Plant biomass and species composition along an environmental gradient in montane riparian meadows |
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| Authors: | Email author" target="_blank">Kathleen?A?DwireEmail author J?Boone?Kauffman E?N?Jack?Brookshire John?E?Baham |
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| Institution: | (1) Department of Fisheries and Wildlife, Oregon State University, Corvallis, OR 97331–3803, USA;(2) Rocky Mountain Research Station, U.S.D.A. Forest Service, 222 South 22nd Street, Laramie, WY 82070, USA;(3) Institute of Pacific Islands Forestry, Pacific Southwest Research Station, 1151 Punchbowl Street, Suite 320, Honolulu, HI 96813, USA;(4) Department of Biology, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061–0406, USA;(5) Department of Crop and Soil Science, Oregon State University, Corvallis, OR 97331–3803, USA |
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| Abstract: | 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 (4,311±289 g/m2), intermediate biomass (2,236±221 g/m2) was seen in the moist meadow communities, dominated by grasses and sedges, and lowest biomass (1,403±113 g/m2) 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.Electronic Supplementary Material Supplementary material is available in the online version of this article at |
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| Keywords: | Aboveground biomass Belowground biomass Species richness Water table depth Soil redox potential |
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