Details
| Original language | English |
|---|---|
| Pages (from-to) | 95-109 |
| Number of pages | 15 |
| Journal | Plant and soil |
| Volume | 494 |
| Issue number | 1-2 |
| Early online date | 11 Sept 2023 |
| Publication status | Published - Jan 2024 |
Abstract
Aims: Accurate predictions of soil carbon (C) feedbacks to climate change depend on an improved understanding of temperature sensitivity (Q10) of soil organic matter (SOM) decomposition. Although rhizosphere processes play a critical role in SOM decomposition, the rhizosphere effects on Q10 and their underlying microbial mechanisms remain unclear. Methods: Natural abundance approach was used to measure the rhizosphere priming effect (RPE) of maize under two temperature regimes in a 50-day pot experiment. We further determined the impact of rhizosphere process on the Q10 of SOM decomposition. Enzymatic kinetics, microbial growth rate, as well as 13C-phospholipid fatty acid (13C-PLFA) biomarkers were identified to evaluate the responses of microbial activity. Results: Warming relative to ambient increased the plant-derived C input, stimulated microbial growth rate, and enzyme activities by 87%, 23%, and 7–18%, respectively. Consequently, warming increased the RPE of maize up to 1-folds, and further caused a larger net C loss as compared to ambient after 50 days of transplanting. Gram negative bacteria and actinobacteria were important groups controlling the RPE, which was supported by the positive correlations between RPE and the abundance of gram negative and actinobacteria. Furthermore, we concluded a literature review and the results were consistent with our case study, where the presence of roots increased the temperature sensitivity of SOM decomposition by 0.17–0.56. This was because rhizodeposition activated microorganisms which produce more enzymes and increase SOM-derived substrate availability. This indicates that planted soils face higher risks of C emissions under future climate warming. Conclusions: Overall, root-soil interactions via RPE play a pivotal role in determining the temperature sensitivity of SOM decomposition.
Keywords
- C natural abundance, Phospholipid fatty acid, Rhizosphere priming effect, Soil organic carbon, Soil warming, Temperature sensitivity
ASJC Scopus subject areas
- Agricultural and Biological Sciences(all)
- Soil Science
- Agricultural and Biological Sciences(all)
- Plant Science
Sustainable Development Goals
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In: Plant and soil, Vol. 494, No. 1-2, 01.2024, p. 95-109.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Rhizosphere influence on microbial functions
T2 - consequence for temperature sensitivity of soil organic matter decomposition at early stage of plant growth
AU - Zhou, Jie
AU - Liu, Chunyan
AU - Shi, Lingling
AU - Zamanian, Kazem
N1 - Funding Information: This study was financially supported by the National Natural Science Foundation of China (42207388). The authors would like to thank Karin Schmidt for laboratory assistance and Gabriele Lehmann and Rainer Schulz from the Laboratory for Radioisotopes (LARI), University of Goettingen.
PY - 2024/1
Y1 - 2024/1
N2 - Aims: Accurate predictions of soil carbon (C) feedbacks to climate change depend on an improved understanding of temperature sensitivity (Q10) of soil organic matter (SOM) decomposition. Although rhizosphere processes play a critical role in SOM decomposition, the rhizosphere effects on Q10 and their underlying microbial mechanisms remain unclear. Methods: Natural abundance approach was used to measure the rhizosphere priming effect (RPE) of maize under two temperature regimes in a 50-day pot experiment. We further determined the impact of rhizosphere process on the Q10 of SOM decomposition. Enzymatic kinetics, microbial growth rate, as well as 13C-phospholipid fatty acid (13C-PLFA) biomarkers were identified to evaluate the responses of microbial activity. Results: Warming relative to ambient increased the plant-derived C input, stimulated microbial growth rate, and enzyme activities by 87%, 23%, and 7–18%, respectively. Consequently, warming increased the RPE of maize up to 1-folds, and further caused a larger net C loss as compared to ambient after 50 days of transplanting. Gram negative bacteria and actinobacteria were important groups controlling the RPE, which was supported by the positive correlations between RPE and the abundance of gram negative and actinobacteria. Furthermore, we concluded a literature review and the results were consistent with our case study, where the presence of roots increased the temperature sensitivity of SOM decomposition by 0.17–0.56. This was because rhizodeposition activated microorganisms which produce more enzymes and increase SOM-derived substrate availability. This indicates that planted soils face higher risks of C emissions under future climate warming. Conclusions: Overall, root-soil interactions via RPE play a pivotal role in determining the temperature sensitivity of SOM decomposition.
AB - Aims: Accurate predictions of soil carbon (C) feedbacks to climate change depend on an improved understanding of temperature sensitivity (Q10) of soil organic matter (SOM) decomposition. Although rhizosphere processes play a critical role in SOM decomposition, the rhizosphere effects on Q10 and their underlying microbial mechanisms remain unclear. Methods: Natural abundance approach was used to measure the rhizosphere priming effect (RPE) of maize under two temperature regimes in a 50-day pot experiment. We further determined the impact of rhizosphere process on the Q10 of SOM decomposition. Enzymatic kinetics, microbial growth rate, as well as 13C-phospholipid fatty acid (13C-PLFA) biomarkers were identified to evaluate the responses of microbial activity. Results: Warming relative to ambient increased the plant-derived C input, stimulated microbial growth rate, and enzyme activities by 87%, 23%, and 7–18%, respectively. Consequently, warming increased the RPE of maize up to 1-folds, and further caused a larger net C loss as compared to ambient after 50 days of transplanting. Gram negative bacteria and actinobacteria were important groups controlling the RPE, which was supported by the positive correlations between RPE and the abundance of gram negative and actinobacteria. Furthermore, we concluded a literature review and the results were consistent with our case study, where the presence of roots increased the temperature sensitivity of SOM decomposition by 0.17–0.56. This was because rhizodeposition activated microorganisms which produce more enzymes and increase SOM-derived substrate availability. This indicates that planted soils face higher risks of C emissions under future climate warming. Conclusions: Overall, root-soil interactions via RPE play a pivotal role in determining the temperature sensitivity of SOM decomposition.
KW - C natural abundance
KW - Phospholipid fatty acid
KW - Rhizosphere priming effect
KW - Soil organic carbon
KW - Soil warming
KW - Temperature sensitivity
UR - http://www.scopus.com/inward/record.url?scp=85170212795&partnerID=8YFLogxK
U2 - 10.1007/s11104-023-06258-2
DO - 10.1007/s11104-023-06258-2
M3 - Article
AN - SCOPUS:85170212795
VL - 494
SP - 95
EP - 109
JO - Plant and soil
JF - Plant and soil
SN - 0032-079X
IS - 1-2
ER -