Areasff
ff.163.com 时间:2021-03-03 阅读:()
EffectionofRainfallinsummeronthelandscapewateringreenareaofBeijingHaiqiWei1,a,FanFu*2,bXinyeWu3,c,TianxiongYin4,d,ZichaoFan5,e1,2,3,4,5NorthChinaUniversityofTechnology,JinYuanZhuangRoadNo.
5,ShijingshanDistrict,Beijing,Chinaa921661243@qq.
com,bmattbff@163.
com,c851160780@qq.
com,dytx0710@qq.
com,e17729895232@qq.
comKeywords:Stormwaterrunoff;Landscapewater;FluctuationofwaterqualityAbstract.
Asanimportantpartofurbangreenarea,especiallytheparksinthecity,thefluctuationofthewaterqualityofwaterlandscapehasbecomethefocusofurbanecologicalenvironment.
Duetotherapiddevelopmentofurbanization,urbanhardenedarea(suchasroofing,pavingroads,etc.
)continuestoincrease,causingtheaccumulationofpollutants.
Therefore,urbanstormwaterrunoffwhichcarrieslargeamountsofpollutantshasagreatimpactonlandscapewaterintheurbangreenspace.
Consideringthis,athree-monthwaterqualitymonitoringwascarriedoutinthispaperusingHachwaterqualitytestertotestthreetypicalbodiesofwaterwhichhavedifferentoriginsandsourceofpollutionduringtherainyseasonofBeijing.
Theresultsshowedthaturbanstormwaterrunoffmayhaveseriousimpactonthequalityoflandscapewater.
IntroductionWaterlandscapeisanimportantpartofurbangreenarea,especiallytheparksinthecity.
Ithasmanyfunctionswhichcanbenefitthelandscapestructure,irrigationandwatersupply,waterdetentionandfloodcontrolaswellasbiodiversity.
Stormwaterrunoffhasbecomeoneofthemainsourceofpollutionofurbanwaterenvironment.
Owingtotherapidurbanization,impermeablelandsurfacesuchasbusinesscenter,residentialarea,roadsandparkinglotshaveincreasedleadingtothedecreaseofstormwaterpermeatingintotheunderground.
Therefore,surfacerunoffbecomesincreasinglymuch.
Undertheinfluenceoftheofsurfacerunoff'sscour,muchpollutionthatexistsonthegroundgoesintothewaterbodyandthenchangethephysical,chemicalandbiologicalpropertiesofthewater,becomingthemainelementwhichinfluencesthewaterquality[1].
ThemajorindexesofthemonitoringareCOD,BOD,Totalnitrogen(TN),totalphosphorus(TP)andammonianitrogen(NH3-N.
)andTSS[2].
ThroughthemonitoringofpollutantconcentrationoflandscapewaterbothinsunnyweatherandrainydaysandthencomparingtheresultswiththeClassIVwaterstandardinEnvironmentalQualityStandardsforSurfaceWater[3],Thechangeofwaterqualityandpollutioncausedbystormwaterwasanalyzedandthesuggestionswereputforward.
MethodologyResearchAreas.
TostudytheinfluenceofstormwaterinsummertothelandscapewaterofgreenareainBeijing,YuyuantanPark,OlympicForestParkandTheSummerPalacewerechosenasthethreeresearchareas.
Yuyuantanoccupiesatotalareaof136.
69hectaresandboasts74hectaresofwaterareawhichoriginatesfromJingmianddiversioncanalofYongding.
ItsGreencoverageratereachesover95%andboastsabout199,500typesofplants[4].
BeijingOlympicForestParkisnexttothetheOlympicstadiumareainthesouth,closetothesuburbangreenbeltinthenorthandstretchesacrossthecity'smainloop(theNorthFifthRing).
BeijingOlympicForestParkoccupiesatotalareaof68,000hectares(12,200hectaresofwaterarea,thevastmajorityofthewaterisstillwater)anditsplantcoveragereaches90%[5].
SummerPalacecoversanareaof290hectares.
ThesurfaceareaofKunminglakeintheSummerPalaceaccountsforabout78%oftheentirepark.
