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| 川中丘陵区冬灌田甲烷和氧化亚氮排放研究 | |
| 引用本文： | 江长胜,王跃思,郑循华,李晶,黄耀,韩广轩,张中杰,朱波.川中丘陵区冬灌田甲烷和氧化亚氮排放研究[J].应用生态学报,2005,16(3):539-544. |
| 作者姓名： | 江长胜 王跃思 郑循华 李晶 黄耀 韩广轩 张中杰 朱波 |
| 作者单位： | 1. 中国科学院大气物理研究所,北京,100029;中国科学院研究生院,北京,100039 2. 中国科学院大气物理研究所,北京,100029 3. 中国科学院成都山地灾害与环境研究所,成都,610041 |
| 基金项目： | 中国科学院知识创新工程重大项目 (KZCX1 SW 0 1 0 1B)，国家自然科学基金资助项目 ( 4 0 331 0 1 4，40 1 75 0 30 ) . |
| 摘 要： | 采用静态暗箱/气相色谱法对川中丘陵区冬灌田CH4和N2O排放特征进行连续一年的田间原位测定.结果表明，种植水稻区(种植区)在水稻生长季平均CH4排放速率为22.76±2.76 mg·m-2·h-1，休闲期平均为1.43±0.20 mg·m-2·h-1，全年平均为9.64±1.17 mg·m-2·h-1;全年CH4排放主要集中在水稻生长季，其累计CH4排放量占全年总CH4排放量的91.2%未种植水稻区(对照区) 全年CH4平均排放速率为2.03±0.18 mg·m-2·h-1，水稻生长季CH4排放量占全年总排放量的86.2%.N2O的排放在稻田落干时呈现脉冲排放.在水稻生长季，对照区CH4和N2O的季节排放速率分别为4.53±0.38mg·m-2·h-1和32.01±5.02 μg·m-2·h-1，而种植区则分别为22.76±2.76 mg·m-2·h-1和73.04±5.03 μg·m-2·h-1，植株参与导致CH4和N2O排放速率分别增加302%和128%.CH4和N2O的排放随土水分条件的变化呈互为消长关系.在冬灌田中，即使考虑500年的时间尺度，全年N2O排放产生的全球增温潜势也只有CH4的7.9%，与CH4相比,冬灌田排放的N2O所产生的温室效应很小. |
| 关 键 词： | 冬灌田 CH_4 N_2O 排放速率 |
| 文章编号： | 1001-9332(2005)03-0539-06 |
| 收稿时间： | 2004-03-26 |
| 修稿时间： | 2004年3月26日 |
CH4 and N2O emission from a winter-time flooded paddy field in a hilly area of Southwest China |
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| JIANG Changsheng,WANG Yuesi,ZHENG Xunhua,LI Jing,HUANG Yao,HAN Guangxuan,ZHANG Zhongjie,ZHU Bo.CH4 and N2O emission from a winter-time flooded paddy field in a hilly area of Southwest China[J].Chinese Journal of Applied Ecology,2005,16(3):539-544. | |
| Authors: | JIANG Changsheng WANG Yuesi ZHENG Xunhua LI Jing HUANG Yao HAN Guangxuan ZHANG Zhongjie ZHU Bo |
| Affiliation: | Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China. jchshg@163.com |
| Abstract: | By the method of static opaque chamber/modified gas chromatography, a one-year field experiment was conducted to measure in situ the CH4 and N2O emission from a winter-time flooded paddy field in a hilly area of Southwest China. Gas samples were taken simultaneously from rice-involved and rice-uninvolved plots. The results showed that during rice growth period, the CH4 emission from the winter-time flooded paddy field was higher than that from other paddy fields, but largely lower than many previous reports for the similar regions in Southwest China. The average flux of CH4 emission from rice-involved plots was 22.76 +/- 2.76 mg CH4 x m(-2) x h(-1) during rice growth period, 9.64 +/- 1.17 mg CH4 x m(-2) x h(-1) per year, and 1.43 +/- 0.20 mg CH4 x m(-2) x h(-1) during non-rice growth season; while that from rice-uninvolved plots was only 2.03 +/- 0.18 mg CH4 x m(-2) x h(-1) per year, markedly lower than those from rice-involved plots. During rice growth season, the mean emission rate of CH4 and N2O was 4.53 +/- 0.38 mg CH4 x m(-2) x h(-1) and 32.01 +/- 5.02 microg N2O x m(-2) x h(-1) from rice-uninvolved plots, but reached to 22.76 +/- 2.76 mg CH4 x m(-2) x h(-1) and 73.04 +/- 5.03 microg N2O x m(-2) x h(-1) from rice-involved plots, respectively. Rice involvement resulted in 302% increment of CH4 and 128% increment of N2O emission. There was a clear trade-off between CH4 and N2O emission in paddy fields. Even with a span of 500 years, our calculation showed that in this winter-time flooded paddy field, the GWP contributed by N2O production was 7.9% of the CH4 contribution, and thus, the greenhouse effect of N2O production from this field was very small. |
| Keywords: | Winter-time flooded paddy field CH_4 and N_2O Emission rate |
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