Chinese Journal of Plant Ecology >
Effects of forest gap on losses of total phenols and condensed tannins of foliar litter in a subalpine forest of western Sichuan, China
Received date: 2021-09-09
Accepted date: 2022-04-22
Online 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)
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
DU Ting, CHEN Yu-Lian, BI Jing-Hui, YANG Yu-Ting, ZHANG Li, YOU Cheng-Ming, TAN Bo, XU Zhen-Feng, WANG Li-Xia, LIU Si-Ning, LI Han . Effects of forest gap on losses of total phenols and condensed tannins of foliar litter in a subalpine forest of western Sichuan, China[J]. Chinese Journal of Plant Ecology, 2023 , 47(5) : 660 -671 . DOI: 10.17521/cjpe.2021.0321
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