摘要
根据多年农田试验和定位观测的结果,在分析旱塬农田土壤水分曲线特征的基础上,从耕层土壤和深层土壤两个层次研究了覆盖耕作对农田土壤水分有效性的影响,包括有效水含量、速动易效水与缓动易效水。结果表明:免耕覆盖量10500kg/hm2的处理耕层土壤总有效水含量最高,免耕覆盖量7500kg/hm2的处理次之,常规耕作最低;深层土壤有效水量的变化趋势也随秸秆覆盖量的增加而增加,常规耕作和免耕无覆盖差异不大,免耕覆盖量10500kg/hm2比常规耕作高34.5mm;耕层和深层土壤速动易效水与缓动易效水整体上均随秸秆覆盖量增加而增加,速动易效水较缓动易效水含量低。
This paper analyzed the soil water characteristic curve of Jinxi highland region according to the field's trial. On the basis of this, the effects of mulch tillage on soil water availability at plough layer and deep soil layer was discussed in detail. In plough layer, the total soil available water of no-tillage with (10 500) kg/ha residue was the highest and that of conventional tillage was the lowest. To the deep soil layer, the available water increased with residue increasing and the difference between conventional tillage and no tillage without residue was little. The total soil available water of no-tillage with 10 500 kg/ha residue was more 34.5 mm than that of conventional tillage. Both the rapid and slow available water content increased with the residue increasing. The rapid soil available water was lower than slow available water among the treatments.
出处
《华北农学报》
CSCD
北大核心
2005年第3期57-61,共5页
Acta Agriculturae Boreali-Sinica
基金
国家科技部"八五"
"九五"攻关项目(85-008-01-11
96-004-05-06)
