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冰川冻土 ›› 2003, Vol. 25 ›› Issue (5): 585-590.

• 大气-植被-土壤相互作用研究 • 上一篇    下一篇


张小由, 龚家栋, 周茂先, 司建华   

  1. 中国科学院, 寒区旱区环境与工程研究所, 甘肃, 兰州, 730000
  • 收稿日期:2003-05-10 修回日期:2003-07-29 出版日期:2003-10-25 发布日期:2012-04-26
  • 作者简介:张小由(1963-), 男, 甘肃临洮人, 副研究员, 1987年毕业于北京林业大学, 现为中国科学院寒区旱区环境与工程研究所在职博士研究生.E-mail:zhangxy@ns.lzb.ac.cn
  • 基金资助:

A Study on the Stem Sap Flow of Populus euphrtaicr and Tamaris spp. by Heat Pulse Technique

ZHANG Xiao-you, GONG Jia-dong, ZHOU Mao-xian, SI Jian-hua   

  1. Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou Gansu 730000, China
  • Received:2003-05-10 Revised:2003-07-29 Online:2003-10-25 Published:2012-04-26

摘要: 应用热脉冲技术对干旱区胡杨(Populus euphrtaicr)和柽柳(Tamaris spp.)树干液流速度进行了研究.结果表明:在正常生长状态下,胡杨树干单位面积液流通量为0 34L·cm-2·d-1,柽柳为0 15L·cm-2·d-1.树液流速的日变化表现出多峰形特征,在午后有短暂液流急速减小的现象,而晚上植物为了补充体内水分亏缺,保持一定的树液流量.随着胸径的增大,茎流速率和茎流量也随之增大.在生长季节胸径21cm和15cm的胡杨日平均耗水量23.3L和19.25L;基径5cm和4cm的柽柳日平均耗水量0.62L和0.37L.在生长季节(5~10月)胡杨总蒸腾量为3419.4L,柽柳仅为63.9L.

关键词: 热脉冲技术, 树干液流, 胡杨, 柽柳

Abstract: The E jina natural oasis is located at the down stream alluvial plain of the Hei River and belongs to the desert vegetation zone of the inland river basins in the arid area of northwest China. Since 1950s, the desert plants at the down stream area of the Hei River, such as Populis euphrtaicr, Elaeag nusangastifolia, Tamarix spp and Haloxy lonammosdendron, have been reduced by about 30% to 70%. Therefore, it is necessary to investigate the regularities of water consumption of the desert plants. In this paper, the heat pulse technique was applied to study the stem sap flow of Populus euphrtaicr in and Tamaris spp. in the down stream desert vegetation zone of the Hei River Basin during the vegetation growing season from May to October of 2002. The results achieved show that, in the natural conditions, the ratio of sap flow of Populus euphrtaicr is 0.34 L·cm-2·d-1, while that of Tamaris spp. is much less, only 0.15 L·cm-2·d-1. The diurnal variation of sap flow velocity shows multi-peaks characteristics, and it has the sudden drop phenomenon with the least value in the afternoon. During the night, the sap flow still exists to keep the water supply for the plants. The amount and velocity of stem sap flow increase with the cross section of the plants. During the growth season, the water consumption of Populus euphrtaicr in with the diameter of 21 cm and 15 cm of the cross section is 23.30 L·d-1 and 19.25 L·d-1 respectively, while that of Tamaris spp. with the diameter of 5 cm and 4 cm of the cross section is 0.62 L·d-1 and 0.37 L·d-1 respectively. During the growth season from May to October, the total evapotranspiration is 3 419.4L for Populus euphrtaicr in and only 63.9 L for Tamaris spp.

Key words: heat pulse technique, sap flow, Populus euphrtaicr, Tamaris spp.


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