Influences of the bark economics spectrum and positive termite feedback on bark and xylem decomposition

Bin Tuo, En Rong Yan*, Chao Guo, Hang Ci, Matty P. Berg, Johannes H.C. Cornelissen

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

The plant economics spectrum integrates trade-offs and covariation in resource economic traits of different plant organs and their consequences for pivotal ecosystem processes, such as decomposition. However, in this concept stems are often considered as one unit ignoring the important functional differences between wood (xylem) and bark. These differences may not only affect the performance of woody plants during their lifetime, but may also have important “afterlife effects.” Specifically, bark quality may strongly affect deadwood decomposition of different woody species. We hypothesized that (1) bark quality strongly influences bark decomposability to microbial decomposers, and possibly amplifies the interspecific variation in decomposition by invertebrate consumption, especially termites; and (2) bark decomposition has secondary effects on xylem mass loss by providing access to decomposers including invertebrates such as termites. We tested these hypotheses across 34 subtropical woody species representing five common plant functional types, by conducting an in situ deadwood decomposition experiment over 12-month in two sites in subtropical evergreen broad-leaved forest in China. We employed visual examination and surface density measurement to quantify termite consumption to both bark and the underlying xylem, respectively. Using principal component analysis, we synthesized seven bark traits to provide the first empirical evidence for a bark economics spectrum (BES), with high BES values (i.e., bark thickness, nitrogen, phosphorus, and cellulose contents) indicating a resource acquisitive strategy and low BES values (i.e., carbon, lignin, and dry matter contents) indicating a resource conservative strategy. The BES affected interspecific variation in bark mass loss and this relationship was strongly amplified by termites. The BES also explained nearly half of the interspecific variation in termite consumption to xylem, making it an important contributor to deadwood decomposition overall. Moreover, the above across-species relationships manifested also within plant functional types, highlighting the value of using continuous variation in bark traits rather than categorical plant functional types in carbon cycle modeling. Our findings demonstrate the potent role of the BES in influencing deadwood decomposition including positive invertebrate feedback thereon in warm-climate forests, with implications for the role of bark quality in carbon cycling in other woody biomes.

Original languageEnglish
Article numbere03480
Pages (from-to)1-11
Number of pages11
JournalEcology
Volume102
Issue number10
Early online date16 Jul 2021
DOIs
Publication statusPublished - Oct 2021

Bibliographical note

Funding Information:
The authors like to thank Minshan Xu, Liting Zheng, Xiangyu Liu, Umar Aftab Abbasi, Tian Su, Wujian Xiong, Qiming Liang, Xiaotong Zhu, Liang Li, and Dong He for their field and laboratory assistance. This study was supported by the State Key Program of National Natural Science Foundation of China (Grant Nos. 32030068) and by China Scholarship Council (Grant Nos. 2019061401117). The authors declare no competing interests. E. R. Yan, C. Guo, B. Tuo, and J. H. C. Cornelissen designed this study; B. Tuo, C. Guo, H. Ci, and E. R. Yan carried out the field and lab work; B. Tuo, J. H. C. Cornelissen, E. R. Yan, M. P. Berg, and C. Guo discussed or carried out the data analysis; J. H. C. Cornelissen, C. Guo, and B. Tuo conceived the conceptual model. B. Tuo drafted the manuscript with input from all coauthors on one or more drafts.

Funding Information:
The authors like to thank Minshan Xu, Liting Zheng, Xiangyu Liu, Umar Aftab Abbasi, Tian Su, Wujian Xiong, Qiming Liang, Xiaotong Zhu, Liang Li, and Dong He for their field and laboratory assistance. This study was supported by the State Key Program of National Natural Science Foundation of China (Grant Nos. 32030068) and by China Scholarship Council (Grant Nos. 2019061401117). The authors declare no competing interests. E. R. Yan, C. Guo, B. Tuo, and J. H. C. Cornelissen designed this study; B. Tuo, C. Guo, H. Ci, and E. R. Yan carried out the field and lab work; B. Tuo, J. H. C. Cornelissen, E. R. Yan, M. P. Berg, and C. Guo discussed or carried out the data analysis; J. H. C. Cornelissen, C. Guo, and B. Tuo conceived the conceptual model. B. Tuo drafted the manuscript with input from all coauthors on one or more drafts.

Publisher Copyright:
© 2021 by the Ecological Society of America

Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.

Keywords

  • bark traits
  • carbon turnover
  • deadwood decomposition
  • evergreen broadleaved forest
  • inner and outer bark
  • invertebrate feedback
  • plant functional types
  • termite
  • trait diversity

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