| 种植密度和降水对冬小麦田N2O排放的影响 |
| 摘要点击 3141 全文点击 1728 投稿时间：2001-02-12 |
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| 中文关键词 N2O排放 麦田 种植密度 降水 |
| 英文关键词 N 2O emission winter wheat field planting density precipitation |
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| 中文摘要 |
| 为研究种植密度对农田N2O排放的影响和探讨N2O排放季节性波动的原因,于1999～2000年小麦生长季在南京市郊江宁县进行了不同播种量(0、90、180和270kg/hm2)的大田试验.观测分析结果表明:在相同的气象条件和田间管理下,播种～越冬阶段的N2O排放不受播种量的影响,返青～成熟阶段的N2O排放通量与播种量成正比.裸地条件下的N2O排放与播量为90kg/hm2下的排放无明显差异.造成该生长季内N2O排放季节性波动的主要原因是降水,返青～成熟阶段的N2O排放通量随观测日前6d的加权平均降水量呈指数增加.
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| 英文摘要 |
| To investigate the impact of plant density on N2O emission from winter wheat field and the cause of seasonal variation in the emission, field experiment with four planting rates of 0, 90, 180 and 270kg/ha was conducted at the Jiangning County near Nanjing during 1999～2000 winter wheat growing season. Data of the field measurements indicated that the N2O emission rates during the season from planting to overwintering were not influenced by the plant density, while the emission was positively correlated with the planting density during the season from turning green to maturity. The emissions from the field plots with planting rates of 0 and 90kg/ha were not found to be significantly different. A further analysis suggested that the seasonal variation of N2O emission be mainly influenced by precipitation, which could be quantitatively described by an exponential function of a weighted average precipitation of 6 day period before measurement. |
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