Methane Fluxes from an Australian Floodplain Wetland: The Importance of Emergent Macrophytes

1995 ◽  
Vol 14 (4) ◽  
pp. 582-598 ◽  
Author(s):  
Paul I. Boon ◽  
Brian K. Sorrell
Keyword(s):  
Floodplain Wetland ◽  
Emergent Macrophytes ◽  
Methane Fluxes

Establishment of Three Emergent Macrophytes Under Different Water Regimes

1999 ◽  
Vol 40 (3) ◽  
pp. 233-240 ◽  
Author(s):  
S. G. T. Giovannini ◽  
D. M. L. da Motta Marques
Keyword(s):  
Water Level ◽  
Aquatic Macrophytes ◽  
Water Regime ◽  
Emergent Macrophytes ◽  
Morphological Response ◽  
Water Regimes ◽  
Wetland Construction ◽  
Scirpus Californicus ◽  
Level 3 ◽  
Plot Design

The behavior of three emergent aquatic macrophytes under different water regimes was studied with the aim of achieving reconvertion of degraded wetlands and wetland construction for water quality improvement. Scirpus californicus, Typha subulata and Zizaniopsis bonariensis establishment was evaluated under a split plot design, in a factorial experiment with three levels of a water regime factor over a subsoil substratum. The stagnant 10±2 cm water level was best suited to T. subulata and Z. bonariensis development and S. californicus developed better at oscillating water level (3±2 cm) with flooding at 48 hour intervals. The morphological response variables (thickness and width at half length of the tallest leaf or stem per plant, height of tallest leaf or stem per plant, number of green leaves or stems and number of shoots per plant, and survival of propagules' original leaves or stems) were satisfactory descriptors to differentiate (p<0.1%) growth of above ground parts as related to water regimes and species. The three species did survive satisfactory in subsoil-like substratum under the tested water regimes. Mortality was in the worse case, 17.2%, 36.7%, and 9.4% for S. californicus, T. subulata, and Z. bonariensis, respectively. Although Z. bonariensis growth was very poor, only S. californicus and T. subulata could be indicated for planting under similar limiting conditions.

Verifying Three Types of Methane Fluxes from Soils by Testing the Performance of a Novel Mobile Photoacoustic Method versus a Well-Established Gas Chromatographic One

2006 ◽  
Vol 40 (20) ◽  
pp. 6425-6431 ◽  
Author(s):  
Hermann F. Jungkunst ◽  
Raimund Sauter ◽  
Andreas Link ◽  
Sabine Fiedler ◽  
Karl Stahr ◽  
...  
Keyword(s):  
Photoacoustic Method ◽  
Methane Fluxes

scholarly journals Correction to “Spatial and temporal dynamics in eddy covariance observations of methane fluxes at a tundra site in northeastern Siberia”

2012 ◽  
Vol 117 (G1) ◽  
Author(s):  
F. J. W. Parmentier ◽  
J. van Huissteden ◽  
M. K. van der Molen ◽  
G. Schaepman-Strub ◽  
S. A. Karsanaev ◽  
...  
Keyword(s):  
Eddy Covariance ◽  
Temporal Dynamics ◽  
Northeastern Siberia ◽  
Spatial And Temporal Dynamics ◽  
Methane Fluxes

scholarly journals Nitrous oxide and methane fluxes from cattle excrement on C3 pasture and C4-dominated shortgrass steppe

2016 ◽  
Vol 225 ◽  
pp. 104-115 ◽  
Author(s):  
Kristopher L. Nichols ◽  
Stephen J. Del Grosso ◽  
Justin D. Derner ◽  
Ronald F. Follett ◽  
Shawn L. Archibeque ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Shortgrass Steppe ◽  
Methane Fluxes

scholarly journals The growing season greenhouse gas balance of a continental tundra site in the Indigirka lowlands, NE Siberia

2007 ◽  
Vol 4 (6) ◽  
pp. 985-1003 ◽  
Author(s):  
M. K. van der Molen ◽  
J. van Huissteden ◽  
F. J. W. Parmentier ◽  
A. M. R. Petrescu ◽  
A. J. Dolman ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Soil Temperature ◽  
Greenhouse Gas ◽  
Growing Season ◽  
Light Limitation ◽  
Greenhouse Gas Balance ◽  
Area Index ◽  
North East ◽  
Methane Fluxes ◽  
Gas Balance

Abstract. Carbon dioxide and methane fluxes were measured at a tundra site near Chokurdakh, in the lowlands of the Indigirka river in north-east Siberia. This site is one of the few stations on Russian tundra and it is different from most other tundra flux stations in its continentality. A suite of methods was applied to determine the fluxes of NEE, GPP, Reco and methane, including eddy covariance, chambers and leaf cuvettes. Net carbon dioxide fluxes were high compared with other tundra sites, with NEE=−92 g C m−2 yr−1, which is composed of an Reco=+141 g C m−2 yr−1 and GPP=−232 g C m−2 yr−1. This large carbon dioxide sink may be explained by the continental climate, that is reflected in low winter soil temperatures (−14°C), reducing the respiration rates, and short, relatively warm summers, stimulating high photosynthesis rates. Interannual variability in GPP was dominated by the frequency of light limitation (Rg<200 W m−2), whereas Reco depends most directly on soil temperature and time in the growing season, which serves as a proxy of the combined effects of active layer depth, leaf area index, soil moisture and substrate availability. The methane flux, in units of global warming potential, was +28 g C-CO2e m−2 yr−1, so that the greenhouse gas balance was −64 g C-CO2e m−2 yr−1. Methane fluxes depended only slightly on soil temperature and were highly sensitive to hydrological conditions and vegetation composition.

scholarly journals Methylocella Species Are Facultatively Methanotrophic

2005 ◽  
Vol 187 (13) ◽  
pp. 4665-4670 ◽  
Author(s):  
Svetlana N. Dedysh ◽  
Claudia Knief ◽  
Peter F. Dunfield
Keyword(s):  
Methane Oxidation ◽  
16S Rrna Genes ◽  
Rrna Genes ◽  
Methanotrophic Bacteria ◽  
Soluble Methane Monooxygenase ◽  
Cell Counts ◽  
Carbon Compounds ◽  
Methane Fluxes ◽  
The One ◽  
Pcr Targeting

ABSTRACT All aerobic methanotrophic bacteria described to date are unable to grow on substrates containing carbon-carbon bonds. Here we demonstrate that members of the recently discovered genus Methylocella are an exception to this. These bacteria are able to use as their sole energy source the one-carbon compounds methane and methanol, as well as the multicarbon compounds acetate, pyruvate, succinate, malate, and ethanol. To conclusively verify facultative growth, acetate and methane were used as model substrates in growth experiments with the type strain Methylocella silvestris BL2. Quantitative real-time PCR targeting the mmoX gene, which encodes a subunit of soluble methane monooxygenase, showed that copies of this gene increased in parallel with cell counts during growth on either acetate or methane as the sole substrate. This verified that cells possessing the genetic basis of methane oxidation grew on acetate as well as methane. Cloning of 16S rRNA genes and fluorescence in situ hybridization with strain-specific and genus-specific oligonucleotide probes detected no contaminants in cultures. The growth rate and carbon conversion efficiency were higher on acetate than on methane, and when both substrates were provided in excess, acetate was preferably used and methane oxidation was shut down. Our data demonstrate that not all methanotrophic bacteria are limited to growing on one-carbon compounds. This could have major implications for understanding the factors controlling methane fluxes in the environment.

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