草地学报 ›› 2021, Vol. 29 ›› Issue (10): 2221-2232.DOI: 10.11733/j.issn.1007-0435.2021.10.013

• 研究论文 • 上一篇    下一篇

降水变化和生长方式对红砂和珍珠化学计量特征的影响

杨洁, 单立山, 苏铭, 魏晓芸, 马静, 解婷婷, 李毅   

  1. 甘肃农业大学林学院, 甘肃 兰州 730070
  • 收稿日期:2021-03-01 修回日期:2021-05-10 出版日期:2021-10-15 发布日期:2021-11-05
  • 通讯作者: 单立山,E-mail:shanls@gsau.edu.cn
  • 作者简介:杨洁(1997-),女,汉,甘肃金昌人,硕士研究生,主要从事荒漠植物生理生态研究,E-mail:yj1230163@163.com
  • 基金资助:
    国家自然科学基金(32160253,31960245);中央财政林业科技推广示范资金([2020]ZYTG15);对发展中国家常规性科技援助项目(KY202002011);甘肃省林业科技创新与国际合作资金(GLC2019-418-8);甘肃省科技创新基地与人才计划项目(17 JR7WA018)共同资助

Effects of Precipitation and Growth Pattern on the Stoichiometric Characteristics of Reaumuria soongorica and Salsola Passerina

YANG Jie, SHAN Li-shan, SU Ming, WEI Xiao-yun, MA Jing, XIE Ting-ting, LI Yi   

  1. College of Forestry, Gansu Agricultural University, Lanzhou, Gansu Province 730070, China
  • Received:2021-03-01 Revised:2021-05-10 Online:2021-10-15 Published:2021-11-05

摘要: 为揭示典型荒漠植物不同器官养分利用和调控策略对降水变化和生长方式的响应规律,本研究以红砂(Reaumuria soongorica)与珍珠(Salsola passerina)为材料,测定了不同降水梯度(年降水量50~300 mm,Δ=50)下单生和混生红砂和珍珠不同器官中的有机碳(C)、全氮(N)含量。结果表明:随降水量的减少(干旱胁迫增加),单生红砂叶C,C/N和茎N含量逐渐减小;单生珍珠茎和根C含量整体呈增大趋势,表明干旱胁迫加剧时,单生红砂茎受N限制作用增强,但红砂会通过降低叶片有机C含量和C/N以提高生长速率;单生珍珠会选择适当地增加地下部分根系的C分配比例,并将多余的C储藏在茎中。各降水量条件下,混生红砂叶C,C/N和根C,N含量均大于单生,茎C含量小于单生;混生珍珠茎C,C/N和根C,N含量均小于单生,叶C,C/N含量大于单生,表明混生后红砂倾向于向根系分配更多C,N,而珍珠主要通过降低茎的C/N来提高地上部分生长速率。

关键词: 降水变化, 生长方式, 有机碳, 全氮, 红砂, 珍珠

Abstract: In order to reveal the response of nutrient utilization and regulation strategies in different organs of typical desert plants to precipitation changes and growth patterns, Reaumuria soongorica and Salsola Passerina were taken as research objects in this study, and the carbon and nitrogen contents of different organs in monocultural and mixed plants were measured under different precipitation gradients (annual precipitation 50~300 mm, Δ=50). The results showed that, with the decrease of precipitation (with the increase of drought stress), the C content and C/N in leaves and N content in stems decreased in monocultural R. soongorica, the C content in stems and roots of monocultural S. Passerina showed a trend of increasing. This indicated that with the increase of drought stress, the effect of nitrogen limitation on the stem growth of monocultural R. soongorica increased while it could increase the growth rate by reducing the organic C content and C/N in leaves. The monocultural S. Passerina would choose to increase the proportion of C distribution in the root system and store the excess C in the stem. For each precipitation, the C, C/N contents in leaves, C, N contents in roots of mixed R. soongorica were higher than those in monocultural R. soongorica, while the C content in stems was lower than that in monocultural R. soongorica. The C, C/N contents in stems, C, N contents in roots of mixed S. Passerina were lower than those in monocultural S. Passerina, while the C, C/N contents in leaves were higher than those in monocultural S. Passerina, which indicated that R. soongorica tended to distribute more C and N to roots, while S. Passerina mainly increased the growth rate of above-ground part by reducing the C/N of stems for mixed growth.

Key words: Precipitation gradient, Growth pattern, Organic carbon, Total nitrogen, Reaumuria soongorica, Salsola passerina

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