摘要
为了解不同树种的水势变化差异,为评价喀斯特地区不同造林树种的耐旱性提供理论依据,通过对六种喀斯特造林树种在不同生长季节叶片水势的时间变化的测定,以及其与外界环境的关系的分析,结果表明:(1)6个树种苗木叶片水势日变化趋势为:早晨苗木叶片水势最高,随着气温的上升,水势逐渐降低,中午或午后达到最低值,随后又随气温的下降逐渐提高,形成单峰(侧柏、香樟、杜英)或者双峰(滇柏、刺槐、构树)曲线;(2)6个树种苗木在生长初期(4月份)水势最高,随着气温的升高,水势逐渐下降,在生长旺期(8月份)达到最低值,随后随着气温的逐渐降低又逐渐升高,不同树种升高幅度不同;(3)6个树种苗木在3个不同生长期内其叶片水势绝对值与大气温度呈正相关关系,与大气相对湿度之间则呈负相关关系。
evaluating drought-enduring capacity of plants in karst area,6 tree species seedlings change of leaf water potential and relationship between leaf potential and environment factors have been studied at different growing stages.The result showed that：（1）daily variation characteristic of leaf potential of 6 tree species seedlings was single （Platycladus orientalis （Linn.）Franco 、 Cinnamomum camphora （Linn.）Presl 、 Elaeocarpus sylvestris（Lour.）Poir） or double （Fokienia hodginsii （Dunn） Henry et Thomas 、 Robinia pseudoacacia L.、 Broussonetia papyrifera） peak curves;（2）leaf water potential of 6 tree species seedlings was maximal in early growth stage （April）.With increase of temperature it decreased and it was minimal in peak of growth stage （August）.Subsequently leaf water potential increased with decrease of temperature.Increase extent of leaf water potential was different in different tree species;（3）absolute value of 6 tree species seedlings leaf water potential and temperature all showed positive correlation relationship in different growth stage,while it showed negative correlation relationship with atmospheric moisture.
出处
《中国农学通报》
CSCD
北大核心
2010年第22期99-106,共8页
Chinese Agricultural Science Bulletin
基金
国家十一五科技支撑计划课题"石漠化综合治理与植被恢复技术研究"(2006BAD03A0303)
关键词
叶片水势
喀斯特
环境因子
抗旱性
leaf water potential
karst
environment factors
drought resistance
