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Kadono, Atsunobu; Funakawa, Shinya*; Kosaki, Takashi*
no journal, ,
For better understanding of the terrestrial SOM dynamics and its modelling, following studies were conducted: (1) to determine the factors that affect the amounts of labile and recalcitrant SOM in different ecosystems, and (2) to offer a simple process-based model with measurable SOM pools that describe in situ SOM dynamics in natural grassland ecosystems. According to the relationship between potentially mineralizable C (PMC) and soil properties in forty-one surface soils collected in Ukraine and Kazakhstan, a SOM dynamics model was constructed using parameters including the PMC, net primary productivity (NPP) and soil respiration on a daily time. Measured soil respiration in Ukraine from 2002 to 2004 was well estimated by the SOM model. These results suggested that the proposed model successfully simulated the decomposition processes of PMC in natural grassland ecosystems.
Kawachi, Naoki; Fujimaki, Shu; Suzui, Nobuo; Ishii, Satomi; Ishioka, Noriko; Sekimoto, Hitoshi*
no journal, ,
no abstracts in English
Fujimaki, Shu; Suzui, Nobuo; Ishioka, Noriko; Kawachi, Naoki; Chino, Mitsuo*; Nakamura, Shinichi*
no journal, ,
Imaging of absorption, translocation and accumulation of cadmium in intact rice plants at the grain-filling stage was carried out using PETIS. A positron-emitting radioisotope Cd-107 (half-life: 6.5 h) was produced using a cyclotron, and fed to the root of the test plants with non-radioactive carrier. As a result, cadmium moved upwards with accumulating strongly in each node on the way to the ear. We concluded a model that cadmium absorbed by the root reaches the shoot base via the xylem within an hour, transfers from the xylem to the phloem at the nodes, and finally starts accumulation in the grains within 12 hours.
Suzui, Nobuo; Kawachi, Naoki; Ishii, Satomi; Nakamura, Shinichi*; Ishioka, Noriko; Fujimaki, Shu
no journal, ,
no abstracts in English
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) in an young rice plantYoneyama, Tadakatsu*; Suzui, Nobuo; Ishioka, Noriko; Fujimaki, Shu
no journal, ,
no abstracts in English
retrieving mechanisims at the shoot base of common reedMaruyama, Teppei*; Suzui, Nobuo; Kawachi, Naoki; Fujimaki, Shu; Tadano, Toshiaki*; Miwa, Eitaro*; Higuchi, Kyoko*
no journal, ,
no abstracts in English