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with perovskite- and LiNbO-type structuresInaguma, Yoshiyuki*; Tanaka, Kie*; Tsuchiya, Takeshi*; Mori, Daisuke*; Katsumata, Tetsuhiro*; Oba, Tomonori*; Hiraki, Koichi*; Takahashi, Toshihiro*; Saito, Hiroyuki
Journal of the American Chemical Society, 133(42), p.16920 - 16929, 2011/09
Times Cited Count：84 Percentile：85.78(Chemistry, Multidisciplinary)Koarashi, Jun; Atarashi-Andoh, Mariko; Ishizuka, Shigehiro*; Miura, Satoru*; Saito, Takeshi*; Hirai, Keizo*
Global Change Biology, 15(3), p.631 - 642, 2009/03
Times Cited Count：44 Percentile：74.23(Biodiversity Conservation)Although it is well documented the possibility that global warming can lead to an acceleration of microbial decomposition of soil organic carbon (SOC), the magnitude and timing of this effect remains highly uncertain. The main reason is a lack of quantitative aspect of the heterogeneity in SOC biodegradability. To quantify the heterogeneity, we collected the soil and litter samples within a cool-temperate deciduous forest in Japan, separated chemically the samples into SOC fractions, determined their mean residence times (MRTs) based on the radiocarbon (
C) measurements, and finally represented the soil as a complex of six SOC pools with different range of MRTs. Predicted response of the SOC pools to warming demonstrates that the rate of SOC loss from the fast-cycling SOC pool diminishes quickly because of the substrate availability; in contrast, the warming continues to accelerate SOC loss from slow-cycling pools with MRTs of 20-200 year over the next century.
Atarashi-Andoh, Mariko; Koarashi, Jun; Ishizuka, Shigehiro*; Saito, Takeshi*; Hirai, Keizo*
JAEA-Conf 2008-003, p.75 - 78, 2008/04
C-14 is an effective tracer in investigating the carbon dynamics in the environment. In this study, the measurements of C-14 in soil organic matter (SOM) in a deciduous forest were used to determine the turnover time and CO
production rate from SOM. In addition, monthly measurements of carbon isotopic ratios in soil-respired CO and atmospheric CO were conducted to characterize the seasonal variation of the contribution of each CO source, such as SOM decomposition and root respiration.
Koarashi, Jun; Atarashi-Andoh, Mariko; Ishizuka, Shigehiro*; Saito, Takeshi*; Hirai, Keizo*; Miura, Satoru*
Proceedings of International Symposium on Application of a Closed Experimental System to Modeling of C Transfer in the Environment, p.72 - 76, 2008/00
Recent debate has emphasized that our capacity to predict the response of soil organic carbon (SOC) to climate change depends on a clear understanding of the heterogeneity in SOC biodegradability. We collected soil samples from the Appi forest meteorology research site dominated by Japanese beech, separated the soil samples into three SOC fractions with a chemical method, and determined their radiocarbon isotope ratios using an accelerator mass spectrometry. The radiocarbon signatures allow us to estimate their turnover times (TTs), quantifying the rates of SOC decomposition. According to the estimated TTs, the SOC was distinguished into six SOC pools with distinct TTs of several years to 
1000 years. The annual SOC decomposition rate was summed up to 0.47 kgC m
y
, about a half of which was from the fastest-cycling pool (litter). Approximately 5% of SOC gave the over-millennium TTs, suggesting that this pool plays a role of a long-term carbon sequestration in the carbon cycle.
Koarashi, Jun; Atarashi-Andoh, Mariko; Miura, Satoru*; Saito, Takeshi*; Ishizuka, Shigehiro*
no journal, ,
no abstracts in English
in beech forestAtarashi-Andoh, Mariko; Koarashi, Jun; Ishizuka, Shigehiro*; Saito, Takeshi*; Hirai, Keizo*
no journal, ,
Soil organic matter (SOM) is the major reservoir of carbon in terrestrial ecosystems. Thus, to evaluate the CO flux from SOM is an important step toward estimating the effect of environmental change on the terrestrial carbon cycles. In this study, we estimated the contribution of different soil CO sources (SOM, litter and root) to CO flux from the forest floor based on measures of carbon isotopic ratios in SOM, litter, soil-respired CO and atmospheric CO in a cool-temperate deciduous forest.
Koarashi, Jun; Atarashi-Andoh, Mariko; Ishizuka, Shigehiro*; Saito, Takeshi*; Hirai, Keizo*; Miura, Satoru*
no journal, ,
no abstracts in English
Hiraki, Yoshihisa; Saito, Toshimitsu*; Kakuda, Ayaka; Osugi, Takeshi; Sone, Tomoyuki; Kuroki, Ryoichiro; Kudo, Isamu*; Elakneswaran, Y.*; Sato, Tsutomu*
no journal, ,
no abstracts in English
Sato, Junya; Osone, Osamu*; Saito, Toshimitsu*; Irisawa, Keita; Osugi, Takeshi; Sone, Tomoyuki
no journal, ,
no abstracts in English
Hiraki, Yoshihisa; Kakuda, Ayaka; Saito, Toshimitsu*; Osugi, Takeshi; Sone, Tomoyuki; Kuroki, Ryoichiro; Elakneswaran, Y.*; Sato, Tsutomu*
no journal, ,
no abstracts in English
Sato, Junya; Takahashi, Yuta; Sunahara, Jun*; Saito, Toshimitsu*; Osugi, Takeshi
no journal, ,
no abstracts in English
Hiraki, Yoshihisa; Kakuda, Ayaka; Saito, Toshimitsu*; Sone, Tomoyuki; Elakneswaran, Y.*; Sato, Tsutomu*; Osugi, Takeshi; Kuroki, Ryoichiro
no journal, ,
no abstracts in English
Tabata, Koichi; Sato, Junya; Saito, Toshimitsu*; Sunahara, Jun*; Taniguchi, Takumi; Osugi, Takeshi
no journal, ,
no abstracts in English
