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Infilling of Swamplands Behind Coastal Sand Dunes to Mitigate Coastal Disasters

  • Kenji Ono
  • Akihiro Imaya
  • Akane Komoriya
Chapter
Part of the International Perspectives in Geography book series (IPG)

Abstract

Japanese black pines in the coastal forests of Kujukuri and Futtsu-Misaki in the Chiba Prefecture have often withered under water-logged conditions due to impediment of gas exchange through tree roots. Such damp subsoil conditions could influence root development of planted seedlings. To successfully accomplish the reforestation of coastal forests, ensuring high disaster prevention, addition of soil to the lowlands is strongly recommended before planting seedlings. Taking into consideration the settlement of filled land, it is necessary to ensure that a minimum 180 cm-thick layer of fill materials is added. Common fill materials are composed of sandy soils excavated from adjacent hills, dredged soils from river mouths, and surplus soils generated from construction. In soil foundations constructed in this way, the root systems of planted trees are restricted to the shallow top layers. Few roots of 10-year-old trees are seen to extend more than 50 cm deep, likely due to the compactness of fill soils. Soil formation processes will also change with time. Thus, it is important to collect pedogenesis information in these coastal forests built on landfill for optimum success in reforestation efforts. Most of the soils in the land fill area of the Matsugaya coastal forest have high bulk density with low porosity and low water permeability. Sandy soil texture is uniformly distributed through the entire profile. Filamentous mottling occurs in all mineral soil horizons except for the top horizon, due to high humidity conditions in mineral soils. These soils are classified as Linic Spolic Technosol, mainly due to both the existence of the quite low permeability horizons and the high content of artefacts. Another research site, Shirako town, located along the Kujukuri forest having stand ages of 21–22 years, has been infilled using sandy soils containing buried rice straws at fixed depth and constant intervals. At the 21-year old forest stand site, deep tillage was carried out at constant intervals before planting. Soils are classified as Spolic Technosol. Relatively high permeability was achieved at both sites despite of their high bulk densities, and many roots were found to spread both horizontally and vertically.

Keywords

Land fill Soil compaction Tillage Water permeability Sandy soil materials 

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Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  1. 1.Tohoku Research CenterForestry and Forest Products Research InstituteMoriokaJapan
  2. 2.Japan International Research Center for Agricultural SciencesTsukubaJapan
  3. 3.Northern Forestry Administrative Office, the Department of Agriculture, Forestry and Fishery, Chiba Prefectural OfficeSanmuJapan

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