Atmospheric CO<SUB>2</SUB> Enrichment of Potato in the Subarctic: Root Distribution and Soil Biology
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概要
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The effect of increasing atmospheric CO<SUB>2</SUB> concentration on fine root distribution of potatoes and associated soil biology activity under subarctic conditions has not been studied. Potatoes (<I>Solanum tuberosum</I> L.) were grown in open top field chambers at three CO<SUB>2</SUB> concentrations [ambient (A) ; A+175μmol mol<SUP>-1</SUP> CO<SUB>2</SUB> (A+175) ; A+350 μmol mol<SUP>-1</SUP> CO<SUB>2</SUB> (A+350) ] and in ambient CO<SUB>2</SUB> plots with no chambers (ANC) on a Tanana silt loam (non-acid loamy, mixed Pergelic Cryaquept) at Fairbanks, AK in 1994. Soil cores to a depth of 60 cm were taken at 0, 19, and 38 cm perpendicular to row center; root variables were ascertained at four 15 cm depth increments. Soil cores to a depth of 15 cm were also collected to assess soil biology (dehydrogenase activity, nematodes, and soil microarthropods) . Elevated CO<SUB>2</SUB> did not enhance root densities (i.e., both length and mass) at any depth or row position; there was no significant CO<SUB>2</SUB>×depth, CO<SUB>2</SUB>×position, or CO<SUB>2</SUB>×depth×position interactions for measured root variables. Significant depth×position interactions were noted. In general, a higher proportion of the potato root system grew closer to the row center (root length and mass bases) most notably at the uppermost soil depths. Elevated CO<SUB>2</SUB> had no impact on the soil biology parameters evaluated in this study. Our field results suggest that increased atmospheric CO<SUB>2</SUB> concentration did not alter belowground responses in potato under subarctic conditions of Alaska.
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