| 梁东丽,方日尧,李生秀,Ove Emteryd,张兴昌.硝、铵态氮肥对旱地土壤氧化亚氮排放的影响[J].干旱地区农业研究,2007,(1):67~72 |
| 硝、铵态氮肥对旱地土壤氧化亚氮排放的影响 |
| Effects of nitrogen types on N2O emissions of dry-land soil |
| |
| DOI：10.7606/j.issn.1000-7601.2007.01.14 |
| 中文关键词: 铵态氮肥 硝态氮肥 N2O排放 田间持水量 硝化作用 反硝化作用 |
| 英文关键词:N2O flux NO-3-N NH+4-N water hold capacity(WHC) nitrification denitrification |
| 基金项目:国家自然科学基金重点项目(30230230)； 国家科技攻关项目(2002BA516A02)； 中瑞国际合作项目 |
|
| 摘要点击次数: 413 |
| 全文下载次数: 630 |
| 中文摘要: |
| 用静态箱法在田间研究了黄土性土壤不同水分条件下施用硝态氮肥和铵态氮肥后土壤N2O的排放特点,并对包括温度、pH、水分等因子的影响进行了探讨。结果表明:在水分含量为田间持水量的90%和70%的条件下,铵态氮肥处理土壤的平均N2O排放量分别为233.6±165.4μg/(m2·h)和166.4±153.3μg/(m2·h);而施用硝态氮肥时则仅为75±40.2μg/(m2·h)和49.27±17.0μg/(m2·h)。施肥后短期内,铵态氮肥排放的N2O量显著高于硝态氮肥处理,由此可说明黄土性土壤表层土壤N2O的主要来源是土壤氮的硝化过程。在自然矿化条件下黄土性土壤N2O的排放量约为17.0μg/(m2·h)。如果把两个水分处理相比较,土壤水分对铵态氮肥处理土壤N2O的排放影响不明显,而对施用硝态氮肥的土壤有明显影响,高水分处理更利于土壤反硝化作用的进行从而增加了土壤N2O的排放量。施用不同肥料种类在施肥后短期内影响土壤的pH值和有效NO-3-N、NH+4-N含量,而反过来土壤水分含量、土壤pH以及土壤温度均不同程度地影响着土壤N2O的产生和排放。 |
| 英文摘要: |
| Based on field experiment the effects of nitrogen fertilizer types on N2O emissions and influential factors were studied under two different soil water conditions on the loess soil.The results showed that at both 90% WHC and 70% WHC water content,the average N2O emissions on ammonium treated plots were 233.6±165.4 μg/(m2·h) and 166.4± 153.3 μg/(m2·h),whereas those on the nitrate treated plots were 75±40.2 μg/(m2·h) and 49.27±17.0 μg/(m2·h), respectively.In the short period of fertilization,N2O fluxes from the ammonium plots were higher than that form the nitrate plots.Therefore,the main N2O sources on the surface of loess soil were from nitrification.Under the natural mineralization,N2O flux was about 17.0 μg/(m2·h) on the tested soil.Soil water status had little influence on the N2O fluxes from ammonium plot,while it had a large effect on the nitrate plots under the experimental condition.Meanwhile,soil temperature,pH,soil water content had certain influences on N2O emissions. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| | |