nitrogen, phosphorus, and eutrophication in the coastal marine environment

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1、REPORTSphosphorusratiosbyatomsinculturesofChlorellapyrenoidosaof5.6:1forNitrogen,Phosphorus,andEutrophicationnormalcells,30.9:1forphosphorus-deficientcells,and2.9:1fornitrogen-intheCoastalMarineEnvironmentdeficientcells.Anumberofsubsequentstudiesofbothalgalcultures(6,7)Abst

2、ract.Thedistributionofinorganicnitrogenandphosphorusandbioassayandoceanicparticulatematter(8,9)experimentsbothshowthatnitrogenisthecriticallimitingfactortoalgalgrowthhavereportedhighlyvariableratiosofandeutrophicationincoastalmarinewaters.Abouttwicetheamountofphosphatenitro

3、gentophosphorus.Theseratiosascanbeusedbythealgaeisnormallypresent.ThissurplusresultsfromthOlowaresomewhatdifficulttointerpretinnitrogentophosphorusratiointerrigenouscontributions,includinghumanwaste,oceanicparticulatematter,sincelivingandfromthefactthatphosphorusregenerates

4、morequicklythanammoniafromalgaemaycompriseaverysmallfrac-decomposingorganicmatter.Removalofphosphatefromdetergentsisthereforetionofthetotalparticulateorganicnotlikelytoslowtheeutrophicationofcoastalmarinewaters,anditsreplacementmattercollectedbytheusualsamplingwithnitrogen-

5、containingnitrilotriaceticacidmayworsenthesituation.methods,andtheoriginandnatureoftheremainingmaterialarelargelyun-Thephotosyntheticproductionofplankton.Thisrelationshipmayhaveknown.Ontheotherhand,thechemi-organicmatterbyunicellularalgaeresultedfromadaptationoftheorga-calc

6、ompositionofalgaegrowninthe(phytoplankton)inthesurfacelayersnismstotheenvironmentinwhichusualculturemediumsmaydiffersigni-oftheseaisaccompaniedby,isindeedtheylive,butRedfieldsuggestedaficantlyfromthatofnaturallyoccur-madepossibleby,theassimilationofmechanism,themicrobialfix

7、ationofringorganisms.Despitetheseuncer-inorganicnutrientsfromthesurround-elementarynitrogen,whichcouldregu-tainties,thefollowinggeneralizationsingwater.Mostofthesesubstanceslatetheleveloffixednitrogeninthemaybemade:(i)ratiosofnitrogenarepresentatconcentrationsgreatlysearela

8、tivetophosphorustothesametophosphorusfromlessthan3:1toinexcessoftheplants'needs,bu