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Research Article
Jinglei Zhang
Chinese Academy of Forestry Institute of Forest Ecology Environment and Protection
Corresponding Author
ORCiD: https://orcid.org/0000-0002-4725-7909
License:
This work is licensed under a CC BY 4.0 License. Read Full License
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
Prolonged drought, CO2 efflux, Fine root, Bacterial community, Fungal community
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View the published article at Forest Ecosystems.
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Received 09 Apr, 2021
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Received 22 Mar, 2021
Reviewer #1 agreed
On 22 Mar, 2021
Reviewers invited
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On 16 Mar, 2021
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Subject Areas
Forestry
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A new preprint design is coming!
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See the published version of this preprint at Forest Ecosystems.
This is a preprint, a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
Learn more about In Review
Research Article
Jinglei Zhang
Chinese Academy of Forestry Institute of Forest Ecology Environment and Protection
Corresponding Author
ORCiD: https://orcid.org/0000-0002-4725-7909
Badges
Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
Prescreen
Peer Review Timeline
CURRENT STATUS: Published
View the published article at Forest Ecosystems.
Version 1
Posted 24 Mar, 2021
No community comments so far
Review #1 received
Received 09 Apr, 2021
Reviewer #2 agreed
On 22 Mar, 2021
Reviews received
Received 22 Mar, 2021
Reviewer #1 agreed
On 22 Mar, 2021
Reviewers invited
Invitations sent on 21 Mar, 2021
Editor assigned
On 16 Mar, 2021
Submission checks complete
On 16 Mar, 2021
Editor invited
On 16 Mar, 2021
First submitted
On 15 Mar, 2021
Metrics
Comments: 0
PDF Downloads: ...
HTML Views: ...
Subject Areas
Forestry
License:
This work is licensed under a CC BY 4.0 License. Read Full License
View the published article at Forest Ecosystems.
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.
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
This is a list of supplementary files associated with this preprint. Click to download.
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