ススキ優占群落地上部の炭素と窒素の構成に及ぼす火入れと採草の影響

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The carbon and nitrogen (C-N) mass of each plant was measured in abandoned, harvested, burned, and burned-harvested plots in a Miscanthus sinensis Anderss.-dominated grassland for three years. In the abandoned plot, the C-N mass of M. sinensis plants decreased and that of woody plants increased each year, whereas the opposite occurred in the harvested plot. The C-N mass of M. sinensis plants increased rapidly after burning. The C-N ratio of M. sinensis plants was higher (mean=64) than that of other herbs and woody plants (means=35, 36, respectively). The C-N ratio of M. sinensis plants and other herbs was heigher in the burned and burned-harvested plots. The dominance of M. sinensis plants with a higher C-N ratio leads to an increase of the C-N ratio and lower nitrogen availability in the grassland plant community. Low nutrition conditions after burning may promote the dominance of M. sinensis over other plants.
2013-04-15