Seasonal Change in Statistics for the Floristic Composition of Miscanthus- and Zoysia-dominated Grasslands

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  • Tomimatsu Hajime
    College of Science, Ibaraki University:National Institute of Livestock and Grassland Science
  • Itano Shiro
    National Institute of Livestock and Grassland Science
  • Tsutsumi Michio
    National Institute of Livestock and Grassland Science:(Present office)National Agricultural Research Center for Western Resion
  • Nakamura Toru
    Graduate School of Life and Environmental Sciences, University of Tsukuba
  • Maeda Satoko
    Graduate School of Life and Environmental Sciences, University of Tsukuba:(Present office)Ark Co, Ltd

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Other Title
  • ススキ(Miscanthus sinensis Anderss.)優占草地とシバ(Zoysia japonica Steud.)優占草地の植物種組成に関する統計量の季節変化
  • ススキ Miscanthus sinensis Anderss ユウセンソウチ ト シバ Zoysia japonica Steud ユウセンソウチ ノ ショクブツシュ ソセイ ニ カンスル トウケイリョウ ノ キセツ ヘンカ

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Abstract

In semi-natural grassland, the vegetation changes seasonally and annually. Therefore, to examine problems related to long-term vegetation change, we must understand the influence of study season on the vegetation diagnosis. This study investigated the phenological characteristics of Miscanthus (M)- and Zoysia (Z)-dominated grasslands. We established twenty 100×100cm quadrats in each grassland. In each quadrat, we identified all of the species, determined coverage and maximum height for each species, and vegetation cover and canopy height in spring, summer, and autumn. We calculated species diversity indices and vegetation similarity for each season. In both M- and Z-grasslands, the extended summed dominance ratios (E-SDR_2) of the dominant species changed seasonally. The number of species and vegetation height increased with the season in M-grassland, but not in Z-grassland. The vegetation similarity among seasons was lower in M-grassland. Therefore, the seasonal change in vegetation in M-grassland was greater than in Z-grassland. By contrast, the Shannon index (H') and Simpson index (D) differed little among seasons in each grassland, suggesting that the diversity index can be used to evaluate the grassland condition with long-term vegetation succession.

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