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Stocking rate changed the magnitude of carbon sequestration and flow within the plant-soil system of a meadow steppe ecosystem
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Stocking rate changed the magnitude of carbon sequestration and flow within the plant-soil system of a meadow steppe ecosystem
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Stocking rate changed the magnitude of carbon sequestration and flow within the plant-soil system of a meadow steppe ecosystem
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Journal Article
Stocking rate changed the magnitude of carbon sequestration and flow within the plant-soil system of a meadow steppe ecosystem
2022
Overview
Aims
Livestock grazing is one of the most common utilization methods and exerts a significant effect on the carbon allocations between the above- and belowground components of a grassland ecosystem. The major aim of this study were to evaluate the proportions of
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C allocation to various C pools of the plant-soil system of a meadow steppe ecosystem in response to changes of stocking rate.
Methods
In situ stable
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C isotope pulse labeling was conducted in a long-term grazing experiment with 4 stocking rate. Plant materials and soil samples were taken at eight occasions (0, 3, 10, 18, 31, 56 and 100 days after labeling) to analyze the decline in
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C over time, and their composition signature of
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C were analyzed by the isotope ratio mass spectrometer technique.
Results
We found a significantly greater decline in assimilated
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C of shoot and living root for the heavily grazed swards compared to other stocking rates, with the highest relocation rate of
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C into soil C pool compared to other fractions. In addition, light grazing significantly allocated
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C assimilates in the belowground pool compared to other stocking rates, especially in the live root and topsoil C-pools.
Conclusions
In this study, the effects of grazing on the carbon transfers and stocks within the plant-soil system of the meadow steppe were highly grazing pressure dependent. Plant-soil system in light stocking rate presented the highest C utilization efficiency, however, plants allocated more C to soil C pools with heavily stocking rate.
