植物生态学报 ›› 2023, Vol. 47 ›› Issue (5): 660-671.DOI: 10.17521/cjpe.2021.0321

• 研究论文 • 上一篇    下一篇

林窗对川西亚高山凋落叶总酚和缩合单宁损失动态的影响

杜婷1, 陈玉莲1, 毕境徽2, 杨玉婷1, 张丽1, 游成铭1, 谭波1, 徐振锋1, 王丽霞1, 刘思凝1, 李晗1,*()   

  1. 1.四川农业大学生态林业研究所, 长江上游林业生态工程四川省重点实验室, 长江上游森林资源保育与生态安全国家林业和草原局重点实验室, 高山森林生态定位研究站, 成都 611130
    2.重庆文理学院, 重庆 402160
  • 收稿日期:2021-09-09 接受日期:2022-04-22 出版日期:2023-05-20 发布日期:2022-04-22
  • 通讯作者: * (hannahlisc@163.com)
  • 基金资助:
    国家自然科学基金(31901295);国家自然科学基金(32071745);国家自然科学基金(31870602);四川省杰出青年科技人才计划项目(2020JDJQ0052);四川省应用基础研究项目(2021YJ0340)

Effects of forest gap on losses of total phenols and condensed tannins of foliar litter in a subalpine forest of western Sichuan, China

DU Ting1, CHEN Yu-Lian1, BI Jing-Hui2, YANG Yu-Ting1, ZHANG Li1, YOU Cheng-Ming1, TAN Bo1, XU Zhen-Feng1, WANG Li-Xia1, LIU Si-Ning1, LI Han1,*()   

  1. 1. Institute of Ecology and Forest of Sichuan Agricultural University, Forestry Ecological Engineering in the Upper Reaches of the Yangtze River Key Laboratory of Sichuan Province, National Forestry and Grassland Administration Key Laboratory of Forest Resources Conservation and Ecological Safety on the Upper Reaches of the Yangtze River, Long-term Research Station of Alpine Forest Ecosystems, Chengdu 611130, China
    2. Chongqing University of Arts and Sciences, Chongqing 402160, China
  • Received:2021-09-09 Accepted:2022-04-22 Online:2023-05-20 Published:2022-04-22
  • Supported by:
    National Natural Science Foundation of China(31901295);National Natural Science Foundation of China(32071745);National Natural Science Foundation of China(31870602);Program of Sichuan Excellent Youth Sci-Tech Foundation(2020JDJQ0052);Program of Sichuan Applied Basic Research Foundation(2021YJ0340)

摘要:

总酚和缩合单宁作为重要组分参与并调控森林凋落物的分解过程, 其可能受到林窗直接或间接的影响。该研究以川西亚高山6种常见植物(包括方枝柏(Juniperus saltuaria)、岷江冷杉(Abies fargesii var. faxoniana)、四川红杉(Larix mastersiana)、红桦(Betula albosinensis)、康定柳(Salix paraplesia)和高山杜鹃(Rhododendron lapponicum))凋落叶为研究对象, 在林窗内外不同位置(林窗中心、林冠林窗、扩展林窗、郁闭林下)进行为期3年的原位分解实验, 探究凋落叶总酚和缩合单宁在3年分解过程中冬季和生长季节的动态特征。研究发现凋落叶总酚和缩合单宁均在分解第一年具有较高的损失速率, 分别为10.76和8.5 mg·d-1; 林窗对酚类物质降解的影响随分解进程逐渐减弱并具有明显的季节性差异; 6种凋落叶总酚含量均在生长季降低较快, 且初始缩合单宁含量较高的凋落叶在第一年冬季有较高的缩合单宁损失速率。研究表明森林林窗内的凋落叶在长期分解过程中, 其酚类物质的降解受凋落叶质量和季节差异的影响更为显著。研究结果有利于深入认识森林生态系统中凋落物的分解特征和物质循环过程, 可为亚高山森林的有效经营管理提供一定的科学数据。

关键词: 林窗, 分解, 总酚, 缩合单宁, 季节动态, 亚高山

Abstract:

Aims As key components in plant litters, the total phenols and condensed tannins greatly regulate decomposition process of forest litter, which can be directly or indirectly affected by forest gaps. The aim of this study was to determine how the forest gaps would affect the losses of total phenols and condensed tannins of foliar litter during decomposition in subalpine forest.
Methods We conducted a three-year in situ litter decomposition experiment on different forest gaps (i.e. gap center, canopy gap, expanded gap, closed canopy) in a subalpine forest of western Sichuan, and six foliar litters including Juniperus saltuaria, Abies fargesii var. faxoniana, Larix mastersiana, Betula albosinensis, Salix paraplesia and Rhododendron lapponicum were selected. The measurements were conducted to examine the losses of litter total phenols and condensed tannins during winter and growing season.
Important findings Litter total phenols and condensed tannins showed higher loss rates in the first decomposition year, with the levels of 10.76 mg·d-1 and 8.5 mg·d-1, respectively. The effects of forest gaps on the degradation of phenolic components gradually were getting weak with the litter decomposition proceeding, and exhibited obvious seasonal differences. The total phenols content of six litters all decreased rapidly in the growing seasons, while litters with higher initial condensed tannins with faster loss rate were found in the first winter, suggesting that both litter quality and seasons would significantly alter litter phenolic components losses during long-term decomposition under forest gaps. These results are helpful for deeper understanding of the litter decomposition process and nutrients cycling in forest ecosystems, which provide scientific data to improve the development of management policies in subalpine forests.

Key words: forest gap, decomposition, total phenols, condensed tannins, seasonal dynamic, subalpine