Variation in tree mortality, recruitment, and mean turnover rates between topographic positions in a temperate coniferous forest

DOI Web Site 39 References
  • Nakamori Yumiko
    Forestry Experimental Station, Wakayama Prefecture Research Center of Agriculture, Forestry and Fisheries
  • Torimaru Takeshi
    Faculty of Agriculture and Life Science, Hirosaki University
  • Hoshino Daisuke
    Tohoku Research Center, Forestry and Forest Products Research Institute
  • Yamamoto Shin-ichi
    Graduate School of Bioagricultural Sciences, Nagoya University
  • Nishimura Naoyuki
    Faculty of Environment and Information Management, Nagoya Sangyo University

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  • 温帯針葉樹林における地形に関係した樹木の死亡率,加入率,平均回転率

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Abstract

Forest community dynamics were investigated in relation to topography in two stands (Slope and Ridge stands) of an old-growth temperate mixed coniferous-broadleaved forest in the Sannoko Forest Reserve, south-western Japan. In 1985, all woody stems≧5cm diameter at breast height (DBH) in the plots were identified and marked; the census was repeated in 2002 and 2007. Over the census periods, mortality, recruitment, and mean turnover rates were higher in the Slope than the Ridge stand. The mortality rate in the understory layer was significantly higher in the Slope than the Ridge stand. Species' mean turnover rate was significantly negatively correlated with mean DBH in the Slope but not the Ridge stand. Among the dominant species over the whole period, in both stands, a significant number of conifers died but little recruitment occurred, while broadleaved species populations appeared to be maintained at dynamic equilibriums. Species that dominated the Ridge stand did not exhibit a dynamic equilibrium, unlike those that preferred the Slope stand. The fact that populations of coniferous and ridge-abundant species were not in equilibrium suggests that regeneration properties in the seedling stages, which are linked to specific and infrequent events such as landslide disturbance and/or canopy gap formation, may be important in the maintenance of the population of each species.

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