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中国沙漠 ›› 2014, Vol. 34 ›› Issue (3): 712-717.DOI: 10.7522/j.issn.1000-694X.2014.00005

• 生物与土壤 • 上一篇    下一篇

额济纳绿洲河岸胡杨(Populus euphratica)叶水势变化特征

李小琴1,2, 张小由1, 刘晓晴1,2, 高冠龙1,2   

  1. 1. 中国科学院寒区旱区环境与工程研究所 阿拉善荒漠生态水文试验研究站, 甘肃 兰州 730000;
    2. 中国科学院大学, 北京 100049
  • 收稿日期:2013-11-20 修回日期:2014-01-06 出版日期:2014-05-20 发布日期:2014-05-20
  • 作者简介:李小琴(1989-),女,陕西横山人,硕士研究生,主要从事干旱区生态水文学研究。Email:lixiaoqin@lzb.ac.cn
  • 基金资助:
    国家自然科学基金项目(41271037);国家科技支撑计划课题(2012BAD16B00);中国科学院内陆河流域生态水文重点实验室项目(90Y290F41)资助

Leaf Water Potential of Populus euphratica in the Ejin Oasis

Li Xiaoqin1,2, Zhang Xiaoyou1, Liu Xiaoqing1,2, Gao Guanlong1,2   

  1. 1. Alashan Desert Eco-hydrology Experimental Research Station,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences, Lanzhou 730000, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2013-11-20 Revised:2014-01-06 Online:2014-05-20 Published:2014-05-20

摘要: 利用WP4露点水势仪对额济纳绿洲胡杨(Populus euphratica )叶水势进行测定,研究了胡杨叶水势的日和月变化规律及其影响因子。结果表明:(1)胡杨叶水势日进程呈“V”形,最小值大都出现在13:00,日均值为-2.53±0.30 MPa;月变化呈先上升后下降趋势,月均值为-2.43±0.30 MPa。(2)树龄越小对应的叶水势越高;叶片着生部位越高,对应的水势越低;卵圆形叶水势整体稍高于披针形叶水势。(3)叶水势与气温、饱和水汽压差和蒸腾速率呈极显著线性负相关,相关系数依次为-0.87、-0.69和-0.88;与相对湿度和光合速率呈极显著二次多项式相关,相关系数分别为0.85和0.92。胡杨叶水势各方面的综合研究对于明晰胡杨的水分亏缺和抗旱机理有一定的理论指导意义。

关键词: 叶水势, 蒸腾, 胡杨(Populus euphratica), 额济纳绿洲

Abstract: Based on the data observed by WP4 Dewpoint Potential Meter at the Ejin Oasis, we mainly analyzed the daily and monthly variations in leaf water potential of Populus euphratica, and its relationship with impact factors. Results showed that it was a V-curve of the daily variation in leaf water potential of P. euphratica. The daily average value was -2.59±0.30 MPa and the minimums appear at 13:00 mostly. The monthly variation increased firstly and then decreased. The monthly average value was -2.44±0.30 MPa. As far as morphological difference was connected, trees with younger ages had higher leaf water potential. Leaves on the upper branches had lower water potential and vice versa. Water potentials of the oval leaves exceeded the lanceolate leaves as a whole. As far as environmental and plant physiological factors were connected, correlation analysis showed that there were highly significant negative linear correlations between leaf water potential and air temperature, vapor pressure deficit and transpiration rate. The correlation coefficients were -0.87, -0.69 and -0.88, respectively. Highly significant quadratic polynomial correlations were between leaf water potential and relative humidity and photosynthetic rate. The correlation coefficients were 0.85 and 0.92 in sequence. The study may provide theory guidance for better understanding of water stress and drought-resistance mechanism to of P. euphratica to some extent.

Key words: leaf water potential, transpiration, Populus euphratica, Ejin Oasis

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