杉木根桩和周围土壤酚含量的变化及其化感效应

研究了杉木根桩在分解过程中酚类物质的释放规律及其化感效应.结果表明,随着分解程度的加深,根桩中酚类物质的含量减少.根桩中酚类物质含量的梯度为根系>心桩>边桩;根桩在分解过程中酚类物质向外释放并会在土壤中积累,根桩周围土壤中酚类物质含量高于非根桩周围土壤.盆栽试验说明酚类物质会影响杉木种子的萌芽率.将田间调查的杉木树高、地径与根桩密度进行相关分析证明杉木根桩保留在造林地上,不利于下一代杉木的生长.建议改革杉木人工林的传统作业方式,造林前将根桩从造林地中清除.

Dynamics of phenolics content of Chinese fir stump-roots and the rhizosphere soil and it's allelopathy

Studies on the releasing pattern of phenolics during the decomposition of Chinese fir stump root and on its allelopathy show that the phenolics contents in stump roots decreased with their decomposition.Roots had a higher content of phenolics than heart stumps,and edge stumps had the least.The phenolics was released during decomposition,and accumulated in the soils around stump roots.Pot culture experiment showed that phenolics affected the germination of Chinese fir seeds.The correlation analysis between the density of Chinese fir stump-root and the tree height and base diameter (BD) of its saplings proved that Chinese fir stump-roots had a negative impact on the growth of the next generation of Chinese fir plantations.It is suggested that the traditional operation of Chinese fir plantations should be reformed,and the stump roots should be cleared from woodland before reforestation.