植物生态学报 ›› 2023, Vol. 47 ›› Issue (6): 856-866.DOI: 10.17521/cjpe.2022.0183

• 研究论文 • 上一篇    下一篇

增温对成熟杉木人工林不同季节细根生长、形态及生理代谢特征的影响

吴帆1,2, 吴晨1,2, 张宇辉1,2, 余恒1,2, 魏智华1,2, 郑蔚1,2, 刘小飞1,2, 陈仕东1,2, 杨智杰1,2, 熊德成1,2,*()   

  1. 1福建师范大学福建省植物生理生态重点实验室, 福建师范大学地理科学学院, 福州 350007
    2福建三明森林生态系统国家野外科学观测研究站, 福建三明 365000
  • 收稿日期:2022-05-07 接受日期:2022-09-28 出版日期:2023-06-20 发布日期:2022-09-28
  • 通讯作者: * (xdc104@163.com)
  • 基金资助:
    国家自然科学基金(32071743);国家自然科学基金(31930071);国家重点基础研究计划(2014CB954003)

Effects of warming on growth, morphology and physiological metabolism characteristics of fine roots in a mature Cunninghamia lanceolata plantation in different seasons

WU Fan1,2, WU Chen1,2, ZHANG Yu-Hui1,2, YU Heng1,2, WEI Zhi-Hua1,2, ZHENG Wei1,2, LIU Xiao-Fei1,2, CHEN Shi-Dong1,2, YANG Zhi-Jie1,2, XIONG De-Cheng1,2,*()   

  1. 1Fujian Provincial Key Laboratory for Plant Eco-physiology, School of Geographical Sciences, Fujian Normal University, Fuzhou 350007, China
    2Fujian Sanming Forest Ecosystem National Observation and Research Station, Sanming, Fujian 365000, China
  • Received:2022-05-07 Accepted:2022-09-28 Online:2023-06-20 Published:2022-09-28
  • Contact: * (xdc104@163.com)
  • Supported by:
    National Natural Science Foundation of China(32071743);National Natural Science Foundation of China(31930071);National Key Basic Research Plan of China(2014CB954003)

摘要:

为揭示气候变暖对我国亚热带地区人工林生态系统细根动态过程的影响, 在福建三明森林生态系统国家野外科学观测研究站开展成熟杉木(Cunninghamia lanceolata)人工林野外原位土壤增温实验, 采用内生长环法探究增温在不同季节对成熟杉木人工林细根生长量、形态及生理代谢特征的影响。结果表明: 与对照相比, 在雨季, 增温处理使得0-1 mm细根生长量及细根(0-2 mm)总生长量显著增加109.9%和78.2%, 0-1 mm细根比根长(SRL)和可溶性糖含量显著增加28.8%和41.5%, 而细根比呼吸速率(SRR)和淀粉含量显著降低64.1%和15.9%; 在旱季, 增温处理使得0-1和1-2 mm细根生长量及各形态指标均无显著变化, 而0-1 mm细根SRR、1-2 mm细根淀粉和非结构性碳水化合物(NSC)含量显著降低60.7%、43.9%和14.2%。因此, 在未来气候变暖背景下, 中亚热带地区成熟杉木人工林具有较强的适应能力。雨季, 成熟杉木人工林可能通过增加细根SRL, 吸收更多资源并促进淀粉向可溶性糖的转化来维持正常生理活动以促进细根生长来响应增温。旱季, 成熟杉木人工林则采取降低细根SRR、减少体内养分消耗并增加对NSC的利用, 提高水分运输效率以维持细根正常生长的策略来响应增温; 而调整细根SRL、比表面积和根组织密度可能不是其响应增温的主要策略。

关键词: 土壤增温, 杉木, 人工林, 细根生长, 形态, 生理代谢

Abstract:

Aims The objective of this study was to reveal the effects of climate warming on fine root dynamics of a plantation in subtropical China.

Methods An in situ soil warming experiment in a mature Cunninghamia lanceolataplantation was conducted at the Fujian Sanming Forest Ecosystem National Observation and Research Station. The effects of soil warming on the growth, morphology and physiological metabolism characteristics of fine roots in this mature plantation in different seasons were investigated by using the in-growth core method.

Important findings In the rainy season, warming significantly increased the growth of 0-1 mm fine roots and total fine roots (0-2 mm) by 109.9 % and 78.2% respectively, and also increased the specific root length (SRL) and soluble sugar content of 0-1 mm fine roots by 28.8% and 41.5% respectively, compared with the control. However, warming significantly decreased the root specific respiration rate (SRR) and starch content of total fine roots by 64.1% and 15.9% respectively. In the dry season, there were no significant changes in the growth and morphological indices of 0-1 mm and 1-2 mm fine roots after warming, while the SRR of 0-1 mm fine roots and the contents of starch and non-structural carbohydrates (NSC) of 1-2 mm fine roots were significantly reduced by 60.7%, 43.9% and 14.2% respectively. Therefore, under future climate warming, the mature C. lanceolata plantation may have strong adaptability in the subtropical region. During the rainy season, the mature C. lanceolata plantation maintains normal physiological activities by increasing fine root SRL to absorb more resources and promoting the transformation of starch to soluble sugar, so as to promote the growth of fine roots in response to warming. In the dry season, the mature C. lanceolata plantation responds to the warming by reducing the SRR of fine roots to reduce internal nutrient depletion and increasing the NSC utilization to improve water transport efficiency to maintain normal fine root growth; adjusting the SRL, specific root surface area and root tissue density of fine roots may not be the main strategies for the mature C. lanceolata plantation in response to warming.

Key words: soil warming, Cunninghamia lanceolata, plantation, fine root growth, morphology, physiological metabolism