| 贵州省旱田土壤N2O释放及其环境影响因素 |
| 摘要点击 3803 全文点击 3112 投稿时间：1999-09-26 |
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| 中文关键词 N2O 释放通量 旱田土壤 影响因素 |
| 英文关键词 N2O,flux, upland soils,controlling factors. |
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| 中文摘要 |
| 以贵州省的玉米－油菜轮作田、大豆－冬小麦轮作和休耕地为研究对象，采用密闭箱－气相色谱法，对整个轮作期的土壤Ｎ2Ｏ释放进行观测，初步研究我国亚热带旱田的Ｎ2Ｏ释放特征．实验研究结果表明，３试验田Ｎ2Ｏ释放通量具有相同的规律性日变化形式，秋收作物达通量极大值的时间比越冬作物滞后２ｈ～３ｈ，气温是控制Ｎ2Ｏ通量日变化的主要环境因子：３试验田Ｎ2Ｏ释放通量（以Ｎ2Ｏ中的Ｎ计）分别在９．８１～４３３．１１，４．００～１８０．４１和９．７４～２８２．００μｇ·ｍ-2·ｈ-1，高于我国水田和北方旱田的Ｎ2Ｏ释放通量；进一步分析表明，３试验田Ｎ2Ｏ释放通量具有相同的季节变化模式，Ｎ2Ｏ 释放峰受降雨事件的直接影响，Ｎ2Ｏ通量与降雨量和土壤湿度间有显著的正相关性，而与温度的关系不明显 |
| 英文摘要 |
| Three fields including a corn rape rotation field,a soybean winter wheat rotation field and a fallow land were chosen as study plots to measure N2O flux from soils using close chamber GC method during crop rotation,the purpose of this research was to study the characteristics of N2O flux.The results indicated the shapes of N2O diurnal variation were similar between above three fields,the time which N2O flux reached the highest was 2 or 3 hours later from corn and soybean fields than from rape and winter wheat fields,and air temperature was the key factor influencing the diurnal variation of N2O flux.The ranges of N2O flux(as N in N2O)from above three fields were 9.81～433.11,4.00～180.41 and 9.74～282.00μg·m-2 ·h-1 respectively,they were higher than fluxes from upland soils in North China.Furthermore,the seasonal variation characteristics of N2O flux from above three fields were homologous,N2O flux pulses were produced and driven by rainfall events directly,the relativity between N2O flux and precipitation and soil's moisture were positive remarkably,but the relativity was not important between N2O flux and temperature. |
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