降雨对橘园集水区池塘水体氮负荷的影响
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中图分类号：P426.6；X52 文献标志码：A 文章编号：1672-2043（2025）07-1804-09
doi：10.11654/jaes.2024-0633
Effectsof rainfallonnitrogenloads inpondsincitrusorchardcatchments
XIAO Hengbin'， ZHOU Jinyan'， ZHENG Yong"， YUAN Zheng'，ZHAO Yaoyao'， LUO Yue'， HU Ronggui'， LIN Shan" （1.KeyLaboratoryofArableLandConservationinMiddeandLowerReachesofYngtzeRiver，MinistryofAgricultureandRuraffairs， ColegeofResouesandEnvioment，HuazongAgriculturalUniversityWuhan43Oo，Chia;2.PowerChinaKunmingEin CorporationLimited，Kunming50o1hina;3.tateKeyLboratoryofSoiladustaiableAgriculture，hangshuatiolgo EcosystemOevationadeseachation，IsiteofSoiliene，eecademyofenes，jng5a）
Abstract：InordertostudytheeffctsofrainfallonNpolutionofpondwateranditsdrivingmechanisms，thissudyselected8ponds locatedncitrusorchardcatchmentsinteBaihewanwatershdinthemidlereachsoftheYangtzeRiverwereselectedasteseach objects.Thegsiodterepthtotalrograterg（O-），or（-）drtie （PN）concentrationsbeforeandaftersixrainfalleventsweremonitored.Analyzethechangesinntrogenladsinpondsandtheirresponse torainfallandcatchmentarea，slopeandchangesinpondwatervolume.TheresultsshowedthatNconcentrationsinpondsgeealy increasedafterrainfall，speciallyinPN，withthePNconcentratioofodO3showingthelargestincreaseafterall（ 147% ）. The N loadsnpondsgraduallyincreasedwiththeincreaseofrainfallevelsandshowedsignificantdiferencs.Inthcaseofmoderateain， heavy rain，rainstorm and heavy rainstorm，the average TN load was 7.O6，10.12，20.22 kg·hm-2，and 34.62kg⋅hm-2 ，respectively. NO3-N was the main form of N，with the highest proportion（ 71% ）inTNunder heavyrain conditions.The proportionof NH4-N in TN increased from （204号 8% to 19 % withincreasingrainfallevels.Thestructuralequationmodelshowedthatrainfallandslopeshowedasignificantdirectpositive impactonNloadsinponds，andcouldalsobeincreasedbyincreasingpondwatervolume.Thecatchmentareawassignificantlyand negativelycorelatedwitNloads，indicatingthatsalercatchmentstrasportedoreNfuxtoods.ThewoleresultsshowdthatN pollutioningallyhall，iPoeall.Afallved pondsNH4-NloadsincreasedmostsignificantlyfterainfallBothrainfallandslopecontributedtopondsNloads，whilecatchntarea had a negative effect on N loads.
KeyWords：rainfall;citrus orchard; ponds; nitrogenloads;PartialLeastSquares StructuralEquation Modeling（PLS-SEM）
降雨过程中土壤释放的颗粒物和N负荷会随着流量的增加而增加，从而导致相邻水体中养分水平发生变化。（剩余15664字）
