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中文摘要：
通过设置在陇中黄土高原丘陵沟壑区的长期定位试验,研究了不同耕作措施下旱作春小麦叶水势的变化特征及其与环境因子的关系。结果表明,春小麦各生育期叶水势日变化均呈现自清晨逐渐降低,中午12：00-14：00降至最低,然后逐渐回升的趋势,且免耕秸秆覆盖处理各生育期春小麦叶水势的日均值均高于其他处理;春小麦各处理的叶片相对含水量均呈抽穗期〉拔节期〉开花期〉灌浆期的趋势,其中免耕结合秸秆覆盖处理下叶片相对含水量显著高于传统耕作处理,而叶片水分饱和亏的变化则与之相反;不同保护性耕作措施下春小麦叶水势与土壤含水量、气温、太阳辐射、大气相对湿度、大气水势均有显著的相关关系,其中大气水势是影响研究区春小麦叶水势日变化中最大的气象因子,其次是大气相对湿度、大气温度和太阳辐射。
英文摘要：
Based on a long-term experiment conducted in the Loess Plateau, the dynamics of leaf water potential of rain watered spring wheat, and the relationships between leaf water potential and environmental factors under different tillage patterns were studied. During the whole growing season, leaf water potential was highest in the early morning and lowest at 12：00 to 14：00, after which it gradually rose again. The daily average value of leaf water potential under no-till cultivation with straw mulching was higher than those under other treatments. The order of leaf relative water content at different growth stages was： heading〉jointing〉flowering〉 filling stage, and leaf relative water content under no-till with straw mulching was significantly higher than that under conventional tillage. The dynamics of water saturation deficient showed the opposite trends to that of rel- ative water content. Leaf water potential under different conservation tillage patterns had significant correlations with soil water content, air temperature, solar radiation, relative air humidity and air water potential. Air water potential had the greatest effect on the dynamics of leaf water potential in these areas, followed by relative air humidity, air temperature and solar radiation.
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