1994 - Boumans, Day - Effects of two louisiana marsh management plans on water and materials flux and short-term sedimentation

1994 - Boumans, Day - Effects of two louisiana marsh management plans on water and materials flux and short-term sedimentation

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1、WETLANDS,Vol.14,No.4,December1994,lap.247-261©1994,TheSocietyofWetlandScientistsEFFECTSOFTWOLOUISIANAMARSHMANAGEMENTPLANSONWATERANDMATERIALSFLUXANDSHORT-TERMSEDIMENTATIONRoelofM.BoumansJacksonEstuarineLaboratoryUniversityofNewHampshireDurham,NewHampshire03824-3427JohnW.Day

2、,Jr.DepartmentofOceanographyandCoastalSciencesandCoastalEcologyInstituteLouisianaStateUniversityBatonRouge,Louisiana70803Abstract:TheimpactoftwocoastalLouisianamarshmanagementplansonwaterandmaterialsflux,short-termsedimentation,andseveralsoilparameterswasevaluatedbetweenMa

3、y1989andJanuary1990.ThestudywascarriedoutintheFina-LaterreMarshManagementAreaandtheRockefellerStateWildlifeRefugeinmanagedandunmanagedareas.Waterandmaterialfluxwasmeasuredeachtwohoursduringtwelve48hfluxstudies,andnetfluxesperm2ofdrainageareawerecalculatedforwater,totalsusp

4、endedsediments,salinity,N03+NO2,PO4,andNH4.Short-termsedimentationwasmeasuredastheweightofmaterialdepositedover2--4weekintervalsonpetridishesplacedonthemarshsurface.Themanagedsitesexperiencedconsiderablereductionsintotalwaterexchange,leadingtoreductionsinnetmaterialexchang

5、es.Whenexpressedonaperm2basis,themanagedwetlandsaremuchlesstightlycoupledtothesurroundingestuarycomparedtotmmanagedareas.Withinthecontextofageneraldecreaseofexchange,thetwomanagedareasonaverageexportmaterialstotheestuary.Inthemanagedareas,theresultssuggestthatmanagementcan

6、leadtoreducedsalinityandalossofsedimentsandnutrients.Short-termsedimentationwaslessatthemanagedareas;expressedasgm-2d~,totalsedimentationrateswere0.57forFinamanaged,1.02forFinaunmanaged,1.68forRockefellermanaged,and3.82forRockefellerunmanaged.SoilPwaslowerandsoilorganicmat

7、terwashigheratthemanagedareas.Organicmatterinthesoilwaslowcomparedwithrecentlydepositedmaterial,suggestingthatmostorganicmatterdepositedonthesurfaceofthemarshislostthroughdecomposition.Reductionoffloodingduringstormeventsisthelikelymechanismleadingtoreducedsedimentationont

8、hemarshsurfaceinthemanagedareas.KeyWords:marshmanagement,Louisiana,materialflux,tidalmars

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