摘要
采用D 312最优饱和设计和旱棚微区试验方法研究表明 ,在辽西半干旱区 ,春小麦在 3月份播种时 ,土壤剖面 4 0～ 6 0cm处有一水分含量较高的土层 ,且水分含量随土层深度的增加而增加 .在土壤水分垂直分布方面 ,0～ 5 0cm为土壤水分变化频繁活动层 ,5 0～ 10 0cm为水分潜在供应层 ,10 0cm以下为水分相对稳定层 .在春小麦生育前期 ,施用N肥能明显减少土壤表面水分的无效蒸发量 ,提高土壤含水量 .
The experiment with a D optimum design and watershed microplot shows that there was a maximum soil moisture horizon in the depth of 40～60 cm of the soil body in the spring wheat seeding time in March, and with the deepening of the soil horizon, the content of soil moisture of that increasing. As for the vertical distribution of moisture in soil, we could defined the horizon from surface to 50 cm depth as the active horizon, the soil moisture, which changed frequently, and the horizon from 50 cm to 100 cm depth as potential horizon for moisture supplying, as well as the horizon above 100 cm depth as a relatively stable horizon. Nitrogen application obviously decreased invalid evaporation of moisture from soil surface, and increased the moisture content in soil body, incorporating application N with P fertilizers could stimulate spring wheat to absorb moisture in the deep horizon of the soil body.
出处
《辽宁大学学报（自然科学版）》
CAS
2003年第1期7-12,共6页
Journal of Liaoning University：Natural Sciences Edition
基金
辽宁省教委项目 (990 12 13 699)
国家"九五"重点科技攻关项目 (96 0 0 4 0 4 10 0 2 )资助
