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(13)C abundance, water-soluble and microbial biomass carbon as potential indicators of soil organic carbon dynamics in subtropical forests at different successional stages and subject to different nitrogen loads
Fang H. J.; Yu G. R.; Cheng S. L.; Mo J. M.; Yan J. H.; Li S. G.
Source PublicationPlant and Soil
2009
Volume320
Issue1-2
Pages243-254
Keywordn Deposition (13)c Natural Abundance Labile c Fractions Soc Turnover Successional Stages Subtropical China Atmospheric Nitrate Deposition Southern Appalachian Mountains Particle-size Fractions Simulated n Deposition Loblolly-pine Litter Decomposition Inorganic Nitrogen Temperate Forests Tropical Forest Isotope Ratios
AbstractChronic atmospheric nitrogen deposition affects the cycling of carbon (C) and nitrogen (N) in forest ecosystems, and thereby alters the stable C isotopic abundance of plant and soil. Three successional stages, disturbed, rehabilitated and mature forests were studied for their responses to different nitrogen input levels. N-addition manipulative experiments were conducted at low, medium and high N levels. To study the responses of C cycling to N addition, the C concentration and (13)C natural abundances for leaf, litter and soil were measured. Labile organic carbon fractions in mineral soils were measured to quantify the dynamics of soil organic C (SOC). Results showed that three-year continuous N addition did not significantly increase foliar C and N concentration, but decreased C/N ratio and enriched (13)C in N-rich forests. In addition, N addition significantly decreased microbial biomass C, and increased water soluble organic C in surface soils of N-rich forests. This study suggests that N addition enhances the water consumption per unit C assimilation of dominant plant species, restricts SOC turnover in N-poor forests at early and medium successional stages (thus favored SOC sequestration), and vice versa for N-rich mature forests.
Indexed BySCI
Language英语
ISSN0032-079X
Document TypeSCI/SSCI论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/24063
Collection历年回溯文献
Recommended Citation
GB/T 7714
Fang H. J.,Yu G. R.,Cheng S. L.,et al. (13)C abundance, water-soluble and microbial biomass carbon as potential indicators of soil organic carbon dynamics in subtropical forests at different successional stages and subject to different nitrogen loads. 2009.
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