ThewaterinSummerPalaceoriginatesfromYuquanHill,ChangpingdiversionandJingmidiversion.
MonitoringMethod.
HachwaterqualitytestingmeterisusedtomonitortheindexessuchasCOD,BOD,Totalnitrogen,totalphosphorusandammonianitrogenandTSS,etc.
Themonitoringspotsaresetupbasedonthecharacteristicsoftheresearchareas.
AccordingtotheWaterandExhaustedWaterMonitoringAnalysisMethod,everyspotissetupintheplaceblowthewatersurfaceMonitoringResultsandAnalysisCODMonitoringResultAnalysis.
"EnvironmentQualityStandardsforSurfaceWater"(G3838-2002)inChinaprovidesthattheallowablevalueofCODinTable2.
Table1:StandardofCODClassIClassIIClassIIIClassIVClassVCOD≤1515203040AsshowninFigure1,themainlakeintheOlympicForestPark,thesummerpalaceKunmingLake,YuyuantanEastLakewaterqualitygenerallyofrainfallweatherworsethansunnyweather.
Thecurvefluctuationofthethreeresearchareasismoreuniform.
CODconcentrationinJuly19thwasbetterthanJuly6th.
BecauseoftherainstorminJuly19th,alargeamountofwater,thewaterflowspeed,enhanceself-purificationcapacityofCOD.
Duringtheperiod,alargeamountofwater,thewaterflowhighspeed,enhanceself-purificationcapacityofCOD.
Nomatterrainornon-rainfallweatherconditions,KunmingLakereachedclassIVstandard.
OlympicForestParklakeonlyinMay12thCODintheVclass.
OthermonitoringdatesareinlinewiththeIVclass.
YuyuantanEastLakeinJuly6thsunnyweatherconditions,CODexceededtheclassIVwaterstandard,whichbelongstotheclassVwater.
TheresultsofthethreestudyareasCODconcentrationshowthatYuyuantanEastLake>OlympicForestParkLake>KunmingLake.
Therefore,theKunminglakewaterqualityisbest,YuyuantanEastLakeisrelativelypoor.
Fig1:CODinlandscapewaterFig2:TPinlandscapewaterTPMonitoringResultAnalysis.
"EnvironmentQualityStandardsforSurfaceWater"(G3838-2002)inChinaprovidesthattheallowablevalueofTPinTable3.
Table2:StandardofTPClassIClassIIClassIIIClassIVClassVTP≤0.
020.
10.
20.
30.
4AsshowninFigure2,comprehensivestudyoftheTPdatainallareas,only25%ofthedataincompliancewiththeIVclass,33%belongtotheVclass,42%belongtotheinferiorVclass.
Onsunnydays,theTPwerealsoinexcessoftheIVclassstandards.
ThattotalphosphorusinwaterofBeijingparksseriouslyexceedthestandard.
TheOlympicForestParkandYuyuantaneastlakefluctuationcurveofregularityissimilar.
TheoveralltrendoftheTPintherainwaterwasincreased.
ThefluctuationofKunminglakehasacompletelyoppositetrendwiththeothertworesearchareas.
ThetrendofTPinKunminglakeisdecreasedinthepresenceofrainfall.
TheTPinKunminglakewasgenerallyveryhighofsunnydays,allofwhichbelongedtoVclassandinferiorVclassstandard.
TNMonitoringResultAnalysis.
"EnvironmentQualityStandardsforSurfaceWater"(G3838-2002)inChinaprovidesthattheallowablevalueofTNinTable4.
Table3:StandardofTNClassIClassIIClassIIIClassIVClassVTN≤0.
20.
51.
01.
52.
0AsshowninFigure3,thereissimilartothatofKunminglakeandtheOlympicForestParkLakeintherainfallandsunnyweatherconditionsoftotalnitrogenconcentrationfluctuationcurve.
TheTNconcentrationofrainfallishigherthanthatofsunnyweather.
AndintheMay,June,JulyTNinthewaterthereisagradualdownwardtrend.
Themainreasonisthattheplantisflourishinginsummer,whichcaneffectivelypurifythewaterquality.
KunminglakeandtheOlympicForestParkcurveissimilartothelawoffluctuation.
ButtheTNinthemainlakeofOlympichigherthanthatofKunmingLake.
TheTNinKunminglakeisconsistentwiththeIVstandard.
TheTNoftheOlympicForestParkinJuneandJulywasinaccordancewiththeIIIstandard.
Vclassstandardsforrainfallconditions.
InMay,thatwasbadderthanVcriterion.
Yuyuantanisdifferentfromtheothertwostudyareafluctuation.
ShowsthatthefirsttimerainwaterTN>sunnyweatherwaterTN>secondrainwaterTN.
Fig3:TNinlandscapewaterFig4:NH3-NinlandscapewaterNH3-NMonitoringResultAnalysis.
"EnvironmentQualityStandardsforSurfaceWater"(G3838-2002)inChinaprovidesthattheallowablevalueofNH3-NinTable5.
Table4:StandardsofNH3-NClassIClassIIClassIIIClassIVClassVNH3-N≤0.
150.
51.
01.
52.
0AsshowninFigure4,threeresearchsitesshowedsignificantlyhigherconcentrationofNH3-Ninwaterundertheconditionofrainfallweathertrend.
Butfromthecurvetrend,changesofmainlakeofOlympicForestParkandEastLakeofYuyuantanaremoresimilar.
Toanalyzethewaterqualityofthethreeresearchareas.
WhetheritisrainorsunnyweatherconditionstheconcentrationofNH3-NcanreachIIstandards.
ItshowsthatthewaterofparkgreenspaceinBeijingisverygoodforthecontrolofthepollutantindexofNH3-N.
Fig5:TSSinlandscapewaterTSSMonitoringResultAnalysis.
AsshowninFigure5,threestudyareainsunnyweatherwithrainsvariationofTSSconcentrationtherewasasimilarity,substantiallyhigherthantheTSSrainssunnyweather.
TSSrainfallishigherthanthefineweather.
IstheYuyuantancruiseactivitiesfrequentlymainlyduetothepeakinJune3rdinthesunnyweathersituation.
HumanactivityhasacertaineffectontheconcentrationofTSSinwater.
ConclusionsAccordingtothewaterqualitymonitoringofthreelandscapewaterforaperiodofthreemonthsinBeijing.
Itcanbeobservedthatthepollutioncausedbytherainwaterrunofffromtheurbanrainwatercancauseaseriousimpactonthelandscapewaterbody.
Therearesomemainreasonsforthedifferenceinthedegreeofwaterpollutionfromthestormwaterrunoff.
First,thewaterresourcesofthethreestudyareasaredifferent,andthereareobviousdifferencesinthevariousindicators.
Second,thedegreeofnaturalrevetmentiscausedbythedifferentinfluencedegreeofrunoffareimportantreasonforthedifference.
Comparedwithartificialhardeningrevetmentthenaturalrevetmentcanreducerunoffvelocityandtoreducethepollutantintheprocessoftransmission.
Third,differencesintheamountofwaterinthewaterisalsooneofthefactors.
Root,stemandleafofplantcanplayacertainroleinterceptionofrainwaterrunoff.
Throughcomparativeanalysis.
Tobettercontrolandoptimizethelandscapewaterqualityandreducetheimpactonwaterqualityofrainwaterrunoff.
Firstly,itshouldbedoneonwatersourcesqualitycontrol.
Proposedthecorrespondingsolutionstrategiesforpollutantindextohighlightgovernance.
Ifnecessaryitwillcreateartificialrainwetlands,grassedswales,sunkengreenspace,raingardensandothergreeninfrastructuretopurifywater.
Andpayattentiontotheamountofwateronplantcultivationandconservation.
Reasonablerevetmentandplantingwithaquaticplantscaneffectivelyalleviatethepollutionofstormwaterrunoff.
Whiletheplanninganddesignstageforlargelandscapewatersshouldavoidexcessivehardrevetment,reducingthepossibilityofstormwaterrunoffdirectlyintothewaterbodylandscape.
AcknowledgmentsThisworkwasfinanciallysupportedbyScientificResearchTrainingprogramforCollegeStudents---StudyoncomprehensiveecologicalbenefitsofConstructedWetland.
Itemstatuscoding:(XN001-105).
References[1]LILi-qing,YINCheng-qing,KONGLing-li,HEQing-ci:EffectofAntecedentDryWeatherPeriodonUrbanStormRunoffPollutionLoad,edtiedbyenviromentalscience,2287-2293(2007).
[2]CHENSi-jia,SUDe-rong,ComparisonandmonitoringofwaterqualityindifferentwaterareaofurbangreenspaceinBeijing,edtiedbyJournalofCentralSouthUniversityofForestry&Technology,122-149(2013).
[3]ThePeople'sRepublicofChinaStandard.
GB3838-2002.
[4]XiaoXiong-fang,TheComparativeStudyofRecreationalCharacteristiconTheGreenwayandCityParkUsers,(2014).
[5]HUJie,WUYi-xia,LVLu-shan,WaterSystemPlanofBeijingOlympicForestPark,edtiedbyChinesegarden,14-19(2006).
5,ShijingshanDistrict,Beijing,Chinaa921661243@qq.
com,bmattbff@163.
com,c851160780@qq.
com,dytx0710@qq.
com,e17729895232@qq.
comKeywords:Stormwaterrunoff;Landscapewater;FluctuationofwaterqualityAbstract.
Asanimportantpartofurbangreenarea,especiallytheparksinthecity,thefluctuationofthewaterqualityofwaterlandscapehasbecomethefocusofurbanecologicalenvironment.
Duetotherapiddevelopmentofurbanization,urbanhardenedarea(suchasroofing,pavingroads,etc.
)continuestoincrease,causingtheaccumulationofpollutants.
Therefore,urbanstormwaterrunoffwhichcarrieslargeamountsofpollutantshasagreatimpactonlandscapewaterintheurbangreenspace.
Consideringthis,athree-monthwaterqualitymonitoringwascarriedoutinthispaperusingHachwaterqualitytestertotestthreetypicalbodiesofwaterwhichhavedifferentoriginsandsourceofpollutionduringtherainyseasonofBeijing.
Theresultsshowedthaturbanstormwaterrunoffmayhaveseriousimpactonthequalityoflandscapewater.
IntroductionWaterlandscapeisanimportantpartofurbangreenarea,especiallytheparksinthecity.
Ithasmanyfunctionswhichcanbenefitthelandscapestructure,irrigationandwatersupply,waterdetentionandfloodcontrolaswellasbiodiversity.
Stormwaterrunoffhasbecomeoneofthemainsourceofpollutionofurbanwaterenvironment.
Owingtotherapidurbanization,impermeablelandsurfacesuchasbusinesscenter,residentialarea,roadsandparkinglotshaveincreasedleadingtothedecreaseofstormwaterpermeatingintotheunderground.
Therefore,surfacerunoffbecomesincreasinglymuch.
Undertheinfluenceoftheofsurfacerunoff'sscour,muchpollutionthatexistsonthegroundgoesintothewaterbodyandthenchangethephysical,chemicalandbiologicalpropertiesofthewater,becomingthemainelementwhichinfluencesthewaterquality[1].
ThemajorindexesofthemonitoringareCOD,BOD,Totalnitrogen(TN),totalphosphorus(TP)andammonianitrogen(NH3-N.
)andTSS[2].
ThroughthemonitoringofpollutantconcentrationoflandscapewaterbothinsunnyweatherandrainydaysandthencomparingtheresultswiththeClassIVwaterstandardinEnvironmentalQualityStandardsforSurfaceWater[3],Thechangeofwaterqualityandpollutioncausedbystormwaterwasanalyzedandthesuggestionswereputforward.
MethodologyResearchAreas.
TostudytheinfluenceofstormwaterinsummertothelandscapewaterofgreenareainBeijing,YuyuantanPark,OlympicForestParkandTheSummerPalacewerechosenasthethreeresearchareas.
Yuyuantanoccupiesatotalareaof136.
