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Title: Neotropical peatland methane emissions along a vegetation and biogeochemical gradient

Authors:
ORCiD logo; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1400440
Grant/Contract Number:
SC0012272
Resource Type:
Journal Article: Published Article
Journal Name:
PLoS ONE
Additional Journal Information:
Journal Volume: 12; Journal Issue: 10; Related Information: CHORUS Timestamp: 2017-10-20 13:40:17; Journal ID: ISSN 1932-6203
Publisher:
Public Library of Science (PLoS)
Country of Publication:
United States
Language:
English

Citation Formats

Winton, R. Scott, Flanagan, Neal, Richardson, Curtis J., and Rinnan, ed., Riikka. Neotropical peatland methane emissions along a vegetation and biogeochemical gradient. United States: N. p., 2017. Web. doi:10.1371/journal.pone.0187019.
Winton, R. Scott, Flanagan, Neal, Richardson, Curtis J., & Rinnan, ed., Riikka. Neotropical peatland methane emissions along a vegetation and biogeochemical gradient. United States. doi:10.1371/journal.pone.0187019.
Winton, R. Scott, Flanagan, Neal, Richardson, Curtis J., and Rinnan, ed., Riikka. 2017. "Neotropical peatland methane emissions along a vegetation and biogeochemical gradient". United States. doi:10.1371/journal.pone.0187019.
@article{osti_1400440,
title = {Neotropical peatland methane emissions along a vegetation and biogeochemical gradient},
author = {Winton, R. Scott and Flanagan, Neal and Richardson, Curtis J. and Rinnan, ed., Riikka},
abstractNote = {},
doi = {10.1371/journal.pone.0187019},
journal = {PLoS ONE},
number = 10,
volume = 12,
place = {United States},
year = 2017,
month =
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1371/journal.pone.0187019

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  • This study measured methane (CH{sub 4}) emissions by a static chamber technique from a wide range of sites (pH 3.9 - 7.0) in a peatland complex near Thompson, Manitoba in the Boreal Ecosystem - Atmosphere Study (BOREAS). The objectives were to identify environmental controls on CH{sub 4} emission rates, determine their spatial and temporal variability, and examine the change in CH{sub 4} emission associated with the evolution of permafrost, palsas, and collapse scars. Peak CH{sub 4} fluxes ranged from 0 in the palsas and treed peat islands to 1200 mg m{sup -2} d{sup -1} in the open sedge-rich fens andmore » saturated lagg areas of collapse scars, where permafrost was actively degrading. The greatest variability in fluxes occurred in flooded sites where ebullition was a transport mechanism. Depth to water table and peat temperature at the average water table position explained most of the variability in CH{sub 4} fluxes, with plant composition and density, substrate type, and the CH{sub 4} production/consumption potentials of the various peats as additional factors. CH{sub 4} flux did not vary with pH in the field since water table position and temperature were overriding controls.« less
  • The goals of this study were to: (1) measure methane (CH{sub 4}) emissions from peatland soils, (2) improve process models of peatland-atmospheric methane exchange by identifying environmental controls on methane emission, and (3) provide a method of extending CH{sub 4} emissions data from the laboratory to the landscape scale by determining the relationships between plant associations and CH{sub 4} flux. Sites representing a range of parameters were selected for CH{sub 4} sampling and analyses. Linear regression of concentration changes was used to calculate CH{sub 4} flux. In general, calculated methane emissions were larger than those reported for other boreal wetlandmore » sites at a similar latitude. The range of flux measurements showed spatial variation within and among sites as well as seasonal variation among sites. Open graminoid fens had the highest mean seasonal flux, while treed sites had the lowest mean flux. To determine the effects of environmental variables, data on seasonal patterns of water table position and peat temperature were collected and analyzed statistically. A correlation between peat temperature and water table position was observed. A predictive model for methane flux and environmental variables using multiple stepwise regression was developed. The model showed a negative correlation of CH{sub 4} flux with height above mean water table, and a weak correlation of flux with chemistry. The results of the study indicate that multivariate vegetation analyses may be a useful tool for accounting for environmental controls on methane flux and applying chamber measurements to the landscape scale using remote sensing. 43 refs., 8 figs., 3 tabs.« less
  • Measurements were taken in 15 communities along the elevation gradient from fir forest at high elevations, through pine forest, woodlands, and desert grassland, to deserts at low elevations in the Santa Catalina Mountains, Arizona, and in a Cercocarpus shrubland on limestone. Eight small-tree and shrub species of woodlands and deserts were subjected to dimension analysis by the Brookhaven system. Aboveground biomass decreased along the elevation gradient from 36--79 dry kg/m/sup 2/ in fir and Douglas-fir forest to 0.26--0.43 kg/m/sup 2/ in the desert grassland and two desert samples. Net aboveground primary productivity similarly decreased from 1,050--1,150 g/m/sup 2/ . yrmore » in mesic high-elevation forests to 92-140 g/m/sup 2/ . yr in desert grassland and deserts. Both biomass and production show a two-slope relation to elevation (and, probably, to precipitation), with a steeper decrease from the high-elevation forests to the mid-elevation woodlands, and a less steep decrease from dry woodlands through desert grassland into desert. The two groups of communities at higher vs. lower elevations also show different relations of leaf area index and chlorophyll to elevation and to productivity. The two groups may represent different adaptive patterns: surface-limiting, with low productivity in relation to precipitation but high production efficiency in relation to surface in the more arid lower elevations, vs. surface-abundant, with high productivity relative to precipitation based on high community surface area, but lower production efficiency in relation to this area in the more humid higher elevations. Vascular plant species diversity shows no simple relation to productivity, but decreases from high-elevation fir forests to the pine forests, increases from these to the open woodlands, and decreases from dry woodlands through the desert grassland and mountain slope desert to the lower bajada (creosotebush) desert. (auth)« less
  • Catchment characteristics determine the inputs of sediments and nutrients to streams. As a result, natural or anthropogenic disturbance of upland soil and vegetation can affect instream processes. The Fort Benning Military Installation (near Columbus, Georgia) exhibits a wide range of upland disturbance levels because of spatial variability in the intensity of military training. This gradient of disturbance was used to investigate the effect of upland soil and vegetation disturbance on rates of stream metabolism (ecosystem respiration rate [ER] and gross primary production rate [GPP]). Stream metabolism was measured using an open-system, single-station approach. All streams were net heterotrophic during allmore » seasons. ER was highest in winter and spring and lowest in summer and autumn. ER was negatively correlated with catchment disturbance level in winter, spring, and summer, but not in autumn. ER was positively correlated with abundance of coarse woody debris, but not significantly related to % benthic organic matter. GPP was low in all streams and generally not significantly correlated with disturbance level. Our results suggest that the generally intact riparian zones of these streams were not sufficient to protect them from the effect of upland disturbance, and they emphasize the role of the entire catchment in determining stream structure and function.« less
  • Understanding methane emissions from the Arctic, a fast-warming carbon reservoir, is important for projecting future changes in the global methane cycle. Here we optimized methane emissions from north of 60° N (pan-Arctic) regions using a nested-grid high-resolution inverse model that assimilates both high-precision surface measurements and column-average SCanning Imaging Absorption spectroMeter for Atmospheric CHartogrphY (SCIAMACHY) satellite retrievals of methane mole fraction. For the first time, methane emissions from lakes were integrated into an atmospheric transport and inversion estimate, together with prior wetland emissions estimated with six biogeochemical models. In our estimates, in 2005, global methane emissions were in the range ofmore » 496.4–511.5 Tg yr −1, and pan-Arctic methane emissions were in the range of 11.9–28.5 Tg yr −1. Methane emissions from pan-Arctic wetlands and lakes were 5.5–14.2 and 2.4–14.2 Tg yr −1, respectively. Methane emissions from Siberian wetlands and lakes are the largest and also have the largest uncertainty. Our results indicate that the uncertainty introduced by different wetland models could be much larger than the uncertainty of each inversion. We also show that assimilating satellite retrievals can reduce the uncertainty of the nested-grid inversions. The significance of lake emissions cannot be identified across the pan-Arctic by high-resolution inversions, but it is possible to identify high lake emissions from some specific regions. In contrast to global inversions, high-resolution nested-grid inversions perform better in estimating near-surface methane concentrations.« less