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Strong priming of soil organic matter induced by frequent input of labile carbon

矿化(土壤科学) 化学 土壤有机质 微生物种群生物学 土壤呼吸 土壤碳 有机质 生物量(生态学) 呼吸 农学 环境化学 动物科学 植物 土壤水分 生态学 生物 细菌 有机化学 遗传学
作者
Jie Zhou,Yuan Wen,Lingling Shi,Miles R. Marshall,Yakov Kuzyakov,Еvgenia Blagodatskaya,Huadong Zang
出处
期刊:Soil Biology & Biochemistry [Elsevier BV]
卷期号:152: 108069-108069 被引量:103
标识
DOI:10.1016/j.soilbio.2020.108069
摘要

Labile carbon (C) inputs to soil (e.g., litter and root exudation) can prime soil organic matter (SOM) decomposition, and strongly influence SOM dynamics. The direction and intensity of priming, as well as the net C balance in soil, depend on the amount and frequency of labile C inputs. Most recent priming studies are based on single C additions, which are not truly representative of common litter inputs or root exudation in terrestrial ecosystems. Here, we evaluated the effects of 14C-labeled glucose addition to soil in the same final amounts (360 μg C g−1) split into two temporal patterns: seldom (20% of microbial biomass every two months) and frequent addition (4% of microbial biomass every 10 days) on the dynamics of CO2 production and SOM priming over a 200-day incubation. For the first time, we combined enzyme kinetics with substrate-induced growth respiration and fungal diversity to monitor microbially mediated SOM mineralization in response to the labile C input frequency. Frequent glucose addition decreased 14C incorporation into microbial biomass and almost doubled cumulative priming compared to seldom addition, resulting in a net loss of SOM for seldom and frequent C additions of −94 and −367 μg C g−1 respectively. Larger priming loss of SOM with frequent C inputs was accompanied by increased activities of β-glucosidase, chitinase, and acid phosphatase, and by a shift in fungal community towards increased abundance of K-strategist fungal species (mainly Mortierellales sp. and Trichoderma sp.) capable of SOM mineralization. In conclusion, frequent labile C inputs (e.g., rhizodeposits in rhizosphere or litterfall in disturephere) to soil will stimulate a shift in fungal community structure and functions, resulting in intensive priming of SOM decomposition and CO2 losses.
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