杉木细柄阿丁枫混交林根际土壤的研究

Studies on Rhizospheric Soil in Mixed Forest of Chinese Fir, Altingia gracilipes

通过对细柄阿丁枫和杉木纯林根际土、全土及混交林全土的研究结果表明：两树种均具有明显根际效应，但细柄阿丁枫的根际效应比杉木的大；根际土有机质、全氮、土壤微生物组成和区系及土壤酶活性均比全土大，但速效性氮、磷、钾则比全土小；与杉木纯林相比，混交林土壤生物学活性得到一定程度的改善，混交林中杉木平均树高和胸径分别是杉木纯林的1.16倍和1．20倍，混交林林分总蓄积比杉木纯林增加19．99％．

The results, studied biological activities of rhizospheric soil in Chinese fir, Altingia gracilipes, and all soil in pure stands of Chinese fir, Altingia gracilipes and mixed stands showed that, there were rhizospheric effect evidently in two trees. The rhizospheric effect of Altingia gracