Resistant soil organic carbon is more vulnerable to priming by root exudate fractions than relatively active soil organic carbon

文献类型： 外文期刊

第一作者： Zhou, Shuang

作者： Zhou, Shuang;Lin, Junjie;Wang, Peng;Zhu, Ping;Zhu, Biao

作者机构：

关键词： Priming effect; Root exudates; Soil carbon fractions; Net carbon balance; Abiotic destabilization

期刊名称：PLANT AND SOIL （ 影响因子：4.993； 五年影响因子：5.44 ）

ISSN： 0032-079X

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收录情况： SCI

摘要： Aims This study aimed to explore the mechanisms of the priming effect (PE) induced by root exudates on soil carbon pools at different stages of decomposition. Methods The (13) C-labeled and unlabeled glucose, glycine and oxalic acid were added to soils of 15-year old-field (OF), 15-year bare-fallow (BF) and 23-year bare-fallow plus additional 815-day laboratory incubation (BF+), which represented relatively active (OF) and more resistant (BF and BF+) soil carbon pools. The (13) C stable isotope was used to determine the PE and net carbon balance, and cumulative CO2 emission, microbial biomass carbon and dissolved organic carbon were also reported. Results Relative to the control, soil organic carbon (SOC) decomposition in OF, BF and BF+ was stimulated by 17.3%, 20.8% and 21.5% with glucose addition, by 12.0%, 36.9% and 52.6% with glycine addition, and by 20.8%, 58.4% and 62.8% with oxalic acid addition, respectively. Overall, oxalic acid resulted in higher cumulative PE and lower net carbon balance relative to glucose and glycine in all three soils. Moreover, the PE of BF and BF+ were larger than that of OF induced by glucose, glycine and oxalic acid. Conclusions Resistant soil carbon is more vulnerable to priming by root exudates compared to active soil carbon, and oxalic acid can induce a stronger PE than glucose and glycine, especially in more resistant soil carbon pools.

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