黄土高原西部高寒区引进树种银水牛果叶水势研究  

Study on the Leaf Water Potential of Shepherdia argentea in the Western Loess Plateau Alpine Zone

作　　者：刘静[1] 贺康宁[1] 韩磊[1] 

机构地区：[1]北京林业大学水土保持学院,水土保持与荒漠化防治教育部重点实验室,北京100083

出　　处：《水土保持研究》2009年第5期194-198,共5页Research of Soil and Water Conservation

基　　金：国家“十一五”科技支撑专题“黄土高原西部高寒区水土保持型林草植被恢复技术试验示范”(2006BAD03A1203)

摘　　要：2008年5-8月,采用PSYPRO露点水势仪,以3a生银水牛果为试材,对叶水势的日、月变化进行了动态研究,并对相关影响因子进行了分析。结果表明:银水牛果叶水势的日变化过程除5月份外均表现为双谷曲线,最低值出现在13:00-15:00;6-7月是银水牛果生长需水的最关键时期,这一时期叶水势的日均值较低;当供水充足时,叶水势的日变化取决于蒸腾速率的变化,其与气温、光照呈显著的负相关,与湿度呈显著正相关,且三者综合效应对叶水势的变化起很大作用;当土壤水受到限制时,盆栽银水牛果苗木的清晨叶水势与土壤含水量有显著正相关性,苗木的永久萎蔫系数为4.76%。The leaf water potential（LWP） of 3-year-old Shepherdia argentea was measured by PSYPRO water potential guage from May to August in 2008. This paper analyzed daily and monthly variations of LWP of Shepherdia argentea and related factors. The results showed： daily changes of LWP were double peak curves every month except May and the minimum peak value of LWP took place at 13：00-15：00. The most critical periods for water supply in growing season were June and July and in which LWP were Iower. The study also showed changes of transpiration rate depended on daily changes of LWP which had a significant negative correlation to air temperature and intensity of illumination and a significant positive correlation to air relative humidity under the full water supply. Moreover, integrated meteorological fac tors played an important role in changes of LWP. What＇s more, pre-dawn LWP of potted Shepherdia argentea had a significant positive correlation to soil water content when soil water was restricted and perma nent wilting percentage of Shepherdia argentea was 4.76 %.

关 键 词：银水牛果 叶水势 气象因子 土壤含水量 

分 类 号：S718.3[农业科学—林学]