| 摘要: |
| 用乙炔抑制原状土柱法，就不同碳、氮质量分数对黄土性土壤水稻土和旱地农田土壤反硝化作用的影响进行了研究。结果表明，在适宜的氮质量分数和水分条件下，两种土壤的反硝化强度随碳质量分数的增大而增加，在有效碳源最高加入量200 mg/kg时达到最大；而在一定的碳质量分数和水分条件下，供试土壤的反硝化强度并不随土壤NO-3-N质量分数的增加而增加，在水稻土和农田土壤上最大反硝化作用的氮源加入量分别为300和150 mg/kg；当氮源为亚硝态氮时，两种土壤反硝化强度均随加入土壤亚硝态氮质量分数的增加而增加。 |
| 关键词: 黄土性土壤 反硝化作用 N2逸出 |
| DOI： |
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| 基金项目:中国瑞典国际合作项目，西北农林科技大学重点科研专项资助项目 |
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| Effects of available carbon and nitrogen concentration on the N2O flux of the Loessal soil |
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| Abstract: |
| By using C2H2 inhibition soil cores,these experiements studied the effects of available carbon and nitrogen concentration on the denitrification loss of normal grain field and peddy soil field of loessal soil.The results showed that:the denitrification loss increased with the available carbon concentration increased for both soils under the suitable nitrate nitrogen concentration and mositure content.Whereas the denitrificaion loss decreased with the NO-3-N concent reaching a certain level under the suitable available carbon and water content,the highest denitrification loss took place when available nitrogen content was N300 and N150 for the paddy soil and the dryland of grain field,respectively.However,when we used nitrate nitrogen as the nitrogen sources,the denitrification loss raised with the NO-2 concentration increased. |
| Key words: loess soil,denitrification,N 2O flux |
