Unexpected no significant soil carbon losses in the Tibetan grasslands due to rodent bioturbation

The Tibetan grasslands store 2.5% of the Earth's soil organic carbon. Unsound management practices and climate change have resulted in widespread grassland degradation, providing open habitats for rodent activities. Rodent bioturbation loosens topsoil, reduces productivity, changes soil nutrien...

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Published in:PNAS nexus 2023-03, Vol.2 (3), p.pgac314-pgac314
Main Authors: Huang, Miao, Gan, Dezhao, Li, Zheng, Wang, Jinsong, Niu, Shuli, Zuo, Hongchao, Long, Ruijun, Ma, Lei
Format: Article
Language:English
Subjects:
Analysis
Bioturbation
Carbon content
Environmental aspects
Global temperature changes
Grasslands
Physical Sciences and Engineering
Rodents
Soil structure
Soils
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container_title PNAS nexus
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creator Huang, Miao
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description The Tibetan grasslands store 2.5% of the Earth's soil organic carbon. Unsound management practices and climate change have resulted in widespread grassland degradation, providing open habitats for rodent activities. Rodent bioturbation loosens topsoil, reduces productivity, changes soil nutrient conditions, and consequently influences the soil organic carbon stocks of the Tibetan grasslands. However, these effects have not been quantified. Here, using meta-analysis and upscaling approaches, we found that rodent bioturbation impacts on the Tibetan grassland soil organic carbon contents were depth-dependent, with significant (  
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Unsound management practices and climate change have resulted in widespread grassland degradation, providing open habitats for rodent activities. Rodent bioturbation loosens topsoil, reduces productivity, changes soil nutrient conditions, and consequently influences the soil organic carbon stocks of the Tibetan grasslands. However, these effects have not been quantified. Here, using meta-analysis and upscaling approaches, we found that rodent bioturbation impacts on the Tibetan grassland soil organic carbon contents were depth-dependent, with significant (  &lt; 0.001) decreasing of 24.4% in the topsoil (0 to 10 cm) but significant (  &lt; 0.05) increasing of 35.9% in the deeper soil layer (40 to 50 cm), and nonsignificant changes in other soil layers. The depth-dependent responses in soil organic carbon content were closely associated with rodent tunnel burrowing, foraging, excrement deposition, and mixing of the upper and deeper soil layers. Rodent bioturbation had shown nonsignificant impacts on soil bulk density, independent of soil layer. Tibetan grasslands totally lose -35.2 Tg C yr (95% CI: -48.5 to -21.1 Tg C yr ) and -32.9 Tg C yr (-54.2 to -8.6 Tg C yr ) due to rodent bioturbation in the 0 to 10 or 0 to 30 cm soil layer, while no significant net loss was found over the 0 to 90 cm layer. 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subjects Analysis
Bioturbation
Carbon content
Environmental aspects
Global temperature changes
Grasslands
Physical Sciences and Engineering
Rodents
Soil structure
Soils
title Unexpected no significant soil carbon losses in the Tibetan grasslands due to rodent bioturbation
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