Relationships between Fungal Biomass and Nitrous Oxide Emission in Upland Rice Soils under No Tillage and Cover Cropping Systems

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概要

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• The relationships between soil microbial properties and nitrous oxide emission were examined in upland soil under different tillage systems [no tillage (NT), rotary and plow tillage] and cover crop systems (fallow, cereal rye, and hairy vetch)in 2004 and 2005. Microbiological analyses included the determination of soil ergosterol as an indicator of fungal biomass, bacterial plate counting, and MPN estimations of ammonia oxidizers and denitrifiers. The combined practice of NT with rye-cover crop treatment increased fungal biomass but not bacterial populations in 0-10cm deep soils. Such increase in fungal biomass was not found in 10-20cm and 20-30cm deep cover-cropped NT soil The combined practice of NT with rye-cover cropping resulted in higher in situ N_2O emission rates compared with rotary-and plowtill treatments. N_2O flux was positively correlated with soil ergosterol content but not with denitrifier MPN and other soil chemical properties. These results suggested a significant contribution of fungi to N_2O emission in cover-cropped NT soils.

• 日本微生物生態学会の論文

著者

• KOMATSUZAKI MASAKAZU

  Ibaraki University College of Agriculture

• OHTA HIROYUKI

  Ibaraki University College of Agriculture

• Ohta Hiroyuki

  Ibaraki Univ. Coll. Of Agriculture

• Sato Yoshinori

  Institute For Global Change Adaptation Science Ibaraki University

• Ohta Hiroyuki

  Ibaraki Univ.

• Sato Yoshinori

  Ibaraki Univ., Fac. of Agri.

• Ohta Hiroyuki

  College Of Agriculture Ibaraki University

• Sako Yoshihiko

  Laboratory Of Marine Microbiology Division Of Applied Biosciences Graduate School Of Agriculture Kyo

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