Nutrients particulate organic

The quantity of primary production that is exported from the upper ocean is said to be equivalent to new production (18, 19) New primary production is that associated with allocthonous nutrients (i.e., those upwelled or mixed into the euphotic zone or input via rivers and rain). In order for steady state to be maintained, an equivalent flux out of the euphotic zone is required. Earlier studies (19) suggested that sediment-trap measurements of particulate organic carbon (POC) flux were equivalent to new primary production however, recently it has become clear that these measurements probably represent only a... 

Murray JW, Downs JN, Stroms S, Wei C-L, Jannasch HW (1989) Nutrient assimilation, export production and scavenging in the eastern equatorial Pacific. Deep-Sea Res 36 1471-1489 Murray JW, Young J, Newton J, Dunne J, Chapin T, Paul B, McCarthy JJ (1996) Export flux of particulate organic carbon from the Central Equatorial Pacific determined using a combined drifting trap- " Th approach. Deep-Sea Res II43 (4-6) 1095-1132... 

Particulate organic matter LF — 2-18% of organic C, 1-16% of total N SSF - 20 45% of organic C and 13-40% of total N Partially decomposed plant litter isolated by density fractionation (LF) or sieving (SSF). Substrate and centre for soil microbial activity, short-term reservoir of nutrients, food source for earthworms and other soil fauna and focci for formation of water stable aggregates. 

Nutrient regeneration The process whereby particulate organic nitrogen and phosphorous are transformed into dissolved inorganic species, such as nitrate and phosphate. Microorganisms are largely responsible for this process. 

Vertical segregation The vertical gradient in biogenic materials, such as nutrients and O2, that is established by the interaction between the biogeochemical cycling of particulate organic matter and the vertical density stratification of the water column. Strongest at mid and low latitudes. 

France, R., H. Culbert, and R. Peters. 1996. Decreased carbon and nutrient input to boreal lakes from particulate organic matter following riparian clear-cutting. Environmental Management 20 579-583. 

Stelzer, R. S., Heffeman, J. Likens, G. E. (2003). The influence of dissolved nutrients and particulate organic matter quality on microbial respiration and biomass in a forest stream. Freshwater Biology, 48, 1925-37. 

Graneli, E., Carlsson, P., and Legrand, C. (1999). The role of C, N, and P in dissolved and particulate organic matter as a nutrient source for phytoplankton growth, including toxic species. Aquat. Ecol. 33, 17-27. 

Evrard, V., Kiswara, W., Bouma, T. J., and Middelburg, J. J. (2005). Nutrient dynamics of seagrass ecosystems N evidence for the importance of particulate organic matter and root systems. Mar. Ecol. Prog. Ser. 295, 49—55. 

Crossland, C.J., and Barnes, D.J. (1983). Dissolved nutrients and organic particulates in water flowing over coral reefs at Lizard Island. Aust. J. Mar. Freshwater Res. 34, 835-844. 

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