| 1 | 极端干旱条件下多年生植物水分关系参数变化特性显示文摘通过对生长在塔克拉玛干沙漠南缘极端干旱区野外生境条件下的4种多年生植物胡杨、柽柳、沙拐枣和骆驼刺的主要水分关系参数(P100为膨压最大时的渗透势;P0为膨压为零时的渗透势;emax为最大细胞弹性模量;RWCa为细胞在质壁分离点时的相对含水量)在植物生长周期内的变化特征进行了分析,结合对植物清晨水势和土壤含水率变化的系统进行测定。结果表明:4种植物在低水势下保持膨压能力大小的排序为柽柳>胡杨>骆驼刺>沙拐枣。4种植物应对水分胁迫的共同反应是在细胞出现质壁分离时,保持高的体内含水量;在耐旱机理上,沙拐枣和骆驼刺属于高水势延迟脱水类型,胡杨和柽柳属于低水势忍耐脱水类型;在植物生长期内,4种植物清晨水势的变化特征是,骆驼刺的清晨水势值最高,沙拐枣和胡杨的清晨水势值的季节变化较为稳定,柽柳的清晨水势值最低;植物清晨水势的变化趋势同其水分关系参数的变化特性基本一致;4种植物没有受到严重的水分胁迫,灌溉对植物水分关系参数变化的影响不显著;植物处并利用地下水来满足其生存和生长需求,维持地下水位的基本稳定,是保证多年生植物恢复重建的重要前提。 | 曾凡江 李向义 张希明 A.FOETZKI S.K.ARNDT M.RUNGE | 2010 | 生态学杂志2010，29，2： | 12 |
| 2 | Water relation characteristics ofAlhagi sparsifolia and consequences for a sustainable management显示文摘Water relation characteristics of the desert legume Alhagisparsifolia were investigatedduring the vegetation period from April to September 1999 in the foreland of Qira oasis at thesouthern fringe of the Taklamakan Desert, Xinjiang Uygur Autonomous Region of China. The sea-sonal variation of predawn water potentials and of diurnal water potential indicated that Alhagiplants were well water supplied over the entire vegetation period. Decreasing values in the sum-mer months were probably attributed to increasing temperatures and irradiation and therefore ahigher evapotranspirative demand. Data from pressure-volume analysis confirmed that Alhagiplants were not drought stressed and xylem sap flow measurements indicated that Alhagiplantsused large amounts of water during the summer months. Flood irrigation had no influence on waterrelations in Alhagiprobably because Alhagiplants produced only few fine roots in the upper soillayers. The data indicate that Alhagisparsifolia is a drought-avoiding species that utilizes groundwater by a deep roots system, which is the key characteristic to adjust the hyper-arid environment.Because growth and survival of Alhagidepends on ground water supply, it is important that varia-tiohs of ground water depth are kept to a minimum. The study will provide a theoretical basis forthe restoration and management of natural vegetation around oasis in arid regions. | 曾凡江 张希明 A.Foetzki 李向义 李小明 M. Runge | 2002 | Science China Earth Sciences2002，45，z1： | 2 |
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