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Coupled of carbon and nitrogen mineralization in rhizosphere soils along a temperate forest altitudinal gradient
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Coupled of carbon and nitrogen mineralization in rhizosphere soils along a temperate forest altitudinal gradient
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Journal Article
Coupled of carbon and nitrogen mineralization in rhizosphere soils along a temperate forest altitudinal gradient
2024
Overview
Aims
Rhizosphere is a hotspot for soil C and N biogeochemical cycling in terrestrial ecosystems. However, the interaction between soil C and N mineralization remain poorly understood in the rhizosphere soils. This study aimed to identify interactions between soil C and N mineralization in rhizosphere soils and bulk soils at a large scale.
Methods
We used the “soil adhering to fine roots after shaking” method to collect paired rhizosphere soils and bulk soils along an altitudinal forest gradient. Soil C mineralization rates (C
min
) and net N mineralization rates (N
min
) were determined with laboratory incubation.
Results
We found a significantly positive relationship between C
min
and N
min
in the rhizosphere soils across sites, whereas C
min
was not correlated with N
min
in the bulk soils. Furthermore, soil properties, microbial biomass C (MBC) and extracellular enzyme activities showed substantial paths affecting C
min
and N
min
using structural equation model. The coupling of C
min
and N
min
in rhizosphere soils could be triggered by root-soil interactions, resulting in the higher level of MBC, total organic C of soil, total N of soil, and extracellular enzyme activities. By contrast, the decoupling of C
min
and N
min
in the bulk soils might be attributed to the lower level of MBC and extracellular enzyme activities.
Conclusions
Our results demonstrated that soil C and N mineralization coupled in the rhizosphere rather than in the bulk soils. These results suggest that the interaction between soil C and N cycling in rhizosphere are likely to differ from that in bulk soil.
