Supplement and Consumption of Dissolved Oxygen and Their Seasonal Variations in Shrimp Pond-中国期刊网

摘要 OnthebasisoftheresearchofDObudgetorkineticsinshrimppond,themaininfluenceprocessofDOanditsseasonalvariationsarequantitativelydescribedthroughredividingthebudgetprocessandmodifyingthequantitativemethodoftheprocess.Thepercentagesofoxygendemandofvariousprocessesinthetotaloxygendemandaredifferentinshrimpcultivationseasons.Itisshowedthatthedissolvedoxygendemandofmini-organismsisthemajoraffectedfactorofDOinthisenvironmentandapproximatelyaccountsfor64.1～74.1%ofthetotaloxygendemand.Intheearlyperiodofshrimpculture,thedissolvedoxygendemandofallotrophicbacteriadegradingorganicmattersismuchlowerthanthatofphytoplanktonrespiration.Butinthemidterrnandlaterperiod,itisabout50%ofthetotaloxygendemandbecauseofthehigherwatertemperatureandmoreseriousself-pollution.Thedissolvedoxygendemandofsedimentislowerandjust19.1～28.8%,whilethepercentageofshrimpoxygendemandislower.TheeffectofphytoplanktononDOinshrimpculturingwaterhasdualism.Oneistheoxygenproducingprocessofphotosynthesisandtheotheristheoxygenconsumptionprocessofrespiration.Itisestimatedthatthedissolvedoxygendemandofphytoplanktonrespirationisapproximatelyone-fifthoftheoxygenproducedbyphotosynthesisundernormalilluminationconditions.Thedissolvedoxygendemandofallotrophicbacteriadegradingorganicmattersandthetotaloxygendemandofsedimentincrease4timesand1.7timesrespectivelyfromtheearlyperiodtothemidtermandlaterperiod.Obviously,theDOofculturingwatercanbealsogreatlyimprovedbycontrollingtheselfpollutionoforganicmattersduringshrimpculture.

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Supplement and Consumption of Dissolved Oxygen and Their Seasonal Variations in Shrimp Pond

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Supplement and Consumption of Dissolved Oxygen and Their Seasonal Variations in Shrimp Pond

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