養(yǎng)殖水體水華發(fā)生的原因探討.pdf

1、東北農業(yè)大學碩士學位論文養(yǎng)殖水體水華發(fā)生的原因探討姓名：劉峰申請學位級別：碩士專業(yè)：動物遺傳育種與繁殖指導教師：范兆廷20070620AnInvestigationontheCauseofWaterBloominFishpondAbstractThefournewlyopenedshrimppondsintheXiaoNanhecountryofTianjincitywereinvestigatedfromJtmetoSeptember

2、in2006theplanktoncarriedonqualitativeandthequantitativesampling11他mainphysicochemicalindexofpondthepomwaterofbottomsedimentandnutrientsofbottomsedimentwereinvestigatedsimultaneiWTheeffectofpHvalue、thetemperatureandthelig

3、htSl／_eS$OntheMicrocyst缸aerug#losaw叢studiedTheg印erantmechanismofthewaterbloomWasdiscussedTheexperimentresultsaMasflollows：Thephytoplanktonhas6phylum64speciesintotalCyanophyminprimarilyChlorophymandBaeillariuphymnextandot

4、herspeciesa∞veryfewThecommunitystructureisCyanophytaChlorophytathedominantspeciesw讎Chroococeus、Mierocyst缸aerltg#losa、Merismopediatenuissima，Selenastrumminutum、ScenedesmusquadricaudaandC∞缸F肌Ⅲ$phaericmnTheinvestigationdisc

5、overedthatthefourshrimppondsbelongedtothechloridewatertypeofsaltalkaloidpondThepondwaternutrientindexwhichwasmainlythenitrogenandthephosphorus，discoveredthatthechangetendencyofTNWaSsimilarwithNIhNInthefirstfourweeks，血eni

6、trogengenerallywaslowertheNHNandN03“NstartedtorisinginthefifthweeLThephosphorusalsoincreasedfromtheforthweekTilephosphorusincreoseduedtothecorpseofaquaticanimalsandplants、thewasteofmetabolismandbottomsedimentreleasedThed

7、istrib塒onmadthechangeoftheNHdNcontentinthepomwaterofbottomsedimentmayreflectecologicalstabilizationandshrimpcultureconditionalsomayreflectorganiccontaminativedegreeofshrimpremnantfeed、excretion、otherremnantbodyofaquatica

8、nimalsandplantsiIlthebottomshrimppondn忙concentrationofP043“Pchangetendencywassimilarintheporewalerofbottomsedimentofthefourshrimpandthefluetuantrangew叢0004一o065mg兒111eNH4Naveragecontentis5067mgrL、meN03NaveragecontentisO1

9、77mg，LandtheN02“Naveragecontentis0039mgrLinthepomwaterofbottomsedimentofthefourshrimpTheaveragepercentageoftheNH4Noccupiedtheinorganicnitrogenwas96％，andoccupiedtheTNwas88‰indicatedthattheNH4NcontentWasthehighestinthepore

10、waterofbottomsedimentintheentirecultivatedprocessThecyanobacteriabloomhappenedinthel血、2thand3山pondMicrocystisaeruginosaandMicrocystisflosaquaeWasfoundinthe14pondandMerismopediatenuissimarnainlypresentedin廿1e2mand3血Nutrie