Linkage of microbial living communities and residues to soil organic carbon accumulation along a forest restoration gradient in southern China

Forest Ecosystems

Ying-Ping Wang¹  Ji Chen²  Xi Fang³  Jinlei Chen³  Hongbo He⁴  Mengxiao Yu⁵  Junhua Yan⁵  Qi Deng⁵  Pingping Xu⁶  Shenhua Wang⁶  Shuo Zhang⁷ 

[1] CSIRO Oceans and Atmosphere, PMB 1, 3195, Aspendale, Victoria, Australia;Department of Agroecology, Aarhus University, 8830, Tjele, Denmark;Aarhus University Centre for Circular Bioeconomy, Aarhus University, 8830, Tjele, Denmark;iCLIMATE Interdisciplinary Centre for Climate Change, Aarhus University, 4000, Roskilde, Denmark;Faculty of Life Science and Technology, Central South University of Forestry and Technology, 410004, Changsha, China;Institute of Applied Ecology, Chinese Academy of Sciences, 110016, Shenyang, China;Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, 510650, Guangzhou, China;Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, 510650, Guangzhou, China;University of Chinese Academy of Sciences, 100049, Beijing, China;Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, 510650, Guangzhou, China;University of Chinese Academy of Sciences, 100049, Beijing, China;Department of Agroecology, Aarhus University, 8830, Tjele, Denmark;

关键词: Soil carbon stock;    Microbial biomass;    Microbial residues;    Forest restoration;    Soil clay content;    Soil layer;   

DOI  :  10.1186/s40663-021-00334-8

来源: Springer

【 摘 要 】

BackgroundForest restoration has been considered an effective method to increase soil organic carbon (SOC), whereas it remains unclear whether long-term forest restoration will continuously increase SOC. Such large uncertainties may be mainly due to the limited knowledge on how soil microorganisms will contribute to SOC accumulation over time.MethodsWe simultaneously documented SOC, total phospholipid fatty acids (PLFAs), and amino sugars (AS) content across a forest restoration gradient with average stand ages of 14, 49, 70, and > 90 years in southern China.ResultsThe SOC and AS continuously increased with stand age. The ratio of fungal PLFAs to bacterial PLFAs showed no change with stand age, while the ratio of fungal AS to bacterial AS significantly increased. The total microbial residue-carbon (AS-C) accounted for 0.95–1.66 % in SOC across all forest restoration stages, with significantly higher in fungal residue-C (0.68–1.19 %) than bacterial residue-C (0.05–0.11 %). Furthermore, the contribution of total AS-C to SOC was positively correlated with clay content at 0–10 cm soil layer but negatively related to clay content at 10–20 cm soil layer.ConclusionsThese findings highlight the significant contribution of AS-C to SOC accumulation along forest restoration stages, with divergent contributions from fungal residues and bacterial residues. Soil clay content with stand age significantly affects the divergent contributions of AS-C to SOC at two different soil layers.

【 授权许可】

CC BY