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应用生态学报 ›› 2017, Vol. 28 ›› Issue (11): 3461-3468.doi: 10.13287/j.1001-9332.201711.004

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扁刺栲不同根序细根形态和化学特征及其对短期氮添加的响应

陈冠陶1, 郑军2, 彭天驰1, 李顺1, 邱细容1, 陈雨芩1, 马豪宇1, 涂利华1*   

  1. 1 四川农业大学林学院, 成都 611130
    2 四川省遂宁市林业局, 四川遂宁 629000
  • 出版日期:2017-11-18 发布日期:2017-11-18
  • 通讯作者: *mail:tulhsicau@163.com
  • 作者简介:陈冠陶, 男, 1992年生, 硕士研究生.主要从事全球变化与森林生态研究.E-mail:imchengt@163.com
  • 基金资助:
    本文由国家自然基金项目(31300522)资助

Fine root morphology and chemistry characteristics in different branch orders of Castanopsis platyacantha and their responses to nitrogen addition

CHEN Guan-tao1, ZHENG Jun2, PENG Tian-chi1, LI Shun1, QIU Xi-rong1, CHEN Yu-qin1, MA Hao-yu1, TU Li-hua1*   

  1. 1 College of Fore-st, Sichuan Agricultural University, Chengdu 611130, China
    2 Suining Forestry Bureau, Suining 629000, Sichuan, China
  • Online:2017-11-18 Published:2017-11-18
  • Contact: *mail:tulhsicau@163.com
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (31300522)

摘要: 研究川西亚热带次生常绿阔叶林优势树种扁刺栲1~5级细根形态和化学特征,及其对氮添加的响应.结果表明: 随根序等级的增加,扁刺栲根直径、根组织密度、K含量增加,而比根长、比表面积及N、P、Mg含量降低.氮添加显著增加了扁刺栲细根N含量,降低了Mg含量和C/N,使细根Ca含量呈下降趋势,对根序C、P、K、Na、Al、Mn、Fe含量无显著影响.氮添加未显著影响扁刺栲细根直径、比根长、比表面积和根组织密度.在所有处理中,细根P含量均与各形态特征呈显著线性回归关系.氮添加处理下,细根Mg含量与形态特征之间的线性关系由不显著变为显著,而细根N含量与形态特征之间的线性关系由显著变为不显著.氮添加会影响根系营养元素含量,并增强植物对P和Mg的需求.

Abstract: Fine root morphology and chemistry characteristics of dominant species Castanopsis platya-cantha in an evergreen broad-leaved forest in subtropical China and their response to nitrogen (N) addition were determined in order 1st to 5th. With the increase of root order, C. platyacantha root diameter, tissue density (RTD), and K content increased, and specific root length (SRL), speci-fic surface area (SRA) and contents of N, P and Mg decreased. Nitrogen addition significant increased N content and decreased Mg content and C/N of fine roots. Root tissue Ca content had a decrease trend under N addition treatments. There were neither significant effects on the contents of C, P, K, Na, Al, Mn, Fe of fine roots, nor on fine root diameter, SRL, SRA and RTD. Root P content had a significant liner relationship with root morphology in the all treatments. Nitrogen addition changed the linear relationships between tissue Mg content and root morphology from no significant relationship to significant relationship, and linear relationships between tissue N content and root morphology from significant relationship to no significant relationship. N addition would affect the root tissue nutrient contents and could enhance P and Mg requirement of plants.