植物影响生理的过程的一个范围并且是控制庄稼生产率和收益质量的一个关键因素。很少信息都不有关切割花植物的功能上的K营养的效果是可得到的。现在的学习被执行调查在K和N营养之间的相互作用，在花数量和毛莨属asiaticusL的质量上。植物与Kfertigation的三个层次被供应(60，120，或180mgKL−；1)不到50mgNL−；1应用，并且在120mgKL−的中间的水平；1，到N应用的三个层次(50，100，或150mgNL−；1)。二最低K治疗和最低N治疗由于更低的发生在花生产为佼佼者倒下茎，在很快扩展花茎的纸巾与局部性的Ca缺乏联系的混乱。有害效果在180mgKL−的供应下面已经以收益质量是明显的；1和50mgNL−；1，并且没在渗透的潜在的、相对的水内容或植物织物的膜稳定性与变化被联系，或与在除在高N申请下面的减少的Ca以外的叶子的矿物质内容的变化。我们的结果建议R的一个低营养的要求。asiaticusL。为K和N，在在K和N的高集中的申请下面的减少的花质量的织物水关系的参与的缺乏，和茎由Ca的减少的可获得性在N和K的高申请下面倒下到花的膨胀织物的正式就职起源。

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简介：Sulfurtransformationin3soilsmaintainedinaclosedincubationsystemanditsavailabilitytoplantswereinvestigatedusingcarrier-free^35S-SO4^2-and^35S-labeledryegrassstraw.Forcarrier-freeNa2^35SO4treatment,78%,70%and64%of^35SappliedwerefoundinCa(H2PO4)2-extractaleSfraction,4%,5%and7%inslowlysolubleinorganicS,11%,15%and18%inC-O-S,5%,7%,and6%inC-bondedS,and5%,7%and6%inunidentifiedorganicS120daysafterincubationinblacksoil,cinnamonsoilandchestnutsoil,respectively.Mostof35Suptakebyplantscamefromextractable35SO4^2-,andlittlefromC-O-^35SandC-bonded^35S,Inthetreatmentwith35S-labeledstraw,51%,46%and36%of35SincorporatedwerefoundinCa(H2PO4)2-extractableSfraction,7%,6%and7%inslowlysolubleinorganicS,13%,15%and18%inC-O-S,8%,8%and6%inC-bondedS,and18%,25%and35%inunidentifiedorganicSattheendofincubationinabove-mentonedthreesoils,respectively.HigheravailabilityofC-O-35S,C-bonded35Sandunidentifiedorganic35Sfrom35S-labeledstrawwasobservedin35S-labeledstrawtreatmentcomparedtocarrier-freeNa2^35SO4treatment.

简介：Apotexperimentwithtworice(OrizasativaL.)genotypesdifferingininternalpotassiumuseefficiency(IKUE)wasconductedunderdifferentsodium(Na)andpotassium(K)levels.AddingNaC1ataproperlevelenhancedricevegetativegrowthandincreasedgrainyieldandIKUEunderlowpotassium.AdditionofhigherrateofNaC1hadanegativeeffectonthegrowthoftheK-efficientricegenotype,butdidnotfortheK-inefficientgenotype.Underlow-Kstress,higherNaC1decreasedIKUEoftheK-efficientricegenotypebutincreasedIKUEfortheK-inefficientgenotype.Attilleringstageandunderlow-Kstress,addingNaClincreasedKandNacontentsanddecreasedtheratioofK/Naforbothgenotypes.Atharvestingstageunderlow-Kstress,addingNaG1increasedKandNacontentsandK/NaratiofortheK-efficientgenotypebutdecreasedtheK/NaratiofortheK-inefficientgenotype.TheaccumulatedNawasmostlydepositedintherootsandsheaths.Attilleringstage,theKandNacontentsandtheK/Naratiosindifferentpartsforbothgenotypesdecreasedinthefollowingsequence:K+insheaths＞K+inblades＞K+inroots;Na+inroots＞Na+insheaths＞Na+inblades;andK/Nainsheaths》K/Nainroots.TheK-efficientgenotypehadalowerK/NaratioinrootsandsheathsthantheK-inefficientgenotypeunderlow-Kstress.Atharvestingstage,KandNacontentsingrainswerenotaffected,whereasK/NaratiointhericestrawswasincreasedfortheK-efficientgenotypebutdecreasedfortheK-inefficientgenotypebyNaaddition.However,thiswasnotthecaseunderKsufficientcondition.

简介：EctomycorrhizalfungusLaccariabicolorS238N,isolatedfromaforestsoilincentralFrancein1990s,hasdemonstratedunequivocallyandabilitytopromotepinegrowth.Inthepresentnurserybedexperiment,theabilityofthisectomycorrhizalfungustoincreasegrowthandPandKuptakeofDouglasFirseedlings(Zone22)wasexamined.Growthofinoculatedseedlingswasovertwice(plantheight)andthreetimes(biomass)thatofnon-inoculatedones.Similarly,boththeconcentrationsandtheamountsofPandKuptakebyseedlingsweresignificantlyincreasedbyfungalinoculation,indicatingtheimprovementofPandKnutritioninmycorrhizalseedlings.Incontrast,Al-Pinthesoilswasdecreasedobviouslybyplants,especiallybymycorrhizas,suggestingutilizationofthissoilPpoolbyplantsandmoreefficientAl-Pmobilizationbymycorrhizasthanbynomycorrhizas.Moreover,Kextractedby1mol/LHClfollowingconsecutiveextractionofH2OandCH3COONH4,whichmaynotbeplantavailable,couldbeutilizedbyfunguscoloniedroots.ThiscouldbeexplainedbythereleaseofprotonsandoxalatebyhypaewhichleadstoreplacementofinterlayerKinnonexpanded2:1claymineralsandbio-weatheringofphyllosilicates.

简介：本文利用闽东南沿海遥感调查实例解析“3S”在水土流失遥感调查中的作用，并具体分析GIS与RS，GIS与GPS如何相互结合，为水土流失遥感调查服务。

简介：为提高大凌河流域水土流失综合防治技术水平，在水土保持信息资料收集与抽样实地调查的基础上，应用RS、GPS与GIS技术，构建大凌河流域水土保持管理信息系统。该系统不仅利用了RS技术信息丰富、宏观性强等特性，还充分发挥了GIS具有的强大空间分析和管理功能。通过高效科学的管理决策过程，为水土保持监测工作的开展奠定了扎实的数据信息基础和更新方法基础，实现全流域水土保持信息资源共享及动态更新、动态管理和动态监督，从而使辽西大凌河流域水土保持管理实现了信息化、自动化、智能化和高效化。

简介：岩溶石漠化是广西脆弱生态恢复建设中面临的突出生态环境问题.以1988、1998和2008年3个时相的TM/ETM卫星数据为主要信息源,综合碳酸盐空间分布图、石漠化状况实地调查结果和历史资料,基于3S技术,构建岩溶石漠化遥感监测和分级评价模型,研究广西平果县岩溶区石漠化空间分布特征及演变规律.结果表明：1）岩溶石漠化遥感监测和分级评价模型能够反映平果县石漠化状况,基本符合实地调查结果;2）平果县岩溶石漠化主要分布在该县西南部和中部,1988-2008年,平果县总体石漠化程度经历了稍加重然后逐渐变轻的变化趋势,石漠化呈现动态、缓慢、反复、可治理等特点.建议采取先易后难、逐步改善的治理策略.研究结果可为中国西南岩溶石漠化治理和区域生态建设的宏观决策提供参考.