Effects of Successive Soil Freeze-Thaw Cycles on Soil Microbial Biomass and Organic Matter Decomposition Potential of Soils(Soil Biology)

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概要

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• Effects of soil freeze-thaw cycles on soil microbial biomass were examined using 8 soil samples collected from various locations, including 4 arable land sites and 2 forest sites in temperate regions and 2 arable land sites in tropical regions. The amounts of soil microbial biomass C and N, determined by the chloroform fumigation and extraction method, significantly decreased by 6 to 40% following four successive soil freeze-thaw cycles (-13 and 4℃ at 12 h-intervals) compared with the unfrozen control (kept at 4℃ during the same period of time as that of the freeze-thaw cycles). In other words, it was suggested that 60 to 94% of the soil microorganisms might survive following the successive freeze-thaw cycles. Canonical correlation analysis revealed a significantly positive correlation between the rate of microbial survival and organic matter content of soil (r = 0.948^*). Correlation analysis showed that the microbial survival rate was also positively correlated with the porespace whose size ranged from 9.5 to 6.0 μm (capillary-equivalent-diameter ; r = 0.995^<**>), pH(KCl) values (r = 0.925^<**>), EC values (r = 0.855^*), and pH(H_2O) values (r = 0.778^*), respectively. These results suggested that the soil physicochemical properties regulating the amount of unfrozen water in soil may affect the rate of microbial survival following the soil freeze-thaw cycles. The potential of organic matter decomposition of the soils was examined to estimate the effects of the soil freeze-thaw cycles on the soil processes associated with the soil microbial communities. The soil freeze-thaw cycles led to significant 6% increase in chitin decomposition and 7% decrease in rice straw decomposition (p < 0.05), suggesting that the partial sterilization associated with the soil freeze-thaw cycles might disturb the soil microbial functions.

• 社団法人日本土壌肥料学会の論文

著者

• Toyota K

  Nagoya Univ. Nagoya Jpn

• Toyota K

  Graduate School Ofbio-applications And Systems Engineering Tokyo University Of Agriculture And Techn

• Toyota Koki

  Laboratory Of Soil Biology And Chemistry School Of Agricultural Sciences Nagoya University

• Toyota Koki

  Graduate School Of Bioagricultural Sciences Nagoya University

• Yanai Yosuke

  Graduate School Of Bio-applications And Systems Engineering Tokyo University Of Agriculture And Tech

• Yanai Yosuke

  Department of Environment-Symbiotic Production Systems, Graduate School of Bio-Applications and Syst

• Toyota Koki

  Department of Environment-Symbiotic Production Systems, Graduate School of Bio-Applications and Syst

• Okazaki Masanori

  Department of Environment-Symbiotic Production Systems, Graduate School of Bio-Applications and Syst

• Okazaki M

  Institute Of Symbiotic Science And Technology Tokyo University Of Agriculture And Technology

• Toyota Koki

  Department Of Agricultural Chemistry Yezin Agricultural University

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