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当前位置: 首页 > 文章 > 胡杨夜间液流通量及其影响因子研究 干旱区研究 2015,32 (6) 1173-1180
Position: Home > Articles > Nighttime Sap Flux of Populus euphratica and the Environment Factors Influecing It Arid Zone Research 2015,32 (6) 1173-1180

胡杨夜间液流通量及其影响因子研究

作  者：
赵春彦;司建华;冯起;鱼腾飞;李炜
单  位：
中国科学院寒区旱区环境与工程研究所
关键词：
胡杨(Populus euphratica);热比率法;液流通量;环境因子;额济纳绿洲;内蒙古
摘  要：
夜间液流在树木的整个生长过程中起着非常重要的作用,它不但与夜间蒸腾有关,而且有助于夜间自根系向上运输物质,为植物器官的夜间呼吸提供氧传递的机制。采用热比率技术,测量了荒漠河岸林自然生长条件下胡杨(Populus euphratica)的夜间液流通量大小、变化规律及影响因子。结果表明:1 4月胡杨夜间液流通量变化不大;5月和9月前半夜缓慢下降,后半夜缓慢上升,但变化幅度不大;6、7、8月均呈先下降后上升的趋势,且变化幅度较5月和9月大。2前半夜胡杨累积液流量约占整夜液流量的53%~62%,而后半夜仅占整夜累积液流量的38%~47%;后半夜液流通量显著低于前半夜;胡杨各月夜间累积液流量占整日累积液流量的比例依次为:4月(45.7%)>5月(30.7%)>8月(30.1%)>9月(29.5%)>6月(28.6%)>7月(26.2%),春季夜间累积液流量占整日累积液流量的比例大于夏季和秋季。3胡杨夜间液流通量受水汽压差、气温等影响,就4—9月来看,胡杨夜间液流通量与环境因子的相关系数依次为:水汽压差(0.63)>气温(0.58)>空气相对湿度(-0.335)>土壤含水量(0.17)。水汽压差是影响夜间液流通量最关键的因子。
译  名：
Nighttime Sap Flux of Populus euphratica and the Environment Factors Influecing It
作  者：
ZHAO Chun-yan;SI Jian-hua;FENG Qi;YU Teng-fei;LI Wei;Key Laboratory of Ecohydrology of Inland River Basin,Alxa Desert Ecohydrological Experimental Research Station ,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences;University of Chinese Academy of Science;
关键词：
Populus euphratica;;heat ratio method;;nighttime sap flow flux;;environment factors;;Ejin natural oasis;;Inner Mongolia
摘  要：
Sap flow flux and water recharge characteristics through night time stem sap flow of Populus euphratica were analyzed based on the experimental data of sap flow in the Ejina oasis from April to October,2012. The results showed that: 1 In April,the range of nighttime sap flow flux was little. It was fallen that night time sap flow flux in May and September. June to August,the night time sap flow flux of P. euphratica sometimes was increased and sometimes was decreased. 2 The night time sap flow flux of sunset to midnight as a percentage of total night time sap flow flux was 53%-62%,the night time sap flow flux of midnight to small hours as a percentage of total night time sap flow flux was 38%-47%,the major duration of nighttime sap flow flux was from sunset to midnight and significantly higher than the small hours. In different months the contribution of the cumulative nighttime sap flow flux to the total nighttime sap flow flux was 45. 7%,30. 7%,28. 6%,26. 2%,30. 1%,29. 5% from April to September,respectively. In general speaking,in spring,the contribution of nighttime sap flow flux to total nighttime sap flow flux was more than summer and autumn. 3 The nighttime sap flow flux of P. euphratica is affected by many environmental factors such as air temperature( Ta),relative humidity( RH),vapor pressure deficit( VPD),soil moisture( θ). During April to September,VPD is a key factor which influenced nighttime sap flow flux.

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