石羊河流域作物蒸發(fā)蒸騰量時空分異規(guī)律的研究.pdf

1、西北農(nóng)林科技大學(xué)碩士學(xué)位論文石羊河流域作物蒸發(fā)蒸騰量時空分異規(guī)律的研究姓名：佟玲申請學(xué)位級別：碩士專業(yè)：農(nóng)業(yè)水土工程指導(dǎo)教師：康紹忠20040501AbstractShiyangRiverBasinisoneofthethreelargestinteriorriverbasinsintheHexiCorridorofNorthwestChinawiththedevelopmentofindustryandagriculturewater

2、demandincreaseddramaticallyandcontradictionofwatersupplyanddemandbecamemoreandmoresevere.“Noirrigationnoagriculture“isatypicaltraitforShiyangRiverBasinandagricultureisaleadingwaterconsumer.In2000thetotalconsumptionofalls

3、ocialandeconomicdepartmentswas2.854billionm3amongit2.455billionm3wasconsumedonirrigationwhichamountedto86.02%ofthetotalwatervolume.Studyontemporalandspatialdistributionofregionalcropevapotranspirationisofgreatscientifics

4、ignificanceonimprovingbenigncycleofcompoundsystemofwaterresourcesecologyeconomysocietyrealizingsustainabledevelopmentofagricultureinthebasinandsustainableutilizationofwaterresourcesinaridareas.Thefollowingcontentswerestu

5、diedinthethesis:①ThemeteorologicalfactorsvariationtrendofShiyangRiverBasinintherecent50yearswasanalyzed.ExcepttheprecipitationofTianzhustationbasicallyhadnovariationmeantemperaturemeanmaximumtemperatureandprecipitationof

6、otherstationsallshowedatrendofincrease.SunshinehoursofGulanghadunobviousincreaseandthoseofLiangzhouhadunobviousdecreasewhilethoseofotherstationsallhadobviousincreaseAnnualevaporationofGulanghadatrendofincreasewhichwascon

7、trarytothatofotherstations.VariationofaveragerelativehumidityofeverystationwasnotobviousaveragewindspeedofGulangwasrelativelystablethatofTianzhuincreasedobviouslyandthatofotherstationsdeclinedveryobviously②PenmanMonteith

8、methodwhichrecommendedinFAO56wasadoptedtocalculatemonthlyETDofShiyangRiverBasinanditsnearbystationsoveryears.ItcanbedrawnthatETDofShiyangRiverBasinvariedrelativelysignificantovermonthsandtotalETDfromMaytoAugustcoveredala

9、rgepercentagetoabout50%oftotalETDofawholeyear.ThevariationofETDoveryearswasalsorelativelygreatexceptthatofLiangzhouandSunanshowedatrendofsignificantdecreaseoveryearsthatofotherstationsallshowedaninversetrendofincrease.ET

10、DofGulangreachedpeakvaluestepbystepafteritslowervalueinlater1970sandthatofMinqinTianzhuYongchangwaslowinlater1980swhilethatofLiangzhouandSunanwaslowinlater1980sandthatofeverystationin1990sincreasedtosomeextentcomparedwit