Abstract: The heartwood and bark of Maackia amurensis Rupr.et.Maxim. were used as raw material to obtain 10 kinds of extracts by extracting with ether, chloroform, acetone, methanol and water,respectively. Antibacterial activities against Coriolus versicolor and Gloeophyllum trabeum of 10 kinds of extracts were studied, It was found that methanol and acetone extracts of heartwood have good antibacterial activities. Wood preservation activities of methanol extract of heartwood was also compared with the wood preservative acid copper chromate(ACC) in lab. Weight loss and scanning electron microscopy (SEM) photography showed that methanol extract of heartwood has better decay resistance against C. versicolo, weaker decay resistance against G. trabeum,but ACC has better decay resistance against two epiphytes. The acute toxicities of methanol extract of heartwood and ACC to Brachydanio rerio were studied. At 24,48 and 72 h, LC₅₀ of methanol extract were 16.5, 12.7, 12.0 mg/L respectively, LC₅₀ of ACC were 3.2, 2.5, 2.0 mg/L respectively. The safety concentrations of methanol extract and ACC are 2.26 and 0.46 mg/L respectively.

Key words: Maackia amurensis Rupr.et.Maxim., wood preservation, acute toxicity