Root system developments of <i>Pinus thunbergii</i> and broadleaf trees planted on anthropogenic growth bases with embankment in coastal forests -A case study in Komatsu, Sanmu City and Futtsu, Futtsu City, Chiba Prefecture, Japan-

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  • UGAWA Yuichi
    Forest Research Institute, Chiba Prefectural Agriculture and Forestry Research Center
  • KOMORIYA Akane
    Chiba Prefecture Chubu Forestry Administrative Office
  • OTA Takayuki
    Tohoku Research Center, Forestry and Forest Products Research Institute
  • ONO Kenji
    Tohoku Research Center, Forestry and Forest Products Research Institute
  • HAGINO Hiroaki
    Tohoku Research Center, Forestry and Forest Products Research Institute
  • NITTA Kyohei
    Akita Forestry Research and Training Center
  • NOGUCHI Hironori
    Department of Disaster Prevention, Meteorology and Hydrology, Forestry and Forest Products Research Institute

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Other Title
  • 海岸林の生育基盤盛土に植栽されたクロマツと広葉樹の根系発達 －千葉県山武市小松と富津市富津における調査結果の検討－
  • カイガンリン ノ セイイク キバン モリツチ ニ ショクサイサレタ クロマツ ト コウヨウジュ ノ コンケイ ハッタツ : チバケン サンムシ コマツ ト フッツシ フッツ ニ オケル チョウサ ケッカ ノ ケントウ

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Abstract

There are many low-lying lands with back swamps near the coastal areas of Kujukurihama and Cape Futtsu in Chiba Prefecture, Japan. Since the 1990’s, before afforestation of these areas occurred, growth bases with embankments were constructed to prevent planted tree roots from rotting due to waterlogged soil conditions. It was often observed, however, that the consolidated soil layers of growth bases built with heavy machinery suffered from obstructions to the deep development of their tree roots. In order to identify tree species whose roots can develop deep into the anthropogenic soil of these growth bases, we investigated the relationship between soil hardness and root development of Pinus thunbergii, which is the major tree species in the coastal forests of Japan, and some broadleaf tree species, which have the possibility to take on the role of P. thumbergii in case the species’ pine wilt disease spreads, at 2 sites of coastal forests (Futtsu and Komatsu site) in Chiba Prefecture. At the Futtsu site where ground water levels were about 0.8 m in depth, consolidated soil layers and groundwater levels seemed to behave as barriers against the vertical root developments of P. thunbergii and Machilus thunbergii. At the Komatsu sites where ground water level could not been observed, the consolidated soil pans were observed in shallow areas (about 30 cm deep) of the growth bases. Irrespective of species, many thin roots (< 1.0 cm in diameter) of the planted trees were observed to develop to the deep layer under the consolidated pans. The findings of this study suggest that some broadleaf species, including M. thunbergii, could be introduced to the moderately softened, anthoropogenic soils of the growth bases with embankment in inland coastal forests, as well as P. thunbergii.

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