In situ short-term carbon and nitrogen dynamics in relation to microbial dynamics after a simulated rainfall in croplands of different soil texture in Thailand(Soil Biology)
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概要
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The wetting-drying cycles of soil primarily drive carbon (C) and nitrogen (N) dynamics in tropical monsoon climates. We evaluated the in situ short-term C and N dynamics and the effect of soil texture during a wetting-drying cycle in relation to hourly microbial dynamics. Two croplands of differing soil textures (clay [THc] and sand [THs]) in Thailand were used for the experiment. Hourly measurements of soil CO_2 efflux and inorganic nitrogen (Inorg-N) were conducted and we determined fluctuations in the in situ microbial biomass (In-situ-MB) and in situ microbial activity (In-situ-qCO_2) after the application of a simulated rainfall (W plot) and a rainfall/glucose (WG plot) treatment. The rewetting of dry soil led to a C flush, which finished within 50-120h because of rapid soil drying at both sites. Comparing the microbial dynamics in the THc-W and THs-W plots, it is clear that the rainfall treatment predominantly increased In-situ-qCO_2 in the THc-W plot, whereas it increased In-situ-MB in the THs-W plot. These different microbial dynamics resulted in different C and N dynamics; that is, the cumulative soil CO_2 efflux for the first 100h after the treatment was effectively greater in the THs-W plot (3.4gCm^<-2>) than in the THc-W plot (2.8gCm^<-2>). In addition, distinct N-mineralization associated with a decreasing In-situ-MB was observed only in the THs-W plot, although this was not the case in the THc-W plot. Hence, we concluded that rainfall events should play a more important role in the C and N dynamics in sandy soils compared with clayey soils because of different microbial dynamics after rewetting of a dry soil.
著者
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KOSAKI Takashi
Graduate School of Urban Environmental Sciences Tokyo Metropolitan University
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FUNAKAWA Shinya
Graduate School of Agriculture, Kyoto University
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Kosaki Takashi
Department Of Tourism Science Tokyo Metropolitan University
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小 隆
京都大学大学院農学研究科
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Funakawa Shinya
Graduate School Of Agriculture Kyoto University
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Kosaki Takashi
Department Of Soil Sciences And Land Resource Faculty Of Agriculture Bogor Agricultural University
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Kosaki Takashi
Graduate School Of Agriculture Kyoto University
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Kosaki Takashi
Graduate School Of Urban Environmental Science Tokyo Metropolitan University
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SUGIHARA Soh
Graduate School of Agriculture, Kyoto University
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Sugihara Soh
Graduate School Of Agriculture Kyoto University
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Funakawa Shinya
Department Of Soil Sciences And Land Resource Faculty Of Agriculture Bogor Agricultural University
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Funakawa Shinya
Graduate School Of Global Environmental Studies Kyoto University:graduate School Of Agriculture Kyot
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