Factors affecting variation in CH4 emission from paddy soils grown with different rice cultivars: A pot experiment
Factors affecting variation in CH4 emission from paddy soils grown with different rice cultivars: A pot experiment
复制标题
不同水稻品种水稻土CH4排放变化影响因素的盆栽试验
DOI：
10.1029/98jd01679
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发表时间：
1998
影响因子：
--
通讯作者：
M. Kimura
中科院分区：
文献类型：
--
作者：
A. Watanabe;M. Kimura
水稻生长通过提供根系分泌物和脱落组织等有机物质、向根际环境释放氧气以及通过通气组织将CH 4从根际转移到大气中，对稻田CH 4排放产生重要影响。在本盆栽试验中，从根中的水溶性有机物质的释放，在根中的空气空间，和CH 4氧化能力的根CH 4排放的品种间差异的影响进行了研究，使用3个粳稻型品种（诺林25，日本晴，和AOINOKAZE），这是不同的形态特性。从7月中旬（分蘖期）到9月上旬（抽穗期），各品种的CH 4排放速率不同，整个生育期CH 4排放总量以农林25最大，其次是日本晴和青冈风。8月份，北方25根系水溶性有机物释放速率最大。根中的气室也是农林25最大，青之风最小。8月根系CH 4稳定碳同位素比值（δ 13 C）比土壤高3-10‰。根系与土壤CH 4 δ 13 C值的差异以青野风最大，农林25最小。9月份，根系与土壤CH 4 δ 13 C值的差值变小（2-3‰）。这些研究结果表明，在根际CH 4氧化的比例是最大的品种，排放量最小的CH 4和比例变得越来越小，继续植物生长。
The growth of rice plants greatly influences CH4 emission from paddy fields through the supply of organic materials such as root exudates and sloughed tissues, the release of oxygen to the root environment, and the transfer of CH4 from the rhizosphere into the atmosphere through the aerenchyma. In the present pot experiments, the effects of the release of water-soluble organic substances from roots, the air space in roots, and the CH4-oxidizing capacity of roots on intervarietal differences in CH4 emission were examined using three Japonica type cultivars (Norin 25, Nipponbare, and Aoinokaze), which differ in morphological properties. The CH4 emission rates varied among the cultivars from mid-July (tillering stage) to the beginning of September (heading stage).Total CH4 emission throughout the rice growth period was largest for Norin 25, followed by Nipponbare, and Aoinokaze. In August, the rate of release of water-soluble organic substances from roots was largest for Norin 25. The air space in roots was also largest in Norin 25 and least in Aoinokaze. The stable carbon isotopic ratios (δ13C) of CH4 in roots were 3–10‰ higher than those in soil in August. The difference in δ13C values of CH4 between roots and soil was largest for Aoinokaze and smallest for Norin 25. In September, the difference in δ13C values of CH4 between roots and soil became small (2–3‰). These findings suggest that the proportion of CH4 oxidation in the rhizosphere was largest in the cultivar which emitted the smallest amount of CH4 and that the proportion became smaller with continued plant growth.
影响因子：
6.9
作者：
JACKSON, MB;FENNING, TM;JENKINS, W
通讯作者：
JENKINS, W