Converting natural evergreen broadleaf forests to intensively managed moso bamboo plantations affects the pool size and stability of soil organic carbon and enzyme activities

摘要: Land-use change significantly affects the soil organic C (SOC) dynamics and microbial activities. However, roles of chemical composition SOC enzyme activity in mineralization rate caused by land-use are poorly understood. This study aimed to investigate impact conversion from natural evergreen broadleaf forests intensively managed moso bamboo (Phyllostachys edulis) plantations on pool size SOC, as well activities C-cycling enzymes (invertase, β-glucosidase, cellobiohydrolase) dehydrogenase. Four paired samples two layers (0–20 20–40 cm) were taken adjacent forest-moso plantation sites Lin’an County, Zhejiang Province, China. Soil water-soluble (WSOC), hot-water-soluble (HWSOC), biomass (MBC), readily oxidizable (ROC), dehydrogenase, rates measured. The was also determined with 13C-nuclear magnetic resonance spectroscopy. reduced stock WSOC, HWOC, MBC, ROC concentrations (P < 0.05), decreased O-alkyl, aromatic, carbonyl contents, but increased alkyl content O-alkyl (A/O-A) ratio, suggesting that altered structure SOC. Further, such lowered (P < 0.05) four 0–20-cm soil. associated closely linked labile concentration results demonstrate converting markedly total stocks reveal this via changing decreasing enzymes. Management practices enhance input into recommended mitigate depletion plantations.