摘要
本文依据 1998年在半干旱黄土丘陵区安塞的观测资料 ,对沙棘叶水势的日、季变化规律及影响因子进行了分析研究。试验结果表明 :(1)沙棘叶水势均值为 - 1.171MPa,具明显的日、季变化 ,日、季化变曲线均呈单峰型。这种变化规律是多种外界和内部因子共同作用的结果 ,也是沙棘适应该地区生境和生理特性之一。(2 )沙棘叶水势的日、季变化与气温、大气相对湿度、照度、蒸腾强度间有十分显著的相关关系 ,复相关系数为 0 .96 54～ 0 .9975。 (3)沙棘叶水势的日、季变化与土壤水分间有十分显著的相关关系。土壤含水量下降 ,蒸腾加快 ,叶水势降低 ;土壤含水量增加 ,若蒸腾增大 ,叶水势仍降低 ,若蒸腾减小 ,叶水势回升。这为分析沙棘的抗旱 。
Based on the data observed at Ansai in 1998,daily and seasonal variations of leaf water potentied of seabuckthorn and related factors were analyzed. The results showed:① The average water potential was -1.17MPa, the variations were obvious and single peak curves could be observed. This was a combined function both internal and external factors, and reflected one of physiological characteristics of seabuckthorn adaptable to the local site. ② Clear correlation could be fund between the variations and temperature, relative humidity, illumination and transpiration intensity.③ Evident correlation existed between the variations and soil moisture, the transpiration went up and the water potential down while the soil moisture decreseased, the water potential was still lower when the transpiration and the soil moisture increased, however the water potential recovered when the transpiration decreased.This Provides a Scientific basis for analyzing drought-resistance of seabuckthorn, understanding water situation in the body of seabuckthorn and selecting physiological indicators for rational irrigation.
出处
《陕西林业科技》
北大核心
2000年第1期1-4,共4页
Shaanxi Forest Science and Technology
基金
国家科技部中俄国际合作项目
水利部"948"引进项目 !(No.975 1 5 4)资助
关键词
沙棘
叶水势
灌溉指标
气温
土壤水分
季节变化
Semi arid loess hilly region
seebuckthorn
leaf water potential
daily and seasonal variation
influence factors.
