Evaluation of nutrient stoichiometric relationships among ecosystem compartments of a subtropical treatment wetland. Do we have “Redfield wetlands”?  

作　　者：Paul Julian II Stefan Gerber Rupesh K.Bhomia Jill King Todd Z.Osborne Alan L.Wright Matthew Powers Jacob Dombrowski 

机构地区：[1]Soil and Water Sciences Department,University of Florida,Ft.Pierce,FL34945,USA [2]Soil and Water Sciences Department,University of Florida,Gainesville,FL 32611,USA [3]South Florida Water Management District,Water Quality Treatment Technologies,West Palm Beach,FL 33406,USA [4]Whitney Laboratory for Marine Bioscience,University of Florida,St Augustine,FL 32080,USA.

出　　处：《Ecological Processes》2019年第1期267-287,共21页生态过程（英文）

基　　金：sample collection and analysis was provided by the South Florida Water Management District(Contract#4600003031).

摘　　要：Background:Evaluation of carbon(C),nitrogen(N),and phosphorus(P)ratios in aquatic and terrestrial ecosystems can advance our understanding of biological processes,nutrient cycling,and the fate of organic matter(OM)in these ecosystems.Eutrophication of aquatic ecosystems can change the accumulation and decomposition of OM which can alter biogeochemical cycling and alter the base of the aquatic food web.This study investigated nutrient stoichiometry within and among wetland ecosystem compartments(i.e.,water column,flocculent,soil,and aboveground vegetation biomass)of two subtropical treatment wetlands with distinct vegetation communities.Two flow-ways(FWs)within the network of Everglades Stormwater Treatment Areas in south Florida(USA)were selected for this study.We evaluated nutrient stoichiometry of these to understand biogeochemical cycling and controls of nutrient removal in a treatment wetland within an ecological stoichiometry context.Results:This study demonstrates that C,N,and P stoichiometry can be highly variable among ecosystem compartments and between FWs.Power law slopes of C,N,and P within surface water floc,soil,and vegetation were significantly different between and along FWs.Conclusions:Assessment of wetland nutrient stoichiometry between and within ecosystem compartments suggests unconstrained stoichiometry related to P that conforms with the notion of P limitation in the ecosystem.Differences in N:P ratios between floc and soil suggest different pathways of organic nutrient accumulation and retention between FWs.Surface nutrient stoichiometry was highly variable and decoupled(or close to decoupled as indicated by<25%explained variation between parameters),in particular with respect to P.We hypothesize that decoupling may be the imprint of variability in inflow nutrient stoichiometry.However,despite active biogeochemical cycles that could act to restore nutrient stoichiometry along the FW,there was little evidence that such balancing occurred,as the degree of stochiometric decoupling in the water

关 键 词：Decomposition MINERALIZATION EVERGLADES Treatment wetlands 

分 类 号：S15[农业科学—土壤学]