成都平原稻田甲烷排放的实验研究
Methane Emissions from Rice Fields in the Chengdu Plain of China
查看参考文献9篇
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文摘
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根据1996～1999年四个稻季的观测资料，分析了成都平原单季稻甲边远排放的季节变化和年际变化特征。结果表明：在水稻生长季节甲烷排放通量变化很大，在分蘖期和成熟期一般会出现峰值。年际间的通量变化也很大，其年均排放通量的变化范围在2.35～33.95 mg m~(-2)h~(-1)之间。4年的平均排放通量为12 mg m~(-2)h~(-1)，与四川乐山的7年平均值30 mg m~(-2)h~(-1)相比，存在着明显的地区差异。同时分析讨论了温度、施肥、水稻品种、土壤氧化还原电位（Eh）以及稻田水位等诸多因素对稻田甲烷排放的影响。结果表明：在成都平原水稻生长季节的平均气温对CH_4的平均排放通量影响不大；而气温对CH_4排放的日变化有相对重要的影响，但气温对甲烷排放日变化的影响与水稻植物体的生长阶段有关；发现了水稻植物体（根、茎、叶）重量对CH_4排放的重要作用。讨论了合理使用肥料和施肥量，控制水位和Eh值对稻田CH_4的减排作用，提出优化组合诸影响因子，以充分发挥其减排潜力。 |
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其他语种文摘
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According to the measured data of four rice seasons between 1996 and 1999, characteristics of seasonal variation and annual variation of methane emission are analyzed for single-season rice in the Chengdu Plain. The results show a great variation in methane emission during the rice growing season, and the peak values appear during tillering period and fruiting period. A great inter-annual change is also observed and ranged from 2.35 mg m~(-2)h~(-1) to 33.95 mg m~(-2)h~(-1). The averaged value of CH_4 emission for the four years is 12 mg m~(-2)h~(-1). Compared with 30 mg m~(-2)h~(-1) for the 7-year average of Leshan in Sichuan Province, there is an apparent regional difference. Methane emission from rice field is affected by several factors including temperature, fertilization, rice variety, soil oxidation-reduction potential and water depth of rice field and so on. Results show that the average temperature during rice growing season in the Chengdu Plain has a little influence on annual CH_4 emission. However, during the early growing season, the temperature has a relatively significant influence on daily variation of CH_4 emission from rice field. Another finding is that the weights of root, stalk and leaf of rice plant body have a significant influence on CH_4 emission. An optimum combination of many effective factors is proposed in order to develop its potential of reducing CH_4 emission. |
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来源
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大气科学
,2002,26(6):731-743 【核心库】
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关键词
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稻田
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甲烷
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季节变化
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年际变化
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地址
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1.
中国科学院大气物理研究所, 北京, 100029
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中国科学院成都山地灾害和环境研究所, 成都, 610064
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Department of Physics, Portland State University, P.O. Box 751 Portland, 美国, Oregon
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Department of Environmental Science and Engineering, Oregon Graduate Institute, P.O. Box 91000 Portland, 美国, Oregon
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1006-9895 |
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学科
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大气科学(气象学) |
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基金
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中国科学院与美国能源部的联合研究项目
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文献收藏号
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CSCD:1006087
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