期刊
SOIL BIOLOGY & BIOCHEMISTRY
卷 170, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.soilbio.2022.108688
关键词
Grassland restoration; Amino sugars; Lignin derivates; Soil organic matter; Microbial necromass stabilization; Plant and microbial biomarkers
类别
资金
- National Natural Sciences Foundation of China [42107282, 42077072]
- CAS Light of West China Program [XAB2019B07]
- State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, CAS [SKLLQG1915]
- Government Program of Competitive Growth of Kazan Federal University
- RUDN University Strategic Academic Leadership Program
- Tyumen Oblast Government (TerrArctic project) [89-DON]
- CarboRus project [075-15-2021-610]
Grassland restoration increases soil organic carbon sequestration, with microbial contribution playing a significant role.
Grassland restoration across the world increases soil organic carbon (SOC) sequestration which is critical for global C cycling and CO2 removal from the atmosphere. However, the relative importance of plant- and microbially-derived C for SOC is still an open question for temperate grasslands. Here, amino sugars and lignin phenols were used as biomarkers to investigate the relative microbial and plant residue contribution to SOC in a 30-year (1-, 5-, 10-, 15-, 25-, 30-year) restoration chronosequence of temperate grassland. The contribution of microbially-derived C (from 4.9 to 13 g kg(-1)) to SOC was much greater than that of plant-derived C (from 1.3 to 2.3 g kg(-1)). At the early stage of restoration (<15 years), grassland soils accumulated more C in the form of plant-derived C. In contrast, grassland soils at the late stage of restoration (>15 years) accumulated more microbially-derived C, and less from plant residues. These findings highlight the dominance of microbial contribution to SOC stabilization compared with plant residues. The contribution of bacteria-derived C to SOC gradually increased from 29% to 50% with progress of grassland restoration, while the contribution of fungal C to SOC decreased from 30% to 21%. Consequently, microbial residue contribution to SOC shifts from fungal and bacterial to mainly bacterial residues during grassland restoration. This shift may be due to the faster bacterial growth and a increasing living biomass during grassland restoration, leading to higher accumulation of bacterial residues. Correlation analysis and random forest models showed that belowground plant biomass, soil pH, and living microbial biomass were the main factors regulating plant-derived C. The microbially-derived C in SOC, however, was dependent on living microbial biomass, soil pH and dissolved organic C. Concluding, grassland restoration increased soil C sequestration primarily by microbial necromass (mainly bacterial necromass), and is affected by abiotic and biotic factors, as well as plant C input.
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