| 雷金银,吴发启,王健,李荣标.毛乌素沙地南缘保护性耕作对土壤化学性质的影响[J].干旱地区农业研究,2008,(6):1~7 |
| 毛乌素沙地南缘保护性耕作对土壤化学性质的影响 |
| The effects of conservation tillage systems on soil chemical properties in southern part of Mu Us |
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| DOI：10.7606/j.issn.1000-7601.2008.06.01 |
| 中文关键词: 保护性耕作 土壤化学性质 土壤退化 毛乌素沙地 靖边县北部 |
| 英文关键词:conservation tillage soil chemical properties soil degradation Mu Us sand land North of Jingbian |
| 基金项目:农业科技成果转化基金项目“陕北农牧交错区农田综合防沙技术中试与转化”(03EFN217100323) |
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| 中文摘要: |
| 采用免耕(NT)、秸秆覆盖(SM)、覆膜(PM)和翻耕(CT)4种耕作措施,研究保护性耕作对毛乌素沙地南缘土壤化学性质的影响。结果表明,免耕和秸秆覆盖措施下表层0～20 cm土壤pH值低于覆膜、翻耕。免耕和秸秆覆盖措施下土壤有机质、碱解氮、速效钾和速效磷有明显的表层富集现象。随着耕作时间的变化,不同耕作措施下土壤有机质和速效钾都有所增加,免耕、秸秆覆盖、覆膜和翻耕有机质相对于试验开始前分别增加了33.0%、32.3%、31.1%和6.5%,而碱解氮和速效磷有下降的趋势,但保护性耕作条件下其下降率低于翻耕。保护性耕作不利于全氮的积累,经过3年试验后,免耕、秸秆覆盖和覆膜措施下的土壤全氮含量都低于翻耕。耕作措施对全磷的影响不大。说明保护性耕作是实现沙区农田生产力持续发展、保持土壤养分和防治土壤退化行之有效的措施。 |
| 英文摘要: |
| In order to protect soil and water on cropland and reduce soil erosion an experiment of conservation tillage with corn planting was conducted. The field experiment adopted no-tillage （NT） stalk-mulching （SM） plastic mulching （PM） and conventional tillage （CT） to investigate the effects of the conservation tillage on soil chemical properties. The results indicted that soil pH at the depth of0～20cm under NT and SM was lower than PM and CT. Under NT and CT soil organic matter available N available K available P were accumulated on the top soil. The soil organic matter and available K increased with the implementing times of tillage. And the available N and available P decreased but the NT SM and PM decreased slower than CT. NT was adverse for the accumulation of total N and the tillage system had no effect on the total P. The over results showed the conservation tillage was a major way for developing sustainable soil productivity conserving soil fertilities and controlling soil degradation in sandy area. |
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