28780.黃河上游龍羊峽劉家峽河段水生生物多樣性研究及生態(tài)系統(tǒng)健康評價

1、西北大學碩士學位論文黃河上游龍羊峽劉家峽河段水生生物多樣性研究及生態(tài)系統(tǒng)健康評價姓名：馮慧申請學位級別：碩士專業(yè)：動物學指導教師：楊興中20090530AbstractAbstractAccordingtotheaquaticbiodiversitydataduring20052008inHuangheupperreachfromLongyangxiatoLiujiaxia，comparedwiththehistroydata，thes

2、pecies，populationquantityShannon—Weaverindex，andthechangesoftheseindexeswereanalyzedanddiscussedAndonthisbasis，theriverecosystemhealthwasevaluatedTheresultsshowedthat35speciesoffishinthereachfromLongyangxiatoLiujiaxiaand

3、themostofthemwerecyprinidae，whichhad16speciesThesecondlywereloaches，whichhad13speciesComparedwiththehistorydata，thespeciesoffishreduced7speciesandadded14speciesTheaboriginalfishpopulationtakesondowntrendandtheforeignfish

4、populationtakesonuptrendTherewere7phylaand116speciesofphytoplanktonbymicroscopyandmostofthemwerechlorophytathesecondlywerediatomThedominantspecieswereSynedraNitzsschiaclosterium，Navicula，Closterium，SchroederiaandCeratium

5、ThequantityofphytoplanktonWas006X104～1208104ind／L，thedensityofphytoplanktonWas0000903029mg／LIndicatororganismandbiologicaldiversityindicesareusedtoevaluatethedegreeofwaterqualityTheresultsshowsthatthewaterqualityislow—gr

6、adepollutedTherewere4classesand50speciesofzooplanktonbymicroscopyandmostofthemwereprotozoa，whichhad24speciesThesecondlywererotiferwhichhad18speciesThequantityofzooplanktonWas12～1174ind／Landthedensityofzooplanktonwas00000

7、6““03926mg／LTheecosystemhealthofreachfromLongyangxiatoLiujiaxiahadbeenevaluatedbyfishIBI，diversityindexofplankton，waterquantityandwaterqualityTheresultsshowedthattheecosystemhealthWasinthelevelofsubhealthconditionsThemai

8、nfactorseffectedtheecosystemhealthwerethevegetationdegradationofriparianzone，thedevelopmentutilizationofwaterresourcestoohigh，thesurvivalconditionsofaboriginalfishpoorKeywords：phytoplankton；zooplankton；fishIBI；HuangheRiv