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Forest Ecosystems 2021, 8(3): 41 https://doi.org/10.1186/s40663-021-00321-z
Research | Open Access | Issue | Published: 06 July 2021

Different mechanisms underlying divergent responses of autotrophic and heterotrophic respiration to long-term throughfall reduction in a warm-temperate oak forest

Show Author's Information Jinglei Zhang1,  Shirong Liu1( ),  Cuiju Liu1,  Hui Wang1,  Junwei Luan2,  Xiaojing Liu3,  Xinwei Guo1,  Baoliang Niu1
Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing, 100091, China
Institute of Resources and Environment, Key Laboratory of Bamboo and Rattan Science and Technology of the State Forestry and Grassland Administration, International Centre for Bamboo and Rattan, Beijing, 100102, China
Baotianman Natural Reserve Administration, Neixiang, 474350, China
Keywords:
Bacterial community, Fine root, Prolonged drought, CO2 efflux, Fungal community
Cite this article:
Zhang J, Liu S, Liu C, et al. Different mechanisms underlying divergent responses of autotrophic and heterotrophic respiration to long-term throughfall reduction in a warm-temperate oak forest. Forest Ecosystems, 2021, 8(3): 41. https://doi.org/10.1186/s40663-021-00321-z
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Abstract Full text About this article
Background

There are many studies on disentangling the responses of autotrophic (AR) and heterotrophic (HR) respiration components of soil respiration (SR) to long-term drought, but few studies have focused on the mechanisms underlying its responses.

Methods

To explore the impact of prolonged drought on AR and HR, we conducted the 2-year measurements on soil CO2 effluxes in the 7th and 8th year of manipulated throughfall reduction (TFR) in a warm-temperate oak forest.

Results

Our results showed long-term TFR decreased HR, which was positively related to bacterial richness. More importantly, some bacterial taxa such as Novosphingobium and norank Acidimicrobiia, and fungal Leptobacillium were identified as major drivers of HR. In contrast, long-term TFR increased AR due to the increased fine root biomass and production. The increased AR accompanied by decreased HR appeared to counteract each other, and subsequently resulted in the unchanged SR under the TFR.

Conclusions

Our study shows that HR and AR respond in the opposite directions to long-term TFR. Soil microorganisms and fine roots account for the respective mechanisms underlying the divergent responses of HR and AR to long-term TFR. This highlights the contrasting responses of AR and HR to prolonged drought should be taken into account when predicting soil CO2 effluxes under future droughts.


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About this article

Different mechanisms underlying divergent responses of autotrophic and heterotrophic respiration to long-term throughfall reduction in a warm-temperate oak forest

Show Author's information Jinglei Zhang1, Shirong Liu1( ), Cuiju Liu1, Hui Wang1, Junwei Luan2, Xiaojing Liu3, Xinwei Guo1, Baoliang Niu1
Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing, 100091, China
Institute of Resources and Environment, Key Laboratory of Bamboo and Rattan Science and Technology of the State Forestry and Grassland Administration, International Centre for Bamboo and Rattan, Beijing, 100102, China
Baotianman Natural Reserve Administration, Neixiang, 474350, China

Abstract

Background

There are many studies on disentangling the responses of autotrophic (AR) and heterotrophic (HR) respiration components of soil respiration (SR) to long-term drought, but few studies have focused on the mechanisms underlying its responses.

Methods

To explore the impact of prolonged drought on AR and HR, we conducted the 2-year measurements on soil CO2 effluxes in the 7th and 8th year of manipulated throughfall reduction (TFR) in a warm-temperate oak forest.

Results

Our results showed long-term TFR decreased HR, which was positively related to bacterial richness. More importantly, some bacterial taxa such as Novosphingobium and norank Acidimicrobiia, and fungal Leptobacillium were identified as major drivers of HR. In contrast, long-term TFR increased AR due to the increased fine root biomass and production. The increased AR accompanied by decreased HR appeared to counteract each other, and subsequently resulted in the unchanged SR under the TFR.

Conclusions

Our study shows that HR and AR respond in the opposite directions to long-term TFR. Soil microorganisms and fine roots account for the respective mechanisms underlying the divergent responses of HR and AR to long-term TFR. This highlights the contrasting responses of AR and HR to prolonged drought should be taken into account when predicting soil CO2 effluxes under future droughts.

Keywords: Bacterial community, Fine root, Prolonged drought, CO2 efflux, Fungal community

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Publication history

Received: 15 March 2021
Accepted: 03 June 2021
Published: 06 July 2021
Issue date: September 2021

Copyright

© The Author(s) 2021.

Acknowledgements

Acknowledgements

We would like to thank the Baotianman Forest Ecosystem Research Station for experimental maintenance and Xiaodong Niu and Xiang Li for assistance in fieldwork.

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