Quantification of the contrasting root systems of Pinus thunbergii in soils with different groundwater levels in a coastal forest in Japan
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The different root systems of Pinus thunbergii observed after the tsunami in 2011 were possibly influenced by different groundwater levels before the tsunami. The aims of this study were to quantify the tap and horizontal root structure and evaluate their relationship with the above-ground parts under different groundwater levels in a coastal P. thunbergii forest.
Two plots, sea- and land-side, with different groundwater levels, in a P. thunbergii stand, were established, and the entire root-systems of three select trees each were harvested to evaluate the biomass, lengths, and cross-sectional areas of the tap and horizontal roots.
In the sea-side plot, which had a shallower groundwater level, plate root systems with thicker and longer horizontal roots, but fewer tap roots were observed, whereas tap root systems were well developed in the land-side plots, where the groundwater level was deeper. The root-to- shoot ratio was significantly higher in the sea-side plot than in the land-side plot.
We confirmed that quantitative contrasting root systems of P. thunbergii develop under different groundwater levels and higher biomass allocation to horizontal roots occur under shallower groundwater depths, emphasizing the need for management practices that promote the development of tap root systems to enhance resistance to tsunamis.
KeywordsBiomass allocation Horizontal root Root-to-shoot ratio Plasticity Tap root Tsunami
Stem diameter at breast height
Stem height of lowest living branch
We thank K. Noguchi (Tohoku Research Center, FFPRI) for improving the manuscript, and K. Kujihashi, K. Okuda (University of Hyogo), J. An, R. Nakahata (Kyoto University), and S. Ohashi (Manbokuen), M. Harano (Aichi branch, Japan Tree Doctors Association) for their invaluable field and laboratory assistance, and A. Yoshikawa (Kyoto University) for the help with the photo analysis of root systems. We also thank A. Miyamoto, K. Hattori (Aichi Prefecture Fisheries Center), N. Yamashita, A. Ishida, A. Nakashima (Aichi Forestry Prefectural Center), the Aichi Prefecture Fisheries Center and Aichi Prefectural Government for permission to use the field site.
This study was partially funded by JSPS KAKENHI (Grant number, 25252027).
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflicts of interest.
- FAO-UNESCO (1990) Soil map of the world. Revised legend. Reprinted with corrections. World soil resources report 60. FAO, RomeGoogle Scholar
- Forestry Agency of Japan (2012) Annual Report on Forest and Forestry in Japan for FY2013. http://www.rinya.maff.go.jp/j/kikaku/hakusyo/23hakusyo/pdf/honbun1-3.pdf. Accessed 21 Nov 2017
- IPCC (2003) Good practice guidance for land use, land-use change and forestry. http://www.ipcc-nggip.iges.or.jp/public/gpglulucf/gpglulucf_files/GPG_LULUCF_FULL.pdf. Accessed 21 Nov 2017
- Japan Meteorological Agency (2017) http://www.data.jma.go.jp/obd/stats/etrn/. Accessed 31 Jan 2017
- Karizumi N (2010) The latest illustrations of tree roots (general remarks). Seibundoshinko-sya, Tokyo (in Japanese)Google Scholar
- Ministry of Environment Japan (2017) National green gas inventory report of Japan (2017). http://www-gio.nies.go.jp/aboutghg/nir/2017/NIR-JPN-2017-v3.1_web.pdf. Accessed 21 Nov 2017
- Miyata K, Kitahara H, Ono H (2013) Tree-pulling experiments of Pinus thunbergii forest along the seashore of Cape Irago, Aichi. Chubu. For Res 61:1–4 (in Japanese)Google Scholar
- Noguchi H, Suzuki S, Nanko K, Takeuchi Y, Kaneko T, Nitta K, Watanabe K, Sakamoto T (2014) Evaluation of lodging resistance characteristics of broad-leaved tree and Pinus thunbergii planted in coastal sand dunes using tree-pulling experiments. J Jpn Soc Coast For 13:59–66 (in Japanese with English summary)Google Scholar
- Oda T (2001) Study on the reaction of planted tree root systems to water-logging and its application to developing forests in damp lowlands of coastal sand dunes. Spec Bull Chiba Pref For Res Center 3:1–78 (in Japanese with English summary)Google Scholar
- Ohno R (2012) Report of field investigation. In: Research Institute of Forest Conservation and Management (ed) Report on research investigation of coastal forests and tsunami. Research Institute of Forest Conservation and Management. pp 71–92. http://www.hozen-ken.jp/menu/2012-01siryou5.pdf. Accessed 21 Nov 2017 (in Japanese)
- Polomski J, Kuhn N (1998) Wurzelsysteme. Birmensdorf, Eidgenössische Forschungsanstalt für Wald, Schnee und Landschaft. Bern, Stuttgart, Wien, HauptGoogle Scholar
- R Core Team (2017) R: a language and environment for statistical computing. R Foundation for Statistical Computing, Vienna, Austria. https://www.R-project.org/
- Sakamoto T (2012) Regeneration of coastal forests affected by tsunami. Forestry and Forest Products Research Institute, Japan, pp 1–24Google Scholar
- Sakamoto T, Noguchi H, Gotoh Y, Suzuki S, Shimada K (2013) Management of Japanese black pine (Pinus thunbergii) seedlings caused by natural regeneration. J Jpn Soc Coast For 12:29–34 (in Japanese with English summary)Google Scholar
- Tahara City (2015) Damage investigation for Nankai megathrust earthquake in Tahara city. 26 p. http://www.city.tahara.aichi.jp/_res/projects/default_project/_page_/001/001/437/mayor/newsconference/pdf/1506/1506_1-1nankaitorafu-higaisoutei.pdf. Accessed 27 Sep 2017