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.
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