N-fixing tree species promote the chemical stability of soil organic carbon in subtropical plantations through increasing the relative contribution of plant-derived lipids

• DOI: 10.1016/j.fecs.2024.100232
• Publication Date: 2024-08-03T01:22:58Z
• Authors: Xiaodan Ye; Junwei Luan; Hui Wang; Yu Zhang; Yi Wang; Shirong Liu
• Keywords: Soil carbon; Carbon fibers; Tree (set theory)

Biodiversity experiments have shown that soil organic carbon (SOC) is not only a function of plant diversity, but also closely related to the nitrogen(N)-fixing plants. However, effect N-fixing trees on SOC chemical stability still little known, especially with compounding effects tree species diversity. An experimental field manipulation was established in subtropical plantations southern China explore impacts richness (i.e., one, two, four and six species) with/without stability, as indicated by ratio easily oxidized (EOC/SOC). Plant-derived C components terms hydrolysable lipids lignin phenols were isolated from soils for evaluating their relative contributions stability. The results showed rather than had significant EOC/SOC. Hydrolysable negatively correlated EOC/SOC, while contributed more EOC/SOC phenols, occurrence trees. presence led an increase N availability decrease fungal abundance, promoting selective retention certain key lipids, thus enhancing These findings underpin crucial role shaping therefore, preferential selection mixed appropriate silvicultural strategy improve plantations.