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应用生态学报 ›› 2017, Vol. 28 ›› Issue (7): 2083-2092.doi: 10.13287/j.1001-9332.201707.021

• •    下一篇

两种荒漠生境条件下泡泡刺水分来源及其对降水的响应

周海, 赵文智*, 何志斌   

  1. 中国科学院西北生态环境资源研究院/中国+L8:L38生态系统研究网络临泽内陆河流域研究站/中国科学院内陆河流域生态水文重点实验室, 兰州 730000
  • 收稿日期:2017-02-27 修回日期:2017-05-03 发布日期:2017-07-18
  • 通讯作者: *mail:zhaowzh@lzb.ac.cn
  • 作者简介:周海,男,1985年生,博士.主要从事生态水文学研究.E-mail:zhouhai1201@126.com
  • 基金资助:
    本文由国家重点基础研究发展计划项目(2013CB429903)和中国博士后科学基金项目(2016M602902)资助

Water sources of Nitraria sibirica and response to precipitation in two desert habitats

ZHOU Hai, ZHAO Wen-zhi*, HE Zhi-bin   

  1. Northwest Institute of Eco-environment and Resources, Chinese Academy of Sciences/Linze Inland River Basin Research Station of Chinese Ecosystem Research Network/Laboratory of Heihe River Eco-Hydrology and Basin Science, Lanzhou 730000, China
  • Received:2017-02-27 Revised:2017-05-03 Published:2017-07-18
  • Contact: *mail:zhaowzh@lzb.ac.cn
  • Supported by:
    This work was supported by the National Key Basic Research Development Program of China (2013CB429903) and China Postdoctoral Science Foundation (2016M602902)

摘要: 泡泡刺通常以灌丛沙堆的形式存在,具有很强的生态适应性,在防风固沙、抗旱耐盐等方面具有独特的功能,但是水分条件仍然是限制其生存和发展的关键因素.为了明确泡泡刺在不同荒漠生境条件下的水分利用策略,研究了河西走廊临泽绿洲边缘沙质和砾质生境下泡泡刺的水分来源季节动态特征以及对不同降雨事件的响应程度.测定了两种生境下泡泡刺茎水和不同水源(降水、土壤水和地下水)的氧稳定同位素(δ18O)值,结合IsoSource模型计算了不同水源对泡泡刺水分来源的贡献比例.结果表明:两种生境下泡泡刺茎水δ18O值及其水分来源都存在显著的季节变化特征,沙质生境下泡泡刺在降水较少的春季和秋季主要利用地下水,其贡献率可达50%以上;而砾质生境下的泡泡刺无法利用深达11.5 m地下水,其水分来源受降水控制,具有较大的季节变异性.两种生境下的泡泡刺对降水响应显著,但是降水过后,随着土壤含水量的快速减小,沙质生境下的泡泡刺转而以丰富的地下水为主要水分来源,而砾质生境下的泡泡刺只能利用降水入渗至较深层土壤的较少水分.因此,两种生境下泡泡刺不同的水分利用策略是导致其生长特征差异的主要原因,同时也表明泡泡刺具有较强的自我调节和适应能力.

Abstract: Nitraria sibirica usually exists in a form of nebkhas, and has strong ecological adaptability. The plant species has distinctive function for wind prevention and sand fixation, and resistance drought and salt. However, the water condition is still a limiting factor for the plant survival and development. In order to understand the water use strategy of the plant in different desert habitats, we selected the N. sibirica growing in sandy desert habitat and gravel desert habitat to study the seaso-nal variation of plant water sources and response to precipitation at the edge of the oasis of Linze in the Hexi Corridor. We measured the oxygen stable isotope of the plant stem water and the different potential water sources (precipitation, soil water and ground water), and used the IsoSource model to calculate the proportion of water sources from the potential water. The results showed that there were significant seasonal variation characteristics of δ18O value and water source of stem water for the plant in the two habitats. In the sandy habitat, the plant used more ground water in the less precipitation seasons including spring and fall, and more than 50% of the water sources absorbed from ground water. However, under the condition of gravel habitat, the plant could not achieve the ground water level depth of 11.5 m, and its water source was controlled by precipitation, which had large seasonal variability. The water sources of N. sibirica had significant responses to the change of precipitation in the two desert habitats. Following the rapid decrease of soil water content after the precipitation events, the plant in the sandy habitat turned to use the abundant ground water as the main sources of water, while the plant in the gravel habitat only used the less water from precipita-tion infiltration to the deep soil. Therefore, different water use strategies of the plant in the two habitats were the main reason for the difference in growth characteristics, and it had a strong ability of self-adjustment and adaptation.