Page 102 - 《水资源与水工程学报》2022年第3期
P. 102

!33 " ! 3 #                       & ' ( ) & * + , -                               Vol.33No.3
               2022 $ 6 %               JournalofWaterResources&WaterEngineering                 Jun.,2022

            DOI:10.11705/j.issn.1672-643X.2022.03.13


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                 8IBJK:TV697.3 9;X52   LMNOP:A    LQRK:1672643X(2022)03009808
                    Releasecharacteristicsofhydrolyzednitrogenandphosphorusfrom

                           dominantplantsinSanhekouReservoirdrawdownzone

                                                HEJiang,FENGMinquan
             (StateKeyLaboratoryofEcohydraulicsinNorthwestAridRegionofChina,Xi’anUniversityofTechnology,Xi’an710048,China)
                 Abstract:Theindoorhydrolysissimulationexperimentwascarriedoutwiththeabovegroundstemsand
                 leavesoffivedominantplantsinthedrawdownzoneofSanhekoureservoir,namely,Artemisiacarvifolia
                 Buch-Ham,ArtemisiaargyiLevl.etVan,EcliptaprostrataL.,Bechmanniasyzigachne(Steud.)
                 FemandPolygonumlapathifoliumL.asthesamplesandthereservoirwaterastheexperimentalrawwa
                 ter.Bymeasuringthebasicwaterqualityindicesandthenutrientconcentrationofnitrogenandphosphor
                 usoftheoverlyingwater ,weinvestigatedtheimpactoftheplantsinthedrawdownzoneonthewateren
                 vironmentandthereleasecharacteristicsandloadofdifferentformsofnitrogenandphosphorusnutrients
                 afterhydrolysis.Theresultsshowedthatwhenthesefiveplantswereinundated,thecoloroftheoverlying
                 waterdeepened ,peculiarsmelloccurred,pHvaluedecreased,turbidityincreased,electrolyticratein
                 creasedanddissolvedoxygendecreased ;nitrogenandphosphorusnutrientswerereleased,andtheaver
                 agereleaseamountsoftotalnitrogenandtotalphosphoruswere4.06mg/gand0.78mg/g ,respectively,
                 amongwhich,theparticulatenitrogenandphosphorusaccountedfor43.2% and36.2% oftotalnitrogen
                 andtotalphosphorus ,respectively;attheinitialstageofreservoirimpoundment(30d),thenitrogenand
                 phosphorusloadreleasedbyvegetationinthedrawdownzonetothewaterbodycanreach40.4kg/hm     2
                              2
                 and7.6kg/hm,whichinturnwillaffectthewaterenvironmentsafetyoftheSanhekouReservoir.
                 Keywords:reservoirdrawdownzone;planthydrolysis;nitrogenandphosphorus;waterenvironment;
                 SanhekouReservoir

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