Biomass production by two-year-old poplar clones on floodplain sites in the Lower Midwest, USA |
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| Authors: | Stephen G Pallardy Daniel E Gibbins Julie L Rhoads |
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| Institution: | (1) Department of Forestry, University of Missouri, 203 Anheuser-Busch Hall, Columbia, MO 65211, USA |
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| Abstract: | Four Populus clones were grown for two years at 1×1 m spacing for study of total biomass production and carbon sequestration capacity
on floodplain sites previously in forage grasses under climatic conditions of the lower Midwest, U.S.A. Total biomass (above-and
below-ground) in the first year ranged from 3.9 Mg ha–1 in a Populus deltoides x P. nigra clone (I45/51) to 1.9 Mg ha–1 for a local-source Populus deltoides clone (2059). Second year total biomass production was substantially higher, ranging from 13.9 Mg ha–1 in I45/51 to 7.4 Mg ha–1 in P. deltoides clone 26C6R51. Second-year leaf area index (LAI) values for I45/51 plants reached 4 during mid-season, indicating essentially
complete canopy closure in this clone by the second year after planting. In contrast, maximum mid-season, second-year LAI
was significantly lower in P. deltoides clones ( 2.4). There was some evidence for differential allocation to roots and shoots among Populus clones, with 26C6R51 showing relatively more allocation to root biomass than other clones. Second-year growth in Populus deltoides clone 2059 accelerated substantially, and this genotype exhibited two-year biomass accumulation nearly equal to that of I45/51
despite having less leaf area. This result suggested a higher photosynthetic capacity or assimilation efficiency in the former.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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| Keywords: | Biomass production Carbon sequestration Leaf area index Populus Short-rotation intensive culture |
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