摘要
１９９１ ～１９９５ 年，在陇东半湿润易旱地区以冬小麦为供试作物，通过氮、磷、有机肥三因素试验从生态学角度探讨了施肥对提高水分利用效率的机理。结果表明，施肥，尤其是氮磷化肥配施，可明显促进冬小麦根系生长，扩大觅水空间；氮磷化肥配施具有时效互补性和功能互补性；与不施肥处理相比，施肥处理蒸散量仅提高了５４ ％ ，而产量和水分利用效率却分别提高了９２８ ％ 和７９７ ％ ；施肥促进了冬小麦冠层发育，增加了蒸腾量，而减少了蒸发量，从而提高了腾／发比，使水分利用效率及水分生产力大幅度提高。
The mechanism of fertilization in increasing water use efficiency(WUE) has been studied by the field experiments with nitrogen, phosphorus and farm manure in the east area of subhumid lands prone to drought, Gansu province, from 1991 to 1995. The experiment results indicate: The winter wheat root growth can be stimulated by fertilization, especially by combination of nitrogen and phosphorus, so it may be extended the space of water uptake by roots. When nitrogen and phosphorus couple, they may supplement one another in the growth stages and the function. Compared with no fertilization, on an average, the evapotranspiration of the treatments with fertilization increased by 5.4%, but the yields and WUE increased by 92 8% and 79 7%,respectively. Fertilization may stimulate the growth of canopy of winter wheat, increase the amount of transpiration and decrease the amount of evaporation, so it may enhance the ratio of transpiration to evaporation, WUE and productivity of water.
出处
《植物营养与肥料学报》
CAS
CSCD
1999年第3期221-226,共6页
Journal of Plant Nutrition and Fertilizers
关键词
施肥
旱地
冬小麦
根系
水分利用效率
Fertilization
Dryland
Winter wheat
Root system
Water use efficiency(WUE)
