| 苗期玉米、大豆在土壤-植物系统N2O排放中的贡献 |
| 摘要点击 3012 全文点击 2094 投稿时间：2003-02-20 修订日期：2003-06-05 |
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| 中文关键词 N2O排放通量 玉米 大豆 土壤-植物系统 |
| 英文关键词 N2O emission maize soybean soil-plant system |
| 作者 | 单位 | | 李玥莹 | 中国科学院沈阳应用生态研究所陆地生态过程重点实验室,沈阳,110016 | | 陈冠雄 | 中国科学院沈阳应用生态研究所陆地生态过程重点实验室,沈阳,110016 | | 徐慧 | 中国科学院沈阳应用生态研究所陆地生态过程重点实验室,沈阳,110016 | | 张颖 | 中国科学院沈阳应用生态研究所陆地生态过程重点实验室,沈阳,110016 | | 张旭东 | 中国科学院沈阳应用生态研究所陆地生态过程重点实验室,沈阳,110016 |
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| 中文摘要 |
| 为区分植物在土壤-植物系统N2O排放中的贡献,用封闭式箱法对在温室内砂培和土培的玉米、大豆幼苗及砂、土、砂-植物系统、土壤-植物系统的N2O排放进行了测定,同时对植物N2O排放与植物叶片中的硝酸还原酶(NR)活性及NO3--N、NO2--N含量的关系进行了分析.结果表明:在53d的观测期内,玉米、大豆幼苗本身均可排放N2O,且在土壤(砂)-植物系统的N2O排放中占有很大份额(79.18%～100%);植物N2O的排放与植物叶片的硝酸还原酶活性和NO3--N、NO2--N的含量显著正相关(R2≥0.97,n=6). |
| 英文摘要 |
| To fractionate the contribution of plant to N2O emission from soil-plant system, the N2O emissions from soybean seedling, maize seedling, sand, soil, sand-plant system and soil-plant system were measured by closed chamber method in greenhouse. At the same time the correlation of plant N2O emission with nitrate reductase activity, nitrate content and nitrite content of the plant leaves was also analyzed. The results clearly indicated that N2O could be a by-product of plant metabolism. The emissions of N2O from maize and soybean accounted for 93%～100% of the total N2O emissions in the sand-plant systems, and 79.18%～92% in the soil-plant systems. The flux of plant N2O emission was significantly correlated(R2≥0.97,n=6) with the nitrate reductase activities, nitrate content and nitrite content of the maize and soybean leaves. |
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