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黄土性土壤剖面中N2O排放的研究初报
引用本文:梁东丽,同延安,Ove Emterdy,李生秀,赵护兵,马林英.黄土性土壤剖面中N2O排放的研究初报[J].土壤学报,2002,39(6):802-809.
作者姓名:梁东丽  同延安  Ove Emterdy  李生秀  赵护兵  马林英
作者单位:1. 西北农林科技大学资环学院,陕西杨凌,712100
2. 瑞典农业大学森林生态系,瑞典宇默奥,90183
基金项目:中国瑞典国际合作项目,国家教委博士点基金项目,农业部重点科研计划项目 ( 95农 - 0 3- 0 1- 0 3)资助
摘    要:用田间原位土壤探头测定法和乙炔抑制未扰动土柱法 ,对黄土性土壤N2 O的排放进行了研究。试验结果表明 ,黄土性土壤N2 O的排放量存在着明显的季节和空间变异。季节变化与田间水分因子密切相关 ,N2 O高峰常出现在灌水 (降水 ) 3天后 ,施肥处理和对照的趋势完全一致。全年中八月份各土层N2 O浓度最高 ;在最高峰值时 ,施肥处理的N2 O浓度几乎是对照处理的 2 .5倍。土壤剖面中N2 O的浓度的顺序是 1 0cm <30cm <1 50cm <90cm <60cm ,以 60~90cm土层最高。影响黄土性土壤反硝化的主要因子是作为微生物能源和碳源的有机物质 ,在碳源充足时 ,土壤的硝态氮含量和水分因子是限制因子。

关 键 词:反硝化  硝化作用  N2O的排放  时间变异  空间变异
收稿时间:2000/12/25 0:00:00
修稿时间:2000年12月25

IN-SITU MEASUREMENT OF N2O EMISSIONS FROM PROFILE OF LOESS SOIL
Liang Dong-li,Tong Yan-an,Ove Emterdy,Li Sheng-xiu,Zhao Hu-bing and Ma Lin-ying.IN-SITU MEASUREMENT OF N2O EMISSIONS FROM PROFILE OF LOESS SOIL[J].Acta Pedologica Sinica,2002,39(6):802-809.
Authors:Liang Dong-li  Tong Yan-an  Ove Emterdy  Li Sheng-xiu  Zhao Hu-bing and Ma Lin-ying
Institution:Northwest Science & Technology University of Agriculture & Forestry, College of Resources & Environment Sciences, Shaanxi 712100;Northwest Science & Technology University of Agriculture & Forestry, College of Resources & Environment Sciences, Shaanxi 712100;Swedish University of Agricultural Sciences, Sweden, Umea 90183;Northwest Science & Technology University of Agriculture & Forestry, College of Resources & Environment Sciences, Shaanxi 712100;Northwest Science & Technology University of Agriculture & Forestry, College of Resources & Environment Sciences, Shaanxi 712100;Northwest Science & Technology University of Agriculture & Forestry, College of Resources & Environment Sciences, Shaanxi 712100
Abstract:Field soil bores measurement and static C 2H 2 inhibition soil cores method was used to study N 2O emission in the loess soil profile and the factors affecting its production. Significant spatial variation and temporal variation of the nitrous oxide amount were found in the soil used. The temporal variation was correlated with the water supply (such as rainfall or irrigation), and N 2O peaks were occurred 3 days after water events. Both the control and fertilized plots have the same trend. August was the highest N 2O production month during the period. At the highest point the N 2O concentration in the fertilized plot was 2.5 times higher than that in the control plot. Meanwhile N 2O spatial variation in the profile followed the order : 10cm<30cm<150cm<90cm<60cm. Carbon was the limited factor that controled denitrification in the soil. When carbon was supplied, nitrate content and water became the limited factors.
Keywords:Denitrification  Nitrification  N  2O flux  Temporal variation  Spatial variation
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