Radiation use efficiency, N accumulation and biomass production of high-yielding rice in aerobic culture
Radiation use efficiency, N accumulation and biomass production of high-yielding rice in aerobic culture
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DOI：
10.1016/j.fcr.2010.02.006
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发表时间：
2010-05-08
影响因子：
5.8
通讯作者：
Kato, Yoichiro
中科院分区：
文献类型：
--
作者：
Katsura, Keisuke;Okami, Midori;Kato, Yoichiro
好氧栽培的理念是在保持灌溉水稻生态系统高生产力的同时节省水资源。本研究比较了需氧和淹水培养中水稻作物生物量生产中的氮 (N) 积累和辐射利用效率 (RUE)。 2007年和2008年，好氧栽培和淹水栽培的总供水量分别为800-1300 mm和1500-3500 mm，并于2007年和2008年在日本东京和大阪两个地点高施氮量（180 kg N ha(-1)）种植了4个高产水稻品种。好氧栽培的地上部生物量和成熟期氮素积累量显着较高(分别为17.2-18.5 t ha(-1)和194-233 kg N ha(-1))高于淹水培养(14.7-15.8 t ha(-1)和142-173 kg N ha(-1))，但2007年东京除外，该地区表层土壤含水量经常下降。好氧培养中作物的氮吸收量高于淹水培养，因为好氧培养在繁殖阶段的氮积累率较高。需氧培养中的RUE与淹没培养中的RUE相当或更高（1.27-1.50 g MJ(-1) vs. 1.20-1.37 g MJ(-1)），除了2007年的东京（1.30 g MJ(-1) vs. 1.37 g MJ(-1)）。这些结果表明，需氧培养中较高的生物量产量可归因于更多的氮积累，从而导致比淹水培养中更高的氮浓度（N%）。品种对水分状况的差异被认为主要反映了以下方面的差异：(1) 需氧培养中土壤湿度暂时下降时的早期活力和 RUE 以及 (2) 淹水培养中保持高 N% 的能力。 (C) 2010 Elsevier B.V. 保留所有权利。
The concept of aerobic culture is to save water resource while maintaining high productivity in irrigated rice ecosystem. This study compared nitrogen (N) accumulation and radiation use efficiency (RUE) in the biomass production of rice crops in aerobic and flooded cultures. The total water input was 800-1300 mm and 1500-3500 mm in aerobic culture and flooded culture, respectively, and four high-yielding rice cultivars were grown with a high rate of N application (180 kg N ha(-1)) at two sites (Tokyo and Osaka) in Japan in 2007 and 2008. The aboveground biomass and N accumulation at maturity were significantly higher in aerobic culture (17.2-18.5 t ha(-1) and 194-233 kg N ha(-1), respectively) than in flooded culture (14.7-15.8 t ha(-1) and 142-173 kg N ha(-1)) except in Tokyo in 2007, where the surface soil moisture content frequently declined. The crop maintained higher N uptake in aerobic culture than in flooded culture, because in aerobic culture there was a higher N accumulation rate in the reproductive stage. RUE in aerobic culture was comparable to, or higher than, that in flooded culture (1.27-1.50 g MJ(-1) vs. 1.20-1.37 g MJ(-1)), except in Tokyo in 2007 (1.30 g MJ(-1) vs. 1.37 g MJ(-1)). These results suggest that higher biomass production in aerobic culture was attributable to greater N accumulation, leading to higher N concentration (N%) than in flooded culture. Cultivar differences in response to water regimes were thought to reflect differences in mainly (1) early vigor and RUE under temporary declines in soil moisture in aerobic culture and (2) the ability to maintain high N% in flooded culture. (C) 2010 Elsevier B.V. All rights reserved.