Distribution of bacterial and fungal populations between water-dispersed soil components and water-stable soil aggregates determined using the partial-sterilization and wash-sonic methods(Soil Biology)
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概要
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We investigated the effects of long-term cattle slurry application on soil aggregation and the distribution of microbial populations by characterizing soil structural properties, extraction patterns of chloroform-labile carbon over increasing periods of fumigation and microbial direct counts using the wash-sonic method in soil samples from an upland field with three levels of slurry application, 60, 150 and 300Mg ha^<-1>. The soil samples could be categorized based on the extraction patterns of chloroform-labile carbon. Soil from the 60Mg ha^<-1> plot released carbon at a constant rate under chloroform fumigation for 0.5 and 24h. The chloroform-labile carbon in the 300Mg ha^<-1> plot significantly increased over the same period, while that in the 150Mg ha^<-1> plot increased for 1h only. The bacterial count and the overall length of fungal hyphae were similar in the three plots. Indirect assessments of the relative abundance of bacterial and fungal populations using the wash-sonic method suggested that water-stable soil aggregates in the 300Mg ha^<-1> plot were stabilized by hyphae to a higher degree than aggregates from the 60 and the 150Mg ha^<-1> plots. The bulk densities significantly decreased and the maximum water-holding capacity significantly increased with the slurry application level. These observations confirm that slurry application enhances water-stable soil aggregation. A combined approach using the partial-sterilization and wash-sonic methods revealed that the relative dominance of fungal populations in the water-stable soil aggregates resulted in a higher amount of labile carbon in the time-dependent extraction by chloroform in the 300Mg ha^<-1> plot compared with the 60 and 150Mg ha^<-1> plots. The wash-sonic method has the potential to characterize microbial distribution between water-dispersed soil components and water-stable soil aggregates.
- 社団法人日本土壌肥料学会の論文
著者
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Hashimoto Tomoyoshi
National Agricultural Research Center for Kyushu Okinawa Region
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Kohno Nobuyuki
National Agricultural Research Center For Kyushu Okinawa Region:(present Office)institute For Enviro
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Hashimoto Tomoyoshi
National Agricultural Res. Center For Kyushu Okinawa Region Kumamoto
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