青海高寒半干旱区沙木蓼水势研究  

Water Potential of Atraphaxis mandshurica in Qinghai Alpine Semi-arid Area

作　　者：李安超[1] 贺康宁[1] 郭倩倩[1] 孙晓涵[1] 王辉[1] 曹广月[1] 刘帅华[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：《湖南农业科学》2011年第8期146-149,153,共5页Hunan Agricultural Sciences

基　　金："十二五"国家科技计划(2011BA38B05)

摘　　要：2008年5月至8月,采用PSYPRO露点水势仪和稳态气孔计,对3年生沙木蓼的叶水势日变化、月变化进行了动态研究,并分析了其影响因子。结果表明:沙木蓼叶水势的日过程在6、8月份表现双峰曲线变化,5、7月份则表现单峰曲线规律,最低值出现在13∶00～15∶00,6～7月是沙木蓼生长需水的最关键时期;当供水充足时,沙木蓼叶水势的日变化取决于蒸腾速率的变化,其与大气温度、光辐射强度、大气相对湿度有显著的相关性,且三者综合因素对沙木蓼叶水势的影响要高于单因子对叶水势的影响;当土壤水受到限制时,沙木蓼叶水势与土壤含水量有显著正相关。The daily and monthly changes of leaf water potential （LWP） of 3-year-old Atraphaxis mandshurica was measured and dynamically studied by PSYPRO water potential and steady state Li-1600 respectively from May to August in the year of 2008, and theirs influencing factors were also analyzed. The results showed that daily change of LWP was double-peak curves in June and August, but it showed single-peak type in May and July; the minimum peak value took place at 13：00-15：00; the most critical period for water demand during growing season was from June to July. When water supply was sufficient, the daily change of leaf water potential depended on the changes of transpiration rate; it also had significant correlations with atmospheric temperature, photosynthetic active radiation and atmospheric relative humidity, and the influence of these three factors＇ combination on leaf water potential was larger than that of single factor on leaf water potential, There was a remarkable positive correlation between the LWP and the soil water content （SWC） when soil water was restricted.

关 键 词：青海 沙木蓼 叶水势 蒸腾速率 气象因子 土壤含水量 

分 类 号：S719[农业科学—林学]