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The decomposition of organic carbon in rhizospheric soil is more sensitive to global warming than non-rhizospheric carbon

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The rhizosphere is the narrow region where plant roots and soil interact vigorously and where intensive microbial metabolism occurs. The properties of rhizospheric soil are generally different from those of non-rhizospheric soil. This is called rhizosphere (RE) effects.

The decomposition of rhizospheric soil organic carbon (SOC) plays an important role in the carbon cycle in forest ecosystems. However, how the decomposition of rhizospheric SOC responds to simulated global warming is rarely understood.

A research team led by Professor Wang Qingkui of the Institute of Applied Ecology (IAE) of the Chinese Academy of Sciences recently conducted a laboratory incubation experiment to examine the effects on the rhizosphere of Cunninghamia lanceolata (c (i.e. Chinese fir) and its understory ferns on the temperature sensitivity (expressed as Q10) of COS decomposition.

The researchers found that all plant species tested had positive effects on the rhizosphere on Q10 from COS decomposition. And the positive REs on Q10 could be attributed to the high availability of nitrogen in the rhizosphere and high microbial activity (i.e. positive REs on nitrogen components, microbial biomass and microbial residues) .

This study shows that the decomposition of organic carbon in rhizospheric soil is more sensitive to global warming than the decomposition of COS in bulk soil, which highlights the need to discriminate between rhizospheric and non-rhizospheric soil when predicting feedback from COS pool in the future. climate changes.

The study, titled “Cunninghamia lanceolataand understory ferns had positive effects on the rhizosphere on temperature sensitivity of soil microbial respiration in a subtropical forest”, was published in Geodermy.


The priming effect caused by root litter varies according to the order of the roots


More information:
Xuechao Zhao et al, Cunninghamia lanceolata and understory ferns had positive effects on the rhizosphere on the temperature sensitivity of soil microbial respiration in a subtropical forest, Geodermy (2021). DOI: 10.1016 / j.geoderma.2021.115593

Provided by Chinese Academy of Sciences

Quote: Decomposition of organic carbon in rhizospheric soil is more sensitive to global warming than non-rhizospheric carbon (2021, December 1) retrieved on December 1, 2021 from https://phys.org/news/2021-12-decomposition-rhizospheric- soil-carbon -sensible.html

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