摘要
田间和盆栽试验研究表明叶水势日变化曲线因供水和生育时期而不同.黎明前叶水势(ψl^(pre))开花期低谷十分明显,与土壤水分动态变化不一致;午后叶水势(ψl^(mid))表现为前期低中期高后期渐降的变化特点,不同水文年型间存在差异.生育中后期叶水势与深层土壤水分含量的相关程度增强,开花期叶水势与产量关系最为密切.前期控水式的节水栽培在一定程度上降低生育期叶水势,可通过渗透调节功能和较高膨压的维持稳定高产.
It was shown by the field and pot experiments that diurnal changes of leaf water potential were dependent on watering amount, watering time and growth stages. The pre-dawn leaf water potential at anthesis stage, declined sharply, and was inconsistent with the change of soil water content. The mid-day leaf water potential showed low in early period, high in middle and gradually decline in late, and varied with years. The correlation of leaf water potential with water content in deeper soil layers increased as the growth stage developed. There was a close relation between leaf water potential at anthesis stage and yield. Water saving practice by early water stress reduced leaf water potential to some extent, however, osmotic regulation and turgor pressure maintenance could allow wheat to achieve high yield.
出处
《作物学报》
CAS
CSCD
北大核心
1995年第4期451-457,共7页
Acta Agronomica Sinica
基金
国家自然科学基金资助
关键词
冬小麦
节水栽培
叶水势
土壤水分含量
小麦
Winter wheat
Water-saving
Leaf water potential
Soil water content