69hectaresandboasts74hectaresofwaterareawhichoriginatesfromJingmianddiversioncanalofYongding.
ItsGreencoverageratereachesover95%andboastsabout199,500typesofplants[4].
BeijingOlympicForestParkisnexttothetheOlympicstadiumareainthesouth,closetothesuburbangreenbeltinthenorthandstretchesacrossthecity'smainloop(theNorthFifthRing).
BeijingOlympicForestParkoccupiesatotalareaof68,000hectares(12,200hectaresofwaterarea,thevastmajorityofthewaterisstillwater)anditsplantcoveragereaches90%[5].
SummerPalacecoversanareaof290hectares.
ThesurfaceareaofKunminglakeintheSummerPalaceaccountsforabout78%oftheentirepark.
ThewaterinSummerPalaceoriginatesfromYuquanHill,ChangpingdiversionandJingmidiversion.
MonitoringMethod.
HachwaterqualitytestingmeterisusedtomonitortheindexessuchasCOD,BOD,Totalnitrogen,totalphosphorusandammonianitrogenandTSS,etc.
Themonitoringspotsaresetupbasedonthecharacteristicsoftheresearchareas.
AccordingtotheWaterandExhaustedWaterMonitoringAnalysisMethod,everyspotissetupintheplaceblowthewatersurfaceMonitoringResultsandAnalysisCODMonitoringResultAnalysis.
"EnvironmentQualityStandardsforSurfaceWater"(G3838-2002)inChinaprovidesthattheallowablevalueofCODinTable2.
Table1:StandardofCODClassIClassIIClassIIIClassIVClassVCOD≤1515203040AsshowninFigure1,themainlakeintheOlympicForestPark,thesummerpalaceKunmingLake,YuyuantanEastLakewaterqualitygenerallyofrainfallweatherworsethansunnyweather.
Thecurvefluctuationofthethreeresearchareasismoreuniform.
CODconcentrationinJuly19thwasbetterthanJuly6th.
BecauseoftherainstorminJuly19th,alargeamountofwater,thewaterflowspeed,enhanceself-purificationcapacityofCOD.
Duringtheperiod,alargeamountofwater,thewaterflowhighspeed,enhanceself-purificationcapacityofCOD.
Nomatterrainornon-rainfallweatherconditions,KunmingLakereachedclassIVstandard.
OlympicForestParklakeonlyinMay12thCODintheVclass.
OthermonitoringdatesareinlinewiththeIVclass.
YuyuantanEastLakeinJuly6thsunnyweatherconditions,CODexceededtheclassIVwaterstandard,whichbelongstotheclassVwater.
TheresultsofthethreestudyareasCODconcentrationshowthatYuyuantanEastLake>OlympicForestParkLake>KunmingLake.
Therefore,theKunminglakewaterqualityisbest,YuyuantanEastLakeisrelativelypoor.
Fig1:CODinlandscapewaterFig2:TPinlandscapewaterTPMonitoringResultAnalysis.
"EnvironmentQualityStandardsforSurfaceWater"(G3838-2002)inChinaprovidesthattheallowablevalueofTPinTable3.
Table2:StandardofTPClassIClassIIClassIIIClassIVClassVTP≤0.
020.
10.
20.
30.
4AsshowninFigure2,comprehensivestudyoftheTPdatainallareas,only25%ofthedataincompliancewiththeIVclass,33%belongtotheVclass,42%belongtotheinferiorVclass.
Onsunnydays,theTPwerealsoinexcessoftheIVclassstandards.
ThattotalphosphorusinwaterofBeijingparksseriouslyexceedthestandard.
TheOlympicForestParkandYuyuantaneastlakefluctuationcurveofregularityissimilar.
TheoveralltrendoftheTPintherainwaterwasincreased.
ThefluctuationofKunminglakehasacompletelyoppositetrendwiththeothertworesearchareas.
ThetrendofTPinKunminglakeisdecreasedinthepresenceofrainfall.
TheTPinKunminglakewasgenerallyveryhighofsunnydays,allofwhichbelongedtoVclassandinferiorVclassstandard.
TNMonitoringResultAnalysis.
"EnvironmentQualityStandardsforSurfaceWater"(G3838-2002)inChinaprovidesthattheallowablevalueofTNinTable4.
Table3:StandardofTNClassIClassIIClassIIIClassIVClassVTN≤0.
20.
51.
01.
52.
0AsshowninFigure3,thereissimilartothatofKunminglakeandtheOlympicForestParkLakeintherainfallandsunnyweatherconditionsoftotalnitrogenconcentrationfluctuationcurve.
TheTNconcentrationofrainfallishigherthanthatofsunnyweather.
AndintheMay,June,JulyTNinthewaterthereisagradualdownwardtrend.
Themainreasonisthattheplantisflourishinginsummer,whichcaneffectivelypurifythewaterquality.
KunminglakeandtheOlympicForestParkcurveissimilartothelawoffluctuation.
ButtheTNinthemainlakeofOlympichigherthanthatofKunmingLake.
TheTNinKunminglakeisconsistentwiththeIVstandard.
TheTNoftheOlympicForestParkinJuneandJulywasinaccordancewiththeIIIstandard.
Vclassstandardsforrainfallconditions.
InMay,thatwasbadderthanVcriterion.
Yuyuantanisdifferentfromtheothertwostudyareafluctuation.
ShowsthatthefirsttimerainwaterTN>sunnyweatherwaterTN>secondrainwaterTN.
Fig3:TNinlandscapewaterFig4:NH3-NinlandscapewaterNH3-NMonitoringResultAnalysis.
"EnvironmentQualityStandardsforSurfaceWater"(G3838-2002)inChinaprovidesthattheallowablevalueofNH3-NinTable5.
Table4:StandardsofNH3-NClassIClassIIClassIIIClassIVClassVNH3-N≤0.
150.
51.
01.
52.
0AsshowninFigure4,threeresearchsitesshowedsignificantlyhigherconcentrationofNH3-Ninwaterundertheconditionofrainfallweathertrend.
Butfromthecurvetrend,changesofmainlakeofOlympicForestParkandEastLakeofYuyuantanaremoresimilar.
Toanalyzethewaterqualityofthethreeresearchareas.
WhetheritisrainorsunnyweatherconditionstheconcentrationofNH3-NcanreachIIstandards.
ItshowsthatthewaterofparkgreenspaceinBeijingisverygoodforthecontrolofthepollutantindexofNH3-N.
Fig5:TSSinlandscapewaterTSSMonitoringResultAnalysis.
AsshowninFigure5,threestudyareainsunnyweatherwithrainsvariationofTSSconcentrationtherewasasimilarity,substantiallyhigherthantheTSSrainssunnyweather.
TSSrainfallishigherthanthefineweather.
IstheYuyuantancruiseactivitiesfrequentlymainlyduetothepeakinJune3rdinthesunnyweathersituation.
HumanactivityhasacertaineffectontheconcentrationofTSSinwater.
ConclusionsAccordingtothewaterqualitymonitoringofthreelandscapewaterforaperiodofthreemonthsinBeijing.
Itcanbeobservedthatthepollutioncausedbytherainwaterrunofffromtheurbanrainwatercancauseaseriousimpactonthelandscapewaterbody.
Therearesomemainreasonsforthedifferenceinthedegreeofwaterpollutionfromthestormwaterrunoff.
First,thewaterresourcesofthethreestudyareasaredifferent,andthereareobviousdifferencesinthevariousindicators.
Second,thedegreeofnaturalrevetmentiscausedbythedifferentinfluencedegreeofrunoffareimportantreasonforthedifference.
Comparedwithartificialhardeningrevetmentthenaturalrevetmentcanreducerunoffvelocityandtoreducethepollutantintheprocessoftransmission.
Third,differencesintheamountofwaterinthewaterisalsooneofthefactors.
Root,stemandleafofplantcanplayacertainroleinterceptionofrainwaterrunoff.
Throughcomparativeanalysis.
Tobettercontrolandoptimizethelandscapewaterqualityandreducetheimpactonwaterqualityofrainwaterrunoff.
Firstly,itshouldbedoneonwatersourcesqualitycontrol.
Proposedthecorrespondingsolutionstrategiesforpollutantindextohighlightgovernance.
Ifnecessaryitwillcreateartificialrainwetlands,grassedswales,sunkengreenspace,raingardensandothergreeninfrastructuretopurifywater.
Andpayattentiontotheamountofwateronplantcultivationandconservation.
Reasonablerevetmentandplantingwithaquaticplantscaneffectivelyalleviatethepollutionofstormwaterrunoff.
Whiletheplanninganddesignstageforlargelandscapewatersshouldavoidexcessivehardrevetment,reducingthepossibilityofstormwaterrunoffdirectlyintothewaterbodylandscape.
AcknowledgmentsThisworkwasfinanciallysupportedbyScientificResearchTrainingprogramforCollegeStudents---StudyoncomprehensiveecologicalbenefitsofConstructedWetland.
Itemstatuscoding:(XN001-105).
References[1]LILi-qing,YINCheng-qing,KONGLing-li,HEQing-ci:EffectofAntecedentDryWeatherPeriodonUrbanStormRunoffPollutionLoad,edtiedbyenviromentalscience,2287-2293(2007).
[2]CHENSi-jia,SUDe-rong,ComparisonandmonitoringofwaterqualityindifferentwaterareaofurbangreenspaceinBeijing,edtiedbyJournalofCentralSouthUniversityofForestry&Technology,122-149(2013).
[3]ThePeople'sRepublicofChinaStandard.
GB3838-2002.
[4]XiaoXiong-fang,TheComparativeStudyofRecreationalCharacteristiconTheGreenwayandCityParkUsers,(2014).
[5]HUJie,WUYi-xia,LVLu-shan,WaterSystemPlanofBeijingOlympicForestPark,edtiedbyChinesegarden,14-19(2006).
Hostodo独立日提供四款特价年付VPS套餐 最低年付$13.99
前天，还有在"Hostodo商家提供两款大流量美国VPS主机 可选拉斯维加斯和迈阿密"文章中提到有提供两款流量较大的套餐，这里今天看到有发布四款庆祝独立日的七月份的活动，最低年付VPS主机13.99美元，如果有需要年付便宜VPS主机的可以选择商家。目前，Hostodo机房可选拉斯维加斯和迈阿密两个数据中心，且都是基于KVM虚拟+NVMe整列，年付送DirectAdmin授权，需要发工单申请。（如何...
RackNerd美国大硬盘服务器促销：120G SSD+192TB HDD,1Gbps大带宽,月付$599，促销美国月付$服务器促销带宽
racknerd怎么样?racknerd最近发布了一些便宜美国服务器促销，包括大硬盘服务器，提供120G SSD+192TB HDD，有AMD和Intel两个选择，默认32G内存，1Gbps带宽，每个月100TB流量，5个IP地址，月付$599。价格非常便宜，需要存储服务器的朋友可以关注一下。RackNerd主要经营美国圣何塞、洛杉矶、达拉斯、芝加哥、亚特兰大、新泽西机房基于KVM虚拟化的VPS、...
Raksmart VPS主机如何设置取消自动续费
今天有看到Raksmart账户中有一台VPS主机即将到期，这台机器之前是用来测试评测使用的。这里有不打算续费，这不面对万一导致被自动续费忘记，所以我还是取消自动续费设置。如果我们也有类似的问题，这里就演示截图设置Raksmart取消自动续费。这里我们可以看到上图，在对应VPS主机的【其余操作】中可以看到默认已经是不自动续费，所以我们也不要担心被自动续费的。当然，如果有被自动续费，我们确实不想续费的...
ff.163.com为你推荐
-
力学迅雷中國信託商業銀行思科flash我研制千万亿次超级电脑支持ipad重庆网通重庆网通上网资费目前是多少? 小区宽带接入类型的eacceleratorW3S是什么意思css3圆角css实现圆角的几种方法是什么？windows键是哪个Windows键是哪个键啊？重庆电信宽带管家电信的宽带上网助手是什么？