Effects of Macrophyte Functional Group Richness on Emergent Freshwater Wetland Functions

Bouchard, Virginie; Frey, Serita D.; Gilbert, Janice M.; Reed, Sharon E.

doi:10.1890/06-1144.1

Cited by 98 publications

(76 citation statements)

References 38 publications

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“…5, solid line). These data support results of experiments demonstrating no relationship (Joabsson and Christensen, 2001;Ström et al, 2005;Koelbener et al, 2010) or even negative relationship (Bouchard et al, 2007) between CH 4 emission and plant biomass of different species. Thus, the biomass of vascular plants in peatlands cannot alone be a reliable predictor of CH 4 emissions because at least the production (shown by amount of 14 C-label) and transport (total and labeled fluxes) of CH 4 were higher for a plant species with small biomass (Ström et al, 2005;Koelbener et al, 2010).…”

Section: The Fate Of Recent Photosynthates and Their Contribution To supporting

confidence: 90%

Plant-mediated CH4 transport and contribution of photosynthates to methanogenesis at a boreal mire: a 14C pulse-labeling study

Dorodnikov

Knorr

Kuzyakov³

et al. 2011

Biogeosciences

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Abstract. Plant-mediated methane (CH 4 ) transport and the contribution of recent photosynthates to methanogenesis were studied on two dominating vascular plant species -Eriophorum vaginatum and Scheuchzeria palustris -at three types of microrelief forms (hummocks -E. hummocks, lawns -E. lawns and hollows -S. hollows) of a boreal natural minerogenic, oligotrophic fen in Eastern Finland. 14 Cpulse labeling of mesocosms with shoots isolated from entire belowground peat under controlled conditions allowed estimation of plant-mediated CH 4 flux and contribution of recent ( 14 C) photosynthates to total CH 4 . The results showed (i) CH 4 flux increased in the order E. hummocks ≤ E. lawns < S. hollows corresponding to the increasing water table level at the relief microforms as adjusted to field conditions. (ii) Plant-mediated CH 4 flux accounted for 38, 31 and 51 % of total CH 4 at E. hummocks, E. lawns and S. hollows, respectively. (iii) Contribution of recent photosynthates to methanogenesis accounted for 0.03 % for E. hummocks, 0.06 % for E. lawns and 0.13 % for S. hollows of assimilated 14 C. Thus, microsites with S. palustris were characterized by higher rates of transported CH 4 from the peat column to the atmosphere when compared to E. vaginatum of drier lawns and hummocks. Contribution of recent photosynthates to methanogenesis was dependent on the plant biomass within-species level (E. vaginatum at hummocks and lawns) but was not observed between species: smaller S. palustris had higher flux of 14 CH 4 as compared to larger E. vaginatum. Therefore, for the assessment of CH 4 dynamics over Correspondence to: M. Dorodnikov (maxim.dorodnikov@uef.fi) meso-and macroscale as well as for the implication and development of the modeling of CH 4 fluxes, it is necessary to account for plant species-specific differences in CH 4 production, consumption and transport and the attribution of those species to topographic forms of microrelief.

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Section: The Fate Of Recent Photosynthates and Their Contribution To supporting

confidence: 90%

Plant-mediated CH4 transport and contribution of photosynthates to methanogenesis at a boreal mire: a 14C pulse-labeling study

Dorodnikov

Knorr

Kuzyakov³

et al. 2011

Biogeosciences

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“…Several studies have shown an inverse relationship between plant biomass and methane emissions from wetlands, which is often attributed to increased rhizospheric oxygenation and methane consumption with increasing biomass (Strö m et al 2005, Bouchard et al 2007, KaoKniffin et al 2010, Koelbener et al 2010. Our finding that iron reduction was occurring in unamended soils while potential methane production remained barely detectable suggests that another possible explanation for this inverse relationship may be that competition from iron reducing bacteria can inhibit methane production.…”

Section: Discussionmentioning

confidence: 57%

“…Freshwater wetland ecosystems provide a number of valuable services, including biodiversity support, water quality maintenance and improvement, flood control, and carbon storage (Zedler and Kercher 2005). While there are a number of studies documenting changes in wetland biodiversity as a consequence of human activities (Findlay and Houlahan 1997, Findlay and Bourdages 2000, Houlahan and Findlay 2004, Rosas et al 2006, Schooler et al 2006, there have been fewer studies on links between changes in biodiversity and functions that support wetland services (Engelhardt and Ritchie 2001, Mahaney et al 2006, Bouchard et al 2007, Schultz et al 2011.…”

Section: Introductionmentioning

confidence: 99%

“…Growing research indicates that restored and created wetlands do not exhibit or maintain the same functional or physical characteristics, including plant biomass, plant species richness, and biogeochemical functions, as natural wetlands (Zedler et al 2001, Hossler et al 2011, Moreno-Mateos et al 2012. Thus, it is especially important that we understand the role that plant community structure plays in mediating wetland properties such as methane production and oxidation, organic matter dynamics, and plant biomass (Joabsson et al 1999, Engelhardt and Richie 2001, Vann and Megonigal 2003, Bouchard et al 2007.…”

Section: Introductionmentioning

confidence: 99%

“…Previous findings suggest that belowground biomass can increase with functional group richness (the number of functional groups present) as plants from different functional groups penetrate different niches (Bouchard et al 2007). Increases in belowground biomass should lead to greater root turnover and root exudates, which contribute to the pool of available carbon substrates for methanogens and iron reducing bacteria.…”

Section: Introductionmentioning

confidence: 99%

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Plant community structure mediates potential methane production and potential iron reduction in wetland mesocosms

et al. 2013

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Abstract. Wetlands are the largest natural source of methane to the atmosphere, but factors controlling methane emissions from wetlands are a major source of uncertainty in greenhouse gas budgets and projections of future climate change. We conducted a controlled outdoor mesocosm experiment to assess the effects of plant community structure (functional group richness and composition) on potential methane production and potential iron reduction in freshwater emergent marshes. Four plant functional groups (facultative annuals, obligate annuals, reeds, and tussocks) were arranged in a full-factorial design and additional mesocosms were assigned as no-plant controls. Soil samples from the top 10 cm were collected three times during the growing season to determine potential methane production and potential iron reduction (in unamended soils and in soils amended with 200 mM formate). These data were compared to soil organic matter, soil pH, and previously published data on above and belowground plant biomass. We found that functional group richness was less important than the presence of specific functional groups (reeds or tussocks) in mediating potential iron reduction. In our mesocosms, where oxidized iron was abundant and electron donors were limiting, iron reducing bacteria outcompeted methanogens, keeping methane production barely detectable in unamended lab incubations. When the possibility of re-oxidizing iron was eliminated via anaerobic incubations and the electron donor limitation was removed by adding formate, potential methane production increased and followed the same patterns as potential iron reduction. Our findings suggest that in the absence of abundant oxidized iron and/or the presence of abundant electron donors, wetlands dominated by either reeds or tussocks may have increased methane production compared to wetlands dominated by annuals. Depending on functional traits such as plant transport and rhizospheric oxygenation capacities, this could potentially lead to increased methane emissions in some wetlands. Additional research examining the role these plant functional groups play in other aspects of methane dynamics will be useful given the importance of methane as a greenhouse gas.

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Groundwater in the Earth's critical zone: Relevance to large‐scale patterns and processes

Fan

2015

Water Resources Research

194

185

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Although we have an intuitive understanding of the behavior and functions of groundwater in the Earth's critical zone at the scales of a column (atmosphere-plant-soil-bedrock), along a toposequence (ridge to valley), and across a small catchment (up to third-order streams), this paper attempts to assess the relevance of groundwater to understanding large-scale patterns and processes such as represented in global climate and Earth system models. Through observation syntheses and conceptual models, evidence are presented that groundwater influence is globally prevalent, it forms an environmental gradient not fully captured by the climate, and it can profoundly shape critical zone evolution at continental to global scales. Four examples are used to illustrate these ideas: (1) groundwater as a water source for plants in rainless periods, (2) water table depth as a driver of plant rooting depth, (3) the accessibility of groundwater as an ecological niche separator, and (4) groundwater as the lower boundary of land drainage and a global driver of wetlands. The implications to understanding past and future global environmental change are briefly discussed, as well as critical discipline, scale, and data gaps that must be bridged in order for us to translate what we learn in the field at column, hillslope and catchment scales, to what we must predict at regional, continental, and global scales.

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Effects of Macrophyte Functional Group Richness on Emergent Freshwater Wetland Functions

Cited by 98 publications

References 38 publications

Plant-mediated CH<sub>4</sub> transport and contribution of photosynthates to methanogenesis at a boreal mire: a <sup>14</sup>C pulse-labeling study

Plant-mediated CH<sub>4</sub> transport and contribution of photosynthates to methanogenesis at a boreal mire: a <sup>14</sup>C pulse-labeling study

Plant community structure mediates potential methane production and potential iron reduction in wetland mesocosms

Groundwater in the Earth's critical zone: Relevance to large‐scale patterns and processes

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Effects of Macrophyte Functional Group Richness on Emergent Freshwater Wetland Functions

Cited by 98 publications

References 38 publications

Plant-mediated CH&lt;sub&gt;4&lt;/sub&gt; transport and contribution of photosynthates to methanogenesis at a boreal mire: a &lt;sup&gt;14&lt;/sup&gt;C pulse-labeling study

Plant-mediated CH&lt;sub&gt;4&lt;/sub&gt; transport and contribution of photosynthates to methanogenesis at a boreal mire: a &lt;sup&gt;14&lt;/sup&gt;C pulse-labeling study

Plant community structure mediates potential methane production and potential iron reduction in wetland mesocosms

Groundwater in the Earth's critical zone: Relevance to large‐scale patterns and processes

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Resources

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Plant-mediated CH<sub>4</sub> transport and contribution of photosynthates to methanogenesis at a boreal mire: a <sup>14</sup>C pulse-labeling study

Plant-mediated CH<sub>4</sub> transport and contribution of photosynthates to methanogenesis at a boreal mire: a <sup>14</sup>C pulse-labeling study