%0 Journal Article %1 citeulike:12890082 %A Hoque, Md %A Inubushi, Kazuyuki %A Miura, Shu %A Kobayashi, Kazuhiko %A Kim, Han-Yong %A Okada, Masumi %A Yabashi, Shingo %B Nutrient Cycling in Agroecosystems %D 2002 %I Kluwer Academic Publishers %K citeulikeExport face, face\_nutrients, fertilisation, nitrogen, rice, riceface, shizukuishi, soil %N 2-3 %P 301--308 %R 10.1023/a\%253a1021163111046 %T Nitrogen dynamics in paddy field as influenced by free-air CO2 enrichment (FACE) at three levels of nitrogen fertilization %U http://dx.doi.org/10.1023/a\%253a1021163111046 %V 63 %X As part of a FACE (free-air CO2 enrichment) experiment in a rice paddy field in Shizukuishi (Iwate Prefecture, Japan), studies were conducted to determine the effects of elevated CO2 on N dynamics at three levels of N application. Rice plants were grown under ambient CO2 or ambient + 200 ppmV CO2 conditions throughout the growing season in an Andosol soil with each treatment having 4 replicated plots. Three levels of N fertilizer (high, standard and low; 15, 9 and 4 gN m−2, respectively) were applied to examine different N availability under both CO2 conditions. Soil samples were collected at 4 different times from upper and lower soil layers (0–1 cm and 1–10 cm soil depths, respectively) and analyzed for microbial biomass N (BN), mineralizable N (Min. N) and NH4+-N in soil. Plant sampling was also done at 3 different times during the growing season to determine the N uptake by plant. Elevated CO2 significantly increased BN and Min. N in the upper soil layer at harvest by 25–42\% and 18–24\%, respectively, compared to ambient CO2, regardless of N application rate. In low N soil, these significant increases were also observed at the ripening stage. In addition, elevated CO2 only significantly increased the NH4+-N in the upper soil layer at harvest in low N soil compared to ambient CO2. The N uptake was not significantly affected by CO2 treatment. These results indicate that elevated CO2 had significant positive influence on BN and Min. N in the upper soil layer in paddy soil at the later period of the cropping season at all levels of N application rates, but only at low levels of application rate on NH4+-N.

@article{citeulike:12890082, abstract = {{As part of a FACE (free-air CO2 enrichment) experiment in a rice paddy field in Shizukuishi (Iwate Prefecture, Japan), studies were conducted to determine the effects of elevated CO2 on N dynamics at three levels of N application. Rice plants were grown under ambient CO2 or ambient + 200 ppmV CO2 conditions throughout the growing season in an Andosol soil with each treatment having 4 replicated plots. Three levels of N fertilizer (high, standard and low; 15, 9 and 4 gN m−2, respectively) were applied to examine different N availability under both CO2 conditions. Soil samples were collected at 4 different times from upper and lower soil layers (0–1 cm and 1–10 cm soil depths, respectively) and analyzed for microbial biomass N (BN), mineralizable N (Min. N) and NH4+-N in soil. Plant sampling was also done at 3 different times during the growing season to determine the N uptake by plant. Elevated CO2 significantly increased BN and Min. N in the upper soil layer at harvest by 25–42\% and 18–24\%, respectively, compared to ambient CO2, regardless of N application rate. In low N soil, these significant increases were also observed at the ripening stage. In addition, elevated CO2 only significantly increased the NH4+-N in the upper soil layer at harvest in low N soil compared to ambient CO2. The N uptake was not significantly affected by CO2 treatment. These results indicate that elevated CO2 had significant positive influence on BN and Min. N in the upper soil layer in paddy soil at the later period of the cropping season at all levels of N application rates, but only at low levels of application rate on NH4+-N.}}, added-at = {2019-03-31T01:14:40.000+0100}, author = {Hoque, Md and Inubushi, Kazuyuki and Miura, Shu and Kobayashi, Kazuhiko and Kim, Han-Yong and Okada, Masumi and Yabashi, Shingo}, biburl = {https://www.bibsonomy.org/bibtex/2ef5360cc50bb42c1305dfe6e41f424f0/dianella}, booktitle = {Nutrient Cycling in Agroecosystems}, citeulike-article-id = {12890082}, citeulike-linkout-0 = {http://dx.doi.org/10.1023/a\%253a1021163111046}, citeulike-linkout-1 = {http://link.springer.com/article/10.1023/A\%3A1021163111046}, doi = {10.1023/a\%253a1021163111046}, interhash = {90b7a474140717000f4422d6e33d295f}, intrahash = {ef5360cc50bb42c1305dfe6e41f424f0}, keywords = {citeulikeExport face, face\_nutrients, fertilisation, nitrogen, rice, riceface, shizukuishi, soil}, number = {2-3}, pages = {301--308}, posted-at = {2014-01-03 16:47:51}, priority = {2}, publisher = {Kluwer Academic Publishers}, timestamp = {2019-03-31T01:16:26.000+0100}, title = {{Nitrogen dynamics in paddy field as influenced by free-air CO2 enrichment (FACE) at three levels of nitrogen fertilization}}, url = {http://dx.doi.org/10.1023/a\%253a1021163111046}, volume = 63, year = 2002 }