植物生态学报 ›› 2016, Vol. 40 ›› Issue (6): 543-553.DOI: 10.17521/cjpe.2015.0420

• 研究论文 • 上一篇    下一篇

夜间增温对亚高山针叶林主要树种无机氮吸收的影响

唐波1,2, 杨欢1,2, 尹春英1,,A;*(), 孙誉育1,2, 郑东辉1,2, 刘庆1   

  1. 1中国科学院成都生物研究所, 中国科学院山地生态恢复与生物资源利用重点实验室, 生态恢复与生物多样性保育四川省重点实验室, 成都 610041
    2中国科学院大学, 北京 100049
  • 收稿日期:2015-11-22 接受日期:2016-03-26 出版日期:2016-06-10 发布日期:2016-06-15
  • 通讯作者: 尹春英
  • 基金资助:
    国家自然科学基金(31370495和31070533)

Effects of night warming on the uptake of inorganic nitrogen by two dominant species in subalpine coniferous forests

Bo TANG1,2, Huan YANG1,2, Chun-Ying YIN1,*(), Yu-Yu SUN1,2, Dong-Hui ZHENG1,2, Qing LIU1   

  1. 1Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China

    2University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2015-11-22 Accepted:2016-03-26 Online:2016-06-10 Published:2016-06-15
  • Contact: Chun-Ying YIN

摘要:

吸收营养物质是植物根系的主要生理功能。氮素吸收是植物体内氮代谢的第一步, 也是最关键的一步。为了全面地认识亚高山针叶林在全球气候变化背景下对两种主要无机氮(NH4+和NO3-)吸收特点的变化, 该研究以川西亚高山针叶林优势树种——云杉(Picea asperata)和岷江冷杉(Abies fargesii var. faxoniana)为材料, 通过红外辐射加热器模拟增温, 利用非损伤微测技术(non-invasive micromeasurement technology)研究了这两个树种吸收NH4+和NO3-特点的变化, 同时还探究了NH4+和NO3- 之间的相互作用对植物吸收这两种离子的影响。研究结果显示: 在云杉根系中, NH4+和NO3-的最大吸收速率分别发生在距离根尖最顶端17-18 mm区域和17 mm处, 而岷江冷杉对这两种离子的最大吸收速率分别发生在距离根尖顶端11 mm和11.5 mm处。增温对云杉和岷江冷杉根系吸收NH4+和NO3-有促进作用。在增温条件下, NO3-能够促进云杉根系对NH4+的吸收, 而NH4+则抑制了其对NO3-的吸收。无论是否增温, 岷江冷杉对NH4+的吸收都不受NO3-的影响, 而在增温条件下, NH4+会抑制岷江冷杉对NO3-的吸收。

关键词: 夜间增温, N吸收, 针叶树, 高山森林

Abstract:

Aims Plant roots play a critical role in the uptake of nutrients, and nitrogen (N) absorption is considered as the first step and a pivotal process in N metabolism of plants. Our objective was to better understand the absorption of two major inorganic N forms (NH4+ and NO3-) in subalpine coniferous forests under global warming Methods Experimental warming using infrared heater was applied to two dominant species in subalpine coniferous forests of Sichuan, China, Picea asperata and Abies fargesiivar. faxoniana. The non-invasive micromeasurement technology was used to investigate the effects of warming on the uptake rates of NH4+ and NO3- and the potential interactions between these two ions.Important findings Results showed that the maximal net root uptake of NH4+ and NO3-occurred at a distance of 17-18 mm and 17 mm from root tips, respectively for P. asperata. and at a distance of 11 mm and 11.5 mm from root tips respectively for A. fargesiivar. faxoniana. Experimental warming elevated the uptake rates of NH4+ and NO3- in both species, but the interactions between NH4+ and NO3- differed between the two species. While NO3- uptake was inhibited in the presence of NH4+ for both P. asperataand A. fargesiivar. faxoniana, net NH4+ uptake was promoted by NO3- supply only in P. asperata roots under experimental warming.

Key words: night warming, N absorption, conifer tree, subalpine forest