Production and nutrient dynamics in Carex wetlands

Bernard, John M.; Solander, Doris; Květ, Jan

doi:10.1016/0304-3770(88)90011-3

Cited by 62 publications

(32 citation statements)

References 48 publications

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“…Aboveground biomass values for the wet and moist meadows ( Table 2) are similar to values reported for other meadows (Manning et al 1989;Bernard 1990;Jakrlová 1993) and within the range (500-1,050 g/m 2 ) presented in a review of biomass distribution in temperate sedge-dominated wetlands (Bernard et al1988). Although our values for belowground biomass (Table 2) greatly exceeded the range (150-900 g/m 2 ) given by Bernard et al (1988), they are comparable to those presented for other riparian meadows dominated by similar graminoid species (Manning et al 1989;Fiala 1993;Otting 1998;Toledo and Kauffman 2001). Discrepancies among biomass values presented here and data reported in the literature may be largely due to ecological differences in study sites (e.g., differences in light and nutrient limitation), but they may also be influenced by differences in sampling and processing methods, annual variation (Jakrlová 1993;Thormann and Bailey 1997), seasonal variation (Aerts et al 1992), and presentation of results as air-dry mass, dry mass, and AFDM.…”

Section: Discussionmentioning

confidence: 62%

Plant biomass and species composition along an environmental gradient in montane riparian meadows

et al. 2004

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In riparian meadows, narrow zonation of the dominant vegetation frequently occurs along the elevational gradient from the stream edge to the floodplain terrace. We measured plant species composition and above- and belowground biomass in three riparian plant communities-a priori defined as wet, moist, and dry meadow-along short streamside topographic gradients in two montane meadows in northeast Oregon. The objectives were to: (1). compare above- and belowground biomass in the three meadow communities; (2). examine relations among plant species richness, biomass distribution, water table depth, and soil redox potential along the streamside elevational gradients. We installed wells and platinum electrodes along transects (perpendicular to the stream; n=5 per site) through the three plant communities, and monitored water table depth and soil redox potential (10 and 25 cm depth) from July 1997 to August 1999. Mean water table depth and soil redox potential differed significantly along the transects, and characterized a strong environmental gradient. Community differences in plant species composition were reflected in biomass distribution. Highest total biomass (live+dead) occurred in the sedge-dominated wet meadows (4311+/-289 g/m(2)), intermediate biomass (2236+/-221 g/m(2)) was seen in the moist meadow communities, dominated by grasses and sedges, and lowest biomass (1403+/-113 g/m(2)) was observed in the more diverse dry meadows, dominated by grasses and forbs. In the wet and moist communities, belowground biomass (live+dead) comprised 68-81% of the totals. Rhizome-to-root ratios and distinctive vertical profiles of belowground biomass reflected characteristics of the dominant graminoid species within each community. Total biomass was positively correlated with mean water table depth, and negatively correlated with mean redox potential (10 cm and 25 cm depths; P <0.01) and species richness ( P <0.05), indicating that the distribution of biomass coincided with the streamside edaphic gradient in these riparian meadows.

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Section: Discussionmentioning

confidence: 62%

Plant biomass and species composition along an environmental gradient in montane riparian meadows

et al. 2004

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“…) was higher than that observed in the present study (decreasing from 1 .1 up to 0 .6%) while phosphorus was similar (decreasing from 0 .15 up to 0.04%) . The inverse relationship between the nitrogen and phosphorus content of plants and their biomass have been reported before (Buresh et al ., 1980 ;Bernard et al ., 1988) and was explained as the result of dilution of nutrients because of faster carbon assimilation during the growing season . Coincidence between the maxima of nutrient standing stock and maxima of biomass is also well known (Buresh et al ., 1980 ;Bernard et al ., 1988) .…”

Section: Discussionmentioning

confidence: 99%

Macrophytic primary production and nutrient concentrations in a deltaic floodplain marsh of the Lower Paraná River

Villar¹,

Cabot

Bonetto

1996

Hydrobiologia

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Biomass changes across an annual cycle were followed at two sampling sites in the floodplain marsh of the Lower Parana River: close to the river-shore and 800 m inside the floodplain marsh, both dominated by Scirpus californicus and Cyperus giganteus . Tidal influence determines a daily exchange of water between the river and the floodplain marsh .Estimated net primary production was higher in the river (2820 against 1770 g m-2 ) . Contents of nitrogen and phosphorus in plant tissue decreased from the river to the floodplain (0 .62 to 0 .45% N and 0 .18 to 0 .14% P) . In spite of the important water exchange between the river and the floodplain, a decrease in nitrate, oxygen and suspended matter, and an increase in soluble reactive phosphorus in the water were observed from the river towards the floodplain marsh .A primary production gradient exists from the river to the inner floodplain marsh, where production is nitrogenlimited, sustained mainly on nutrients supplied by the river . Floodplain marshes are nitrate sinks, probably through denitrification losses and macrophyte uptake .

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“…Continuous seasonal development for each vascular plant group was obtained by fitting a log-linear function between the leaf area and day number. A four-parameter model form, which includes a constant, was used for the plant groups that have some overwintering parts (Karlsson 1985;Bernard et al 1988). For the rest of the plant groups, which senesce in winter (forbs and deciduous shrubs), we used a threeparameter form that estimates leaf area to be zero at the beginning of the year.…”

Section: Vegetation Measurementsmentioning

confidence: 99%

Methane flux dynamics during mire succession

Leppälä

Oksanen

Tuittila³

2010

Oecologia

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Vegetation, temperature and hydrology are major factors controlling wetland methane (CH(4)) dynamics. In order to test their importance, we measured CH(4) emissions and environmental characteristics over 2 years from five mires representing a successional sequence, ranging in age from 178 to 2,520 years. We hypothesized CH(4) emissions to be higher from the sedge-dominated fens than from the older bog stage. The more constant hydrological conditions at later successional stages as a consequence of the thicker peat layer appeared to result in lower temporal variation in CH(4) emissions. Accordingly, the other controls, temperature and vegetation, had an effect on CH(4) emissions only when the water table was sufficiently high. The seasonal variation in CH(4) emissions was controlled by temperature only at the oldest study site, which had the lowest variation in water table. Within-season variation in emissions related to plant phenology was highest at the fen stage, which was dominated by aerenchymatous plants with a strong seasonal pattern, namely sedges and forbs. In contrast to our hypothesis, CH(4) emissions increased with mire age towards the bog stage. However, the trend did not emerge during a rainy growing season, due to a rise in CH(4) emissions at the younger stages. The results may imply two different mechanisms during mire succession: while old mires are able to avoid the perturbation associated with variation in the water table and maintain their function as CH(4) emitters, young mires are exposed to perturbation but are able to recover their function.

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Production and nutrient dynamics in Carex wetlands

Cited by 62 publications

References 48 publications

Plant biomass and species composition along an environmental gradient in montane riparian meadows

Plant biomass and species composition along an environmental gradient in montane riparian meadows

Macrophytic primary production and nutrient concentrations in a deltaic floodplain marsh of the Lower Paraná River

Methane flux dynamics during mire succession

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