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- W2364952379 abstract "A pot experiment, with winter wheat(Trticum aestivums L.)and 13C pulse labeling technique, was conducted to quantify the distribution and net translocation of the assimilated C from plants to soil, and investigate the effect of nitrogen(N)supply on rhizodeposition. Three levels of N fertilizer were prepared:0(no nitrogen), 150(low nitrogen)and 300 mg N·kg-1(high nitrogen), and four growth stages of wheat plant were chosen for pulse-labeling with exposure to 13CO2 in 6-hour for each. Prior to labeling, the soil was isolated from shoot by a PVC sheet. Destructive samplings were applied right after labeling and at the end of the growing season. The results indicated 13C distribution in shoots decreased from 36.8%~94.1% for the net assimilation at the seeding stage of winter wheat to 39.9%~98.3% for that at the grain filling stage of wheat and was lower in no nitrogen treatment than nitrogen applied. In other side, the proportion of 0.3%~30% retained in roots was higher at the low nitrogen rate than that at the higher one. The net assimilated C incorporated into soil was lower than 1%, with the maximum value 2.4%. Over the growing season, the estimated net plant C input into soil was 51.4 mg C·plant-1 for low nitrogen treatment and significantly higher than 36 mg C·plant-1 for no nitrogen and 34 mg C·plant-1 for high nitrogen treatment. Based on total weight of root biomass at the harvest, winter wheat plant accumulated 102 mg C·plant-1, 105 mg C·plant-1 and 66 mg C·plant-1 in root residues which were retained in soil after harvest for no nitrogen, lower nitrogen and high nitrogen treatments respectively. Therefore, total of carbon input to soil were 138 mg C·plant-1, 156 mg C·plant-1 and 100 mg C·plant-1 after a growing season of plants for no, low and high nitrogen supply respectively. Our results demonstrated that in a pot experiment, low nitrogen application could significantly increase the accumulative net C input from root to soil." @default.
- W2364952379 created "2016-06-24" @default.
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- W2364952379 date "2008-01-01" @default.
- W2364952379 modified "2023-09-26" @default.
- W2364952379 title "Distribution and Translocation of Assimilated C Pulse-Labeled with ~(13)C for Winter Wheat(Trticum aestivums L.), as Affected by Nitrogen Supply" @default.
- W2364952379 hasPublicationYear "2008" @default.
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