Regulation of carbon processes by macrophyte species in a Great Lakes coastal wetland

Rothman, Erin; Bouchard, Virginie

doi:10.1672/0277-5212(2007)27[1134:rocpbm]2.0.co;2

Cited by 37 publications

(34 citation statements)

References 36 publications

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“…To date, much of our knowledge of plant decay processes in freshwater marshes comes from traditional litter bag studies that were conducted at or within the marsh sediments or overlying surface waters (Polunin 1984;Rothman and Bouchard 2007;Fennessy et al 2008). Furthermore, many of these studies examined decay patterns using plant material that had been prematurely harvested (living green or recently senesced) manipulated (e.g., oven-dried), or both-a widespread practice that continues even today (Rothman and Bouchard 2007;Fennessy et al 2008). These methodological approaches eliminate, either partially or completely, the initial standing decay phase and often lead to serious artifacts (e.g., altered Table 2.…”

Section: Discussionmentioning

confidence: 99%

Contributions of fungi to carbon flow and nutrient cycling from standing dead Typha angustifolia leaf litter in a temperate freshwater marsh

Kuehn

Ohsowski

Francoeur

et al. 2011

Limnology & Oceanography

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Standing dead plant litter often constitutes a large fraction of the detritus in many freshwater marshes and lake littoral habitats. Despite this evidence, microbial decay processes in standing litter and its contribution to wetland carbon and nutrient cycling have rarely been quantified. We examined the contribution of fungi to carbon flow and nutrient cycling from Typha angustifolia during senescence and standing litter decomposition. Naturally standing Typha leaves were collected in August and then periodically over 1 yr. We quantified losses in leaf carbon (C), fungal biomass, and fungal production rates and constructed a partial budget estimating C flow into fungal decomposers. Additionally, we determined leaf litter N and P concentrations to assess the effect of fungi on detrital nutrient dynamics. Significant losses in leaf C occurred during plant senescence and standing litter decay (, 55%). Fungal biomass increased during litter decay, reaching a maximum of 106 6 7 mg C g 21 detrital C. Cumulative fungal production totaled 123 mg C g 21 initial detrital C, indicating that 22% of the Typha leaf C lost was assimilated into fungal biomass. Fungi also transformed and immobilized nutrients within Typha leaves, with fungal N and P accounting for . 50% of the total detrital N and P during later stages of leaf decay. Significant transformation and decomposition of emergent macrophyte litter occurs during the standing dead phase, and a large portion of the plant C and nutrients are channeled into and through fungal decomposers.

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Section: Discussionmentioning

confidence: 99%

Contributions of fungi to carbon flow and nutrient cycling from standing dead Typha angustifolia leaf litter in a temperate freshwater marsh

Kuehn

Ohsowski

Francoeur

et al. 2011

Limnology & Oceanography

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“…Increasingly, studies have focused on the processes that influence soil C accumulation (Connor et al 2001;Chmura et al 2003;Craft 2007) and species effects on soil carbon storage (Rothman and Bouchard 2007;Mahaney et al 2008) and marsh accretion (Rooth et al 2003). Primary production (Blum 1993) and decomposition (Craft 2007;Rothman and Bouchard 2007) have both been suggested to be the predominant biotic process regulating soil carbon content and accumulation. There is significant spatial variability in soil C accumulation in wetlands, which has been associated with differences in sediment deposition rate (Khan and Brush 1994;Chmura et al 2003), but the nature of C burial is not fully understood.…”

Section: Introductionmentioning

confidence: 99%

Salt Marsh Carbon Pool Distribution in a Mid-Atlantic Lagoon, USA: Sea Level Rise Implications

et al. 2011

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The distribution of carbon (C) within a salt marsh may vary among vegetation zones depending on production and decomposition dynamics and organic and mineral depositional history. We examined spatial and temporal variation of plant and soil C pools within a salt marsh fringing a coastal lagoon along the mid-Atlantic coast of the U.S. The total plant C pool increased from high marsh shrub to low marsh grass dominated areas. Much of the spatial variation in plant C pool was due to fine roots and small organic matter (dlm) that could not be identified by species, which averaged 2398 gC m −2 in Spartina patens-dominated, 2215 gC m −2 in Spartina alternifloradominated, and 676 gC m −2 in Juncus roemerianusdominated areas. Belowground C pool loss was 36% less for S.patens than S.alterniflora and was similar between S. alterniflora and J.roemerianus. Accretion and C accumulation rates were greater in the S.alterniflora-dominated stand than in the J.roemerianus-dominated stand. Our results suggest that landward migration onto terrestrial soils can lead to an estimated 80% increase in belowground plant C composed primarily of fine roots and dlm and 36-70% increase in soil carbon between 15 and 30 cm depths.

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“…Despite similarities between Typha spp. and Phragmites australis biomass composition, Rothman and Bouchard (2007) observed differences in C utilization patterns in wetland soils invaded by these two plant species. Marchante et al (2008) attributed alterations in soil microbial diversity following Acacia longifolia invasion to deposition of N-rich litter by the invading legume.…”

Section: Introductionmentioning

confidence: 81%

“…The impact of such shifts in vegetation composition on soil functions is an ecological issue that has been the focus Rothman and Bouchard 2007;Marchante et al 2008), but important questions remain with respect to processlevel understanding of the factors associated with soil responses to plant invasion. Such responses include alteration of the soil microbial community which in turn could affect important soil processes such as litter decomposition.…”

Section: Introductionmentioning

confidence: 99%

“…Variable effects (positive, Liao et al 2007; neutral, Rothman and Bouchard 2007; negative, Hook et al 2004) of plant invasion on soil organic C (SOC) stocks have been reported. At a south-central Indiana wetland, larger SOC pools were recorded in P. arundinacea-invaded areas than under native vegetation, but plant biomass production and composition could not explain the results (Bills 2008).…”

Section: Introductionmentioning

confidence: 99%

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Size, activity and catabolic diversity of the soil microbial biomass in a wetland complex invaded by reed canary grass

2009

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Reed canary grass (Phalaris arundinacea, L.) invasion of wetlands is an ecological issue that has received attention, but its impact on soil microbial diversity is not well documented. The present study assessed the size (substrate-induced respiration), catabolic diversity (CLPP, community level physiological profiles) and composition (selective inhibition) of the soil microbial community in invaded (>95% P. arundinacea cover) and in non-invaded areas of a wetland occupied by native species grown either as a mixed assemblage (22 species) or as quasi-monotypic stands of Scirpus cyperinus (74% cover). The study also tested the hypothesis that decomposition of ligninand phenolics-rich plant tissues would be fastest in soils exhibiting high catabolic diversity. Results showed that soil respiration, microbial biomass and diversity were significantly higher (P<0.03; 1.5 to 3 fold) in P. arundinacea-invaded soils than in soils supporting native plant species. Fungal to bacterial ratios were also higher in invaded (0.6) than in noninvaded (0.4) plots. Further, canonical discriminant analysis of CLPP data showed distinct communities of soil decomposers associated with each plant community. However, these differences in microbial attributes had no effect on decomposition of plant biomass which was primarily controlled by its chemical composition. While P. arundinacea invasion has substantially reduced plant diversity, this study found no parallel decline in the size and diversity of the soil microbial community in the invaded areas.

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Regulation of carbon processes by macrophyte species in a Great Lakes coastal wetland

Cited by 37 publications

References 36 publications

Contributions of fungi to carbon flow and nutrient cycling from standing dead Typha angustifolia leaf litter in a temperate freshwater marsh

Contributions of fungi to carbon flow and nutrient cycling from standing dead Typha angustifolia leaf litter in a temperate freshwater marsh

Salt Marsh Carbon Pool Distribution in a Mid-Atlantic Lagoon, USA: Sea Level Rise Implications

Size, activity and catabolic diversity of the soil microbial biomass in a wetland complex invaded by reed canary grass

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