草地学报

草地学报 ›› 2019, Vol. 27 ›› Issue (4): 956-961.DOI: 10.11733/j.issn.1007-0435.2019.04.021

• 研究论文 • 上一篇    下一篇

模拟干旱和氮沉降对唐古特白刺根系生长特征的影响

段娜1,2, 李清河3,4, 陈晓娜2, 高君亮2, 多普增2, 张冉昊2, 汪季1   

  1. 1. 内蒙古农业大学沙漠治理学院, 内蒙古 呼和浩特 010010;
    2. 中国林业科学研究院沙漠林业实验中心, 内蒙古 磴口 015200;
    3. 中国林业科学研究院林业研究所, 北京 100091;
    4. 国家林业局林木培育重点实验室, 北京 100091
  • 收稿日期:2019-03-20 修回日期:2019-07-26 出版日期:2019-08-15 发布日期:2019-09-26
  • 通讯作者: 汪季
  • 作者简介:段娜(1986-),女,内蒙古丰镇市人,博士,工程师,研究方向为荒漠化防治及植物生理,E-mail:15149816558@163.com
  • 基金资助:
    国家自然科学基金（31470622）；国家林木（含竹藤花卉）种质资源平台建设与运行服务（2005DKA21003）共同资助

Combined Effects of Simulated Drought Stress and Nitrogen Deposition on Root Growth Characteristics of Nitraria tangutorum

DUAN Na1,2, LI Qing-he3,4, CHEN Xiao-na2, GAO Jun-liang2, DUO Pu-zeng2, ZHANG Ran-hao2, WANG Ji1   

  1. 1. Desert Science and Engineering College, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010010, China;
    2. Desert Forestry Experiment Center, Chinese Academy of Forestry, Dengkou, Inner Mongolia 015200, China;
    3. Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, China;
    4. Key Laboratory of Tree Breeding and Cultivation, State Forestry Administration, Beijing 100091, China
  • Received:2019-03-20 Revised:2019-07-26 Online:2019-08-15 Published:2019-09-26

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摘要： 为深入了解氮沉降和干旱胁迫对植物生长特征的影响，本试验选择荒漠植物唐古特白刺（Nitraria tangutorum），设置对照（田间最大持水量）与干旱（田间最大持水量的20%~40%）两个水分梯度以及0，6，36，60 mmol·L-1 4个氮素浓度处理，研究模拟干旱和氮沉降对其根系生长特征的影响。结果表明：正常水分条件下唐古特白刺根系生长状况均优于干旱条件（P<0.05）；根直径和根尖数随着氮素浓度的增加而增加（P<0.05）；当氮素浓度为36 mmol·L-1时，唐古特白刺的各项生长指标均表现为最佳状态。白刺各根系生长指标间相关分析表明，白刺总根长、根系平均直径、总表面积和总体积之间在水分和氮素交互作用下互相呈极显著正相关关系（P<0.01）。因此，本试验得出干旱胁迫抑制了氮素对根系生长的促进作用，而氮素的增加在一定程度上可缓减干旱对唐古特白刺的影响；在乌兰布和沙漠，干旱条件下氮沉降可能对唐古特白刺存在一定的补偿作用。

关键词: 白刺, 荒漠生态系统, 干旱胁迫, 氮沉降

Abstract: For the further understanding of the effects of nitrogen deposition and drought stress on plant growth characteristics responses mechanism in desert ecosystems to global climate change, we selected desert plant Nitraria tangutorum to determine the combined effects of drought stress and nitrogen deposition on their growth. Four levels of N addition (0, 6, 36, 60 mmol·L-1) and two soil watering regimes (100% and 20%~40% of field capacity) were used to simulate drought stress and nitrogen deposition. The results showed, under the control group, Nitraria tangutorum root growth was superior to drought conditions(P<0.05). With the enhancement of N supply, we found an increase in growth parameters (Root diameter and root number) (P<0.05). When the concentration of nitrogen was 36 mmol·L-1, growth indexes had best performance. For correlation analysis of each root growth index, it showed that total root length, root average diameter, total surface area and volume of Nitraria tangutorum had significant positive correlation under the interactions of water and nitrogen(P<0.01). Increasing drought stress counteracted the positive effects of N supply on plant growth. Increased N, however, could also alleviated the negative effects caused by drought stress. In Ulanbuh desert, nitrogen deposition under drought condition existed certain compensation effect for Nitraria tangutorum.

Key words: Nitraria tangutorum, Desert ecosystems, Drought Stress, Nitrogen Deposition

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