Effects of Light Availability and Resource Subsidy on the Vegetative Spread of Phalaris Arundinacea L. (Reed Canarygrass) in Wetlands
Author: Debbie Maurer
Publisher:
Published: 2001
Total Pages: 0
ISBN-13:
DOWNLOAD EBOOKRead and Download eBook Full
Author: Debbie Maurer
Publisher:
Published: 2001
Total Pages: 0
ISBN-13:
DOWNLOAD EBOOKAuthor: Debbie Maurer
Publisher:
Published: 2001
Total Pages: 156
ISBN-13:
DOWNLOAD EBOOKAuthor: Julia C. Wilcox
Publisher:
Published: 2004
Total Pages: 146
ISBN-13:
DOWNLOAD EBOOKAuthor: Laura Goodman Perry
Publisher:
Published: 2001
Total Pages: 350
ISBN-13:
DOWNLOAD EBOOKAuthor: Michael T. Schwar
Publisher:
Published: 2002
Total Pages: 564
ISBN-13:
DOWNLOAD EBOOKAuthor: Jonathan S. Bills
Publisher:
Published: 2008
Total Pages: 198
ISBN-13:
DOWNLOAD EBOOKTerrestrial carbon sequestration is one of several proposed strategies to reduce the rate of carbon dioxide (CO2) accumulation in the atmosphere, but the impact of plant invasion on soil organic carbon (SOC) storage is unclear. The results of past studies are often confounded by differences in vegetation and environmental conditions. Reed canary grass (Phalaris arundinacea) is an herbaceous species that invades riparian fringes and wetlands throughout North America, including Beanblossom Bottoms - a wetland complex in south-central Indiana. Because of the prolific growth of P. arundinacea, it was hypothesized that significant alterations in SOC pools and dynamics would occur at invaded sites within the wetland complex. To test this hypothesis, study plots were established in areas colonized either by native herbaceous species or by P. arundinacea. Above and below-ground biomass were collected at the middle and end of the growing season and were analyzed for cellulose, lignin, acid detergent fiber, total phenolics, and organic carbon and nitrogen concentration. Soil samples were analyzed for SOC and nitrogen, bulk density, pH, and texture. The biomass of Scirpus cyperinus - a native wetland species was found to contain significantly (P
Author: Suzanne Marie Kercher
Publisher:
Published: 2003
Total Pages: 148
ISBN-13:
DOWNLOAD EBOOKAuthor: Andrea M. Herr-Turoff
Publisher:
Published: 2005
Total Pages: 144
ISBN-13:
DOWNLOAD EBOOKAuthor:
Publisher:
Published: 2018
Total Pages: 90
ISBN-13:
DOWNLOAD EBOOKWe sought to determine the effects of 13 years of hydrologic management on the wetland plant community in Smith and Bybee Wetlands Natural Area (SBW), an 809 ha palustrine wetland complex in north Portland, Oregon. Previous management efforts resulted in an altered hydrologic regime; historically high water levels in spring and low water levels in fall were replaced by persistent water levels with minimal annual variations. A water control structure was installed in 2003 to better approximate historic seasonal hydrologic changes to reduce invasive Phalaris arundinacea (reed canarygrass) cover and promote native wetland vegetation growth. Vegetation monitoring has been carried out in three phases since project initiation (2003-2004, 2008-2009, and 2015-2016) to assess restoration efforts. Using lineintercept and differential leveling methods, we measured 25 randomly established transects ranging from 21.5m to 280.7m (mean: 92.87m) during monitoring years for vegetation and elevation to determine changes in vegetation in relation to seasonally varying water levels. Overall, reed canarygrass percent cover has decreased from 46.5% in 2003 to 17.6% in 2016 across all transect elevations. Reed canarygrass has been replaced significantly by seven native plant species with ≥ 5% cover on site. Native Persicaria amphibia (smartweed) has replaced reed canarygrass as the dominant species on site, increasing in cover from 20.2% in 2003 to 67.9% in 2016. Smartweed also replaced all other common species on site except for Salix lucida lasiandra. Other common native species (Bidens cernua, Eragrostis hypnoides, Eleocharis palustris, and Cyperus sp.) experienced earlier declines in cover between 2003 and 2009, but have since increased in cover primarily in low transect elevations in relation to lower inundation rates during their early growing seasons. Species diversity has declined significantly since 2003. Diversity was inversly correlated with reed canarygrass presence in 2003. These findings demonstrate that hydrologic management of a wetland system can be effective at reducing the presence of reed canarygrass and increasing native wetland vegetation by recreating historic hydrologic conditions that include increased inundation during the early growing season of reed canarygrass. Initial long inundation periods were most effective at reducing reed canarygrass, but did not need to be maintained indefinitely. Shortening and varying the inundation periods in later years after reed canarygrass has been reduced can be effective at maintaining lower levels of reed canarygrass while simultaneously increasing native species cover.
Author: Satomi Inahara
Publisher:
Published: 2002
Total Pages: 128
ISBN-13:
DOWNLOAD EBOOKThe West Eugene Wetlands, Eugene, Oregon, which provide habitat for number of endemic and endangered plant species, are currently threatened by a Reed canarygrass (Phalaris arundinacea L.) invasion. This study addresses the hypothesis that Phalaris spread can be explained in part by using watershed-scale landuse patterns as surrogates of the water quality and hydrologic regime in the associated watersheds. A multiple regression model was constructed to test the effects of watershed-scale landuses on Phalaris abundance. The spatially referenced landuse attributes were estimated using accumulated inverse-squared flow path distances between each wetland and cells in a grid-based representation of landuse/cover data in a Geographic Information System. The locally measured physical and biological characteristics of wetlands were also incorporated into the model to adjust for site differences. Bias in the estimated parametric coefficients were found to be negligible using 1,000 iterations of a bootstrap re-sampling technique. Bias-corrected-and-accelerated intervals also supported the significance of these estimates. The inferential model, consisting of the percentage open water cover in the wetlands, an indicator of highly disturbed site and watershed-scale urban and forest landuses, explained 67 percent variation of Phalaris abundance. There was convincing evidence that the cumulative watershed-scale landuse patterns affected Phalaris abundance (p-value