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:1672643X(2022)03009808
Releasecharacteristicsofhydrolyzednitrogenandphosphorusfrom
dominantplantsinSanhekouReservoirdrawdownzone
HEJiang,FENGMinquan
(StateKeyLaboratoryofEcohydraulicsinNorthwestAridRegionofChina,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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