荒漠绿洲过渡带多枝柽柳树干液流特征及其与环境因子关系  

Stem sap flow variation of Tamarix ramosissima in oasis-desert ecotone and its response to environmental factors

作　　者：刘斐耀 尤全刚 薛娴[2,3] 张丽娟 LIU Feiyao;YOU Quangang;XUE Xian;ZHANG Lijuan(College of Geography and Tourism,Hengyang Normal University,Hengyang 421002;Drylands Salinization Research Station,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Minqin 733300;Key Laboratory of Desert and Desertification,Chinese Academy of Sciences,Lanzhou 730000;College of Foreign Languages,Hengyang Normal University,Hengyang 421002,China)

机构地区：[1]衡阳师范学院地理与旅游学院,衡阳421000 [2]中国科学院西北生态环境资源研究院干旱区盐渍化研究站,民勤733300 [3]中国科学院沙漠与沙漠化重点实验室,兰州730000 [4]衡阳师范学院外国语学院,衡阳421000

出　　处：《干旱区资源与环境》2024年第3期112-122,共11页Journal of Arid Land Resources and Environment

基　　金：湖南省教育厅优秀青年项目(22B0716);衡阳师范学院科学基金引进人才启动项目(2022QD12)资助。

摘　　要：防护林在维护干旱区绿洲稳定与风沙灾害防治过程中扮演着十分关键的作用。多枝柽柳(Tamarix ramosissima)是典型的耐贫瘠多年旱生灌木,是防护林重要的乡土物种之一,而多枝柽柳的蒸腾耗水量和该地区可利用水资源间的平衡决定了其生存和生长状态。文中利用包裹式茎流计于2020年5-10月对多枝柽柳树干液流进行监测,并同步对环境因子进行测量。结果表明:监测期间,多枝柽柳的累计树干液流量为75.43kg,日均树干液流量为523.8g·d^(-1),且具有明显的季节性特征;多枝柽柳树干液流速率分别与光合有效辐射、气温和饱和水汽压差呈显著正相关(P<0.001),与浅层土壤含水量(0-40cm)和中层土壤含水量(40-160cm)无显著相关;多枝柽柳通过树干液流峰值与气象因子峰值的“滞后”效应来适应环境。研究结果为进一步深入揭示多枝柽柳对干旱逆境的适应机制,以及为干旱区生态恢复和重建过程中造林物种的选取与管理提供参考。The shelterbelt forest between oases and desert plays a vital role in preventing aeolian disasters and desertification in arid regions.Tamarix ramosissima(T.ramosissima),a typical perennial and native xerophyte shrub in Northwest China,grows naturally and is widely used in constructing artificial shelterbelt forests.The balance between water consumption and the availability of water determines the survival and growth of T.ramosissima.And global climate change will further increase the pressure on water resources in this region.In this paper,the stem sap flow(SSF)gauges,working based on the energy balance method,were used to measure sap flow,and the environmental factors were monitored simultaneously.The result showed that the cumulative SSF of T.ramosissima was 75.43kg,and the average daily SSF was 523.8g:d^(-1),indicating the prominent seasonal characteristics.The daily SSF of T.ramosissima was positively correlated with air temperature,photosynthetically active radiation,and the vapor pressure deficit(P<0.001).We found that there was no significant relationship between daily SSF and soil moisture in shallow(0-40cm)and middle(40-160cm)soil layers.T.ramosissima adapts to severe water stress through the time lag between sap flow and meteorological factors.Deep soil water and groundwater play an extremely important role in the ecological restoration and reconstruction in this extremely water-limited environment.The result of this study offers valuable insight into revealing the adaptation mechanism of T.ramosissima to drought stress and for the selection and management of afforestation species during the process of ecological restoration and reconstruction in arid regions.

关 键 词：多枝柽柳 树干液流 气象因子 土壤水分 干旱区 

分 类 号：Q945[生物学—植物学]