| 摘要: |
| 以年降雨量632 mm的黄土高原南部旱地小麦田及休耕地为研究对象，研究了耕作措施及氮肥施用对小麦生长期土壤N2O排放及土壤脲酶活性的影响。结果表明，种植小麦对农田N2O排放及10～20 cm和0～20 cm土层中的脲酶有激发效应；地膜覆盖能使土壤N2O排放量和耕层不同层次中的脲酶活性升高；N2O排放与耕层土壤脲酶活性之间具有极显著线性相关关系（y=4.560x+6.686,r=0.694**)，因此耕作层土壤脲酶活性可以作为旱作农田土壤N2O排放量的生物指标之一。 |
| 关键词: 土壤N2排放量 土壤脲酶活性；耕作措施 |
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| 基金项目:国家自然科学基金项目(39970459)，黄土高原土壤侵蚀与旱地农业国家重点实验室基金项目(10501-85)，西北农林科技大学专项基金项目 |
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| Study on N2O emission and urease activity in dryland soil |
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| Abstract: |
| Experiments were carried out to study the influence of different cultivation methods and plastic film mulching on the N2O emission and urease activity in field soil.The results showed that wheat cultivation would activate N2O emission and urease activity in the soil layer with a depth of 10-20 cm and 0-20 cm.The plastic film mulching would increase the N2O emission and urease activity in different soil layers.The N2O emission is positively related to the urease activity in tillable soil layers (y=4.560x+6.686,r=0.694**),that is the urease activity can be used as the bio-indicator for N2O emission to reflect the comprehensive influence of other factors. |
| Key words: N2O emission urease activity cultivation methods |
