Changes of soil seed bank by seed density, number of taxa and composition for seven years

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  • YAMASE Keitaro
    Hyogo Prefectural Technology Center for Agriculture, Forestry and Fisheries
  • SEKIOKA Hiroaki
    Environmental Assessment Center Co. Ltd.
  • TODO Chikage
    Hyogo Prefectural Technology Center for Agriculture, Forestry and Fisheries

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  • 土壌シードバンクの種子密度と種数，種子組成の7 年間の変化
  • ドジョウ シードバンク ノ シュシ ミツド ト シュスウ,シュシ ソセイ ノ 7ネンカン ノ ヘンカ

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Abstract

In order to use for revegetation, we investigated the composition of soil seed bank both in 2005 and 2012. We collected 255 soil samples (20 cm × 20 cm × 5 cm in depth) from three districts in Hyogo prefecture, Japan. We counted emergent seedlings in the soil samples placed in an open space, and estimated the composition of soil seed bank. The environmental factors affecting the seed density and the number of taxa were analyzed using a generalized linear mixed model. The sampling year and the slope type were selected as variables for predicting the seed density. The seed density in 2005 was more on the valley slope> the straight slope> the ridge slope, but the seed density in 2012 was lower regardless of slope types. The composition of soil seed bank in 2012 against 2005 has significantly reduced in the ruderal species and the grassland species, but has almost unchanged in the coppice / summergreen species or the evergreen species. Changes of soil seed bank indicate that reestablishment of revegetation goal is necessary, assessment of soil seed bank potential is essential, and that control of surface erosion is required.

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