Examination of sampling method for earthworm community in agricultural land

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  • Kaneda Satoshi
    National Institute for Agro-Environmental Sciences
  • Nozaki Mana
    National Institute for Agro-Environmental Sciences:(Present office)National Research Institute of Fisheries and Environment of Inland Sea
  • Fujii Yoshikazu
    National Institute for Agro-Environmental Sciences:(Present office)University of Human Environments

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Other Title
  • 農耕地における効率的なミミズ採取法の検討
  • ノウコウチ ニ オケル コウリツテキ ナ ミミズ サイシュホウ ノ ケントウ

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Description

Sampling soil depth and sorting time were examined for effective investigation of earthworm community by hand sorting in agricultural land. Effective sampling soil depth and sorting time were determined by comparing the biomass and the species number which were established in from 10cm to 50cm soil depth, and in full time and time-limited sorting at volcanic and nonvolcanic-ash soil. Compared to 50cm depth sampling, 30cm depth sampling achieved mean recovery of over 90% of the biomass with 8 % decreasing mean species number. 6 minutes of sorting time was enough for extracting over 90% of mean earthworm biomass from a soil sample of 3.125L (25cm × 12.5cm × 10cm). Maximum individual earthworm biomass was decreasing with increasing sorting time. The earthworms which were found from the 3.125L soil samples after four minutes sampling were mainly immature, rotten, or pieces individuals, accounting for 92.6% of the numbers. It is concluded that sampling from 30cm depth and validated time-limited soil sorting is useful and time-saving approach for studies of earthworm community in agricultural land.

Journal

  • Edaphologia

    Edaphologia 90 (0), 25-30, 2012

    The Japanese Society of Soil Zoology

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