土壤学报2012，Vol.49Issue(2)：296-302,7.
冬季淹水稻田CH4排放通量及其δ13C的时间变化特征
TEMPORAL VARIATION OF CH4 FLUX AND ITS δ13C FROM WINTER FLOODED RICE FIELD
摘要
Abstract
Investigations were carried out of CH4 emission and its S C values from a rice field under continuous flooding throughout the fallow and following rice seasons. Results show that in the fallow season CH4 flux rose from April and reached a peak value, about 6.4 mg m~2 h"1 , in June. After rice transplanting, CH4 flux increased quickly at the beginning of the rice season and two peaks occurred in July and August, reaching 23. 1 and 29. 8 mg m h , respectively, which was followed by a rapid decrease. Then another peak appeared during the final drainage before rice harvest. The total CH4 emission in the fallow season amounted to 3.3 g m~2, accounting for 8.9% of the annual total emission. On the other hand, 8'3CH4 (emilled) increased gradually from -5\%c to -44%e, and then dropped back to - 56%e in the late fallow season. After rice transplanting, 8 C value decreased from - 62%e to -68%e firstly and then increased swiftly to -60%e, which afterwards remained unchanged for a relatively long time. Late in the season, emitted CH4 became C enriched again. The impact of the final drainage on 8 CH4 (eniilled) was remarkable. The 8 C value of emitted CH4 was heavier in the fallow season than in the rice season, because the fraction of CH4 oxidized was higher in the fallow season (60%~90% ) than during the following rice season (10%~80% ). Within the whole observation period, the temporal variation of CH4 flux was positively related to soil temperature (p <0.01) , but negatively related to soil Eh (p <0.01) and to 513C value (/><0.05) as well.关键词
CH4排放通量/CH4氧化率/稻田/稳定性碳同位素组成/时间变化Key words
CH4 flux/ Fraction of CH4 oxidized/ Rice field/ Isotopic composition/ Temporal variation分类
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张晓艳,张广斌,纪洋,马静,徐华,蔡祖聪..冬季淹水稻田CH4排放通量及其δ13C的时间变化特征[J].土壤学报,2012,49(2):296-302,7.基金项目
国家自然科学基金项目(40921061,41071169)、中国科学院战略性先导科技专项(XDA05020200)资助 （40921061,41071169）
