简介:许多西方的美国被认为是牧场。牧场区域生产好处和产品的多样的混合,并且在生态系统上下文,他们的全面健康具有国家重要性。因为从一个分水岭的沉积产量是所有土壤的综合表情,侵蚀和沉积处理发生在它以内,我们寻求确定并且作为牧场健康的措施在土壤/地点稳定性和分水岭功能的上下文解释沉积产量,是逻辑的。综合推迟的沉积取样的深度与流量用斜槽测量了在西南的美国从二个试验性的分水岭计算输沙量和收益被相结合。为单个流量事件的沉积收益估计被加从这二个牧场分水岭生产年度沉积产量的估计。估计的年度沉积收益数据然后与沉积交货比率和土壤损失忍耐的概念被相结合在分水岭规模估计土壤/地点稳定性。分析从分布式的分水岭进程用沉积收益估计建议那,时间空间平均土壤损失忍耐值是不一致的。因此,新分布式的土壤/地点稳定性标准被需要在估计牧场分水岭的健康代替土壤损失忍耐概念。沉积搬运/产出模型在一个分水岭在内部点被使用模仿分布式的沉积过程。然而,这些模型的申请要求刻度和确认数据并且因此依赖于沉积集中和收益数据库的可获得性。因此,另外的努力被要求与继续的测量一起通过历史的数据的营救造沉积收益数据库并且在存在和新采样地点监视。
简介:Forwaterandsoilconservationandwaterpollutioncontrol,itisveryimportanttosimulateandpredicttheloadofsedimentandpollutantduringstorm-runoff.Onthebasisofanalyzingthesimultaneousmeasurementsofflow,sedimentandpollutantsobservedatwatershedoutlet,apracticalsedimentyieldmodelisdevelopedbystandardizingtheloadrate.Theresultsshowthatthestandardizedpollutantyieldequalseffectiverainfallandtheprocessofeffectiveloadyieldisthesameaseffectiverainfallhyetograph.Comparisonwithmeasureddatashowthatthismodelisapplicabletovariouspollutants.
简介:Inthispaper,thedevelopmentofthestudiesontheweather-yieldsimulationandforecastingmodelinChinaisbrieflyreviewed,andthemainfeaturesofthecurrentdevelopmentstagearepresented.Moreover,throughexamplesthetechnicalcharacters,approachesandexperimentalresultsaredetailedlydescribedanddiscussedofseveralmajorstatisticalforecastingmodels,dynamiccropgrowthsimulationandthesatelliteremotesensingmethodstoestimatecropyield.Finally,thelineoffurtherdevelopmentandtheappliedfieldarepointedout.Atthepresenttime,inparticular,usingtheabove-mentionedmodellingtechniquestosimu-lateandevaluatethepossibleimpactofclimaticvariationonagriculturalproductionandfurtheronman’ssurvivalandactivitiesareofaverypracticalsignificanceaswellassocioeconomicbenefits.
简介:Weathermodelsareessentialtoolsforcheckingoftheeffectoftheweatherelementsintermsoftheireffectontheproductionofthecrop.Thisresearchisanattempttoseetheeffectofonlytwovariablesi.e.,temperatureandrainfallforthedivisionFaisalabad(semitropicalregionofPakistan).Themodelfittedisofthelinearform:thevaluesofa,b,chavebeenfound.Theexpectedyieldhasbeencalculatedbyusingthearidityindices(X1andX2)andtheresultintheformofcoefficientofdeterminationR2hasbeenfoundequalto0.166.Thesignificanceoftheregressioncoefficienthasbeentested,whichshowsthatthecontributiontotheyieldfromaridityindexatgerminationandthatatripeningissignificant.Thewheatyieldsaretheresultsofawidevarietyofvariables,mostofwhichshowvaryingdegreeofrelationshipwithoneanother,somepositiveandsomenegativeintermsofoutput.Thesevariablesmaybetechnology,fertilizers,pesticides,epidemics,kindsofseedsused,market
简介:Inordertoestimatetheerosionratesofsomeplasmafacingcomponentmaterials,thesputteringyieldsofMo,WandLibombardedbychargedparticlesH^+,D^+,T^+andHe^+arecalculatedbyapplicationofsputteringtheorybasedonbipartitionmodelofiontransport.ThecomparisonswithMonte-Carlocalculationresultsaremade.Thesedatamightbeusefultoestimatethelifetimeofplasmafacingcomponentsandtoanalyzetheimpuritylevelincoreplasmaoffusionreactors.
简介:Theeffectsofnitrogen,phosphorusandpotassiumapplicationlevel,seedrateandtransplantingdensityonthegrowthanddevelopmentofriceplantswerestudiedtofindoutnutrientstatusinhigh-yieldingriceplantsandtoincreasegrainyieldbyadequatefertilization.Therewasanequilibriumrelationshipamongnutrientelementsforhigh-yieldingriceplantpopulations.Theequilibriumindexofnutrientamount,contentanddistributioninhigh-yieldingriceplantsshouldbegenerallygreaterthan-2butlessthan2.Theoptimumnutritiveproportionofnitrogen:phosphorus:potassiumassimilatedbytheplantswasabout10:2:9attheripeningstage.Butthecontentandtheproportionvariedwiththegrowthstages,Therefore,thenutrientinriceplantpopulationsshouldbeinadynamicequilibrium.Soastoachievehighyield.
简介:理解在地志的索引和庄稼收益可变性之间的关系在卷风景为土壤管理和庄稼生产是重要的。在Alvena和赫本,的二块农业地萨克其万,加拿大被选择检验索引怎么地志与小麦产量在下面有关二地志并且在加拿大人的天气条件大草原。二个地点的风景作为圆丘般被分类,主导的土壤类型是AridicUstoll。在产量,地形学,土壤,和天气之中的关系用小麦(TriticumaestivumL.)被分析从在2001的Alvena(干燥的年)的谷物产量并且2004(湿年)并且从在1998的赫本(干燥的年)。Topographic/soil索引包括了相对举起,湿索引在斜坡长度上面,弯曲,土壤有机物,和在播种前的土壤潮湿存储。结果显示了那,在干燥的年里,关联系数在之间在斜坡上面,长度和谷物产量在1998为浅轻轻的滚动风景(赫本)在2001和0.73为典型滚动风景(Alvena)是0.79。在湿年(2004)里,在产量和topographic/soil属性之间的关系不象在干燥的年里一样强壮。因此,在斜坡上面,长度是为干燥的年里的二处风景的最好的收益指示物,而没有地志的索引高度被相关在湿年里收割产量。那些地志的索引在识别收益可变性并且描出似乎有用合适的管理地区。
简介:丙烯倡导者LCC测试的评估--A在凳子规模被执行固定的使流体化的床反应堆和一个飞行员规模起床人。这个倡导者的在工业上的应用实验在Dalian石油化学的Co.and#1在#3RFCCU被进行在上海石油化学的公司的综合精制单位。测试结果在增加倡导者LCC的5%-6%以后显示出那--A到丙烯收益和选择是的主要FCC催化剂FCC汽油评价的raisedobviously.The辛烷由超过一个单位被增加;它能减轻辛烷的否定影响数字衰落源于石蜡内容的减小当时,与到迫切市场需求forpropylene.The测试结果在上海石油化学的同伴完成了的会的增加的丙烯收益一起的inFCC石油揭示了那LCC的增加--一个倡导者到达了5%催化剂库存,它的表演能等同于海外倡导者OlefinsMax的
简介:在在中国广泛地使用的父母行的各种各样的组之中比较杂种优势层次,在父母水池识别foundationalheterotic组并且理解在基因距离和杂种优势性能之间的关系,有广泛的基因变化的16父母行从各种各样的亚群被选择,,并且在中国的福建和海南省。主要结果如下:(1)16父母行能被组织进由1维护者亚群组成的7亚群和6restorer亚群;(2)restorer行的吝啬的谷物产量比维护者行的高,并且意味着父母行的产量比混合联合的高;(3)二个最好的heterotic模式是II-32A?瑣渠'?畭'站淬超嵃]瑩?湡?慦楴畧?桷汩?整瑸湩?湯愠琠畯档'涨脺*e慭瑲桰湯e
简介:南部的山麓陆地受苦当时,节制到严重侵蚀在单身者下面的farmed?庄稼,到由犁板耕作,disking或耙地组成的系统为止常规。这主要由于高土壤侵蚀度,高精力春天?夏天暴风雨,低残余盖子,和差的管理因素。没有庄稼的一个冬季季节经常从降雨影响让土壤没有防卫。最小化耕种并且在夏天和冬季两个都把成长庄稼和庄稼残余留在表面的保存收割系统保护土壤免受腐蚀效果的伤害并且支撑生产率。在这篇论文我们在场并且讨论土壤损失,流量和残余生产数据从26年一2.71哈典型地代表小南部的山麓分水岭的集水。集水首先从1972~1974在夏天大豆(Glycine最大(L.)Merrill)和冬季休闲的常规耕种系统被管理。它然后被变换成收割夏天大豆的系统的保存,蜀黍(蜀黍二色(L.)Moench),或棉花(Gossypiumhirsutum(L.))和冬季大麦(Hordeumvulgare(L.)),小麦(Triticumaestivum(L.)),或继续了到礼品的苜蓿(Trifoliumincarnatum(L.))。立即的有的保存收割系统和在在夏天和冬季控制侵蚀和流量的剩余效果。破坏土壤侵蚀,从高精力,暴风雨显著地被减少。在保存收割下面在常规耕种下面从大约2Mgha-1yr-1增加到9.88Mgha-1yr-1的残余生产在20年的系统。
简介:InordertoprovideascientificbasisforriceyieldestimationandimprovetheacouracyofyieldestimationinZhejiangProvince,Regionalizationindicesforriceyieldestimationbyremoesensing(RS)intheprovinceweredeterminedbyconsjderingthespecialfeaturesofyieldestimationbyRS,andbasedonanalysisofthenaturalconditionsofZhejiangProvince,Theindicesdeterminedincludedricecroppingsystem,agroclimate,landform,surfacefeaturesturctureandriceyieldlevel,wherericeplantingsystemwasconsideredasthemianone,ThenreionalizationfroriceyieldestimationbyRSwascompletedbyspatialneighboringanalysiswiththeGeographicalInfromationSystem(GIS)technologycombinedwithusigoftreealgorithmTheprovincewasdividedintotworegions,i.e.,thesingle-croppingriceregionwhichwassubdividedinto3regionsincludingthoseinmountainsofnorthewstZhejiang,waternetworkareaofnorthZhejiangandmountainsofsothZhejiang,anddouble-croppingriceregionwhichwassudividedinto5regionsincludingthoseonplainofnorthZhejiang,coastalplainsandhillsofsoutheastZhejiang,Jin-QuBasinofmiddleZhejiang,hillsofeastZhejiang,andhillsandmountainsofnorthewatZhejiang,thisregionaliztiontookthecountybordersastheregionboundaries,kepttheregionsconnectiveandmadetheadministrativregionsintegrityand,then,couldmeettherequirementsofriceyieldestimationbyRS,showingthattheresultswerequitesatisfying.
简介:微地形学;小地貌是影响分开,运输,和流量的侵蚀过程的高地区域的一个重要表面特征。然而,很少量的信息都不关于在微地形学和沉积产出的表面之间的关系是可得到的。实验室降雨模拟研究被进行为四不同侵蚀决定易受影响的土壤在微地形学和沉积各在0.75h持续时间和60公里h^-1紧张的一系列6~8暴风雨期间产出的表面的变化。选择的土壤是Grenada的Ap材料sil(GlossicFragiudalfs),Atwoodsil(TypicPaleudalfs),和Forestdalesicl(TypicOchraqualfs),以及C材料,Glauconitic沉积,Rustonsil(TypicPaleudalfs)。土壤床与一个像苗床的表面条件在斜槽被准备。在所有前并且在每暴风雨以后,表面微地形学用激光microreliefmeter被决定。微地形学;小地貌,以吝啬的本地地志的坡度,和流量数据表示了在四土壤之中显示一个很类似的模式。沉积集中的开始快速的增加,它快速到达了最大值然后逐渐地减少了到一个近的常数在暴风雨系列的结束珍视的数据表演。沉积产量仔细由于近经常的流量率跟随了沉积集中趋势。微地形学在第一暴风雨期间,但是然后很快改变了的表面减少了对为大多数在顺序的以后的暴风雨的近似经常的价值更渐渐。在沉积yield-microtopography关系中的三个不同阶段被认出:(1)preponding分阶段执行,(2)增加池溏的沉积产量分阶段执行的一根柱子,并且(3)一根柱子减少池溏的沉积收益阶段。这些阶段在粗糙驱散,小河发展,和土壤表面的土壤侵蚀过程的相对重要性反映变化矩阵稳定。
简介:Overaperiodoftwoyears,fieldexperimentswereconductedontwosiltyloamsoilsgrownwithfoursolanaceousvegetablecropsofeggplant(var.serpentinumBailey),tomato(var.communeBailey),sweetpepper(var.grossumBailey)andchilli(var.lengumBailey),respectively.Eachexperimentincludedfourtreatmentswithfromlowtohighdoses,0~450kgha-1foreggplant,tomatoandsweetpepper,and0~270kgha-1forchilli,ofKfertilizersintheformofsulfateofpotash(SOP)appliedtogetherwithNandPfertilizers.OneCKtreatmentwithoutK,NandPfertilizersappliedandonetreatmentofKfertilizerintheformofmuriateofpotash(MOP)appliedatthehighlevel(450kgha-i)togetherwithNandPfertilizerswereincludedintheexperimentsofeggplant,inordertocomparetheeffectsofSOPandMOP.ThefruityieldsofthetestedcropsincreasedsignificantlywiththeincreasingrateofKapplication.ThecropssuppliedwithKfertilizersyieldedmorestablyastheCV%oftheiryieldsdecreasedwiththerateofKapplication.ThedrymatterandvitaminCcontentsinfruitsoftomato,sweetpepperandchilli,andthesugarcontentandthetitratableacidityleveloftomatofruitswereincreased,andtheS/Aratio(ratioofsugarcontenttotitratableacidity)oftomatofruitsweredecreasedbyKfertilization,indicatingthatKfertilizationcouldimprovethefruitqualityofthesolanaceousvegetablecrops.However,thehighrateofKfertilizermightlowerthedrymatterandvitaminCcontentsoftomatofruitsandsweetpepperfruits.SOPwasmoreeffectivethanMOPinincreasingtheyieldandqualityofeggplantfruitsatthehighfertilizationrate;therefore,thechoiceofapplyingSOPmaybebetterforhighlevelsofKfertilization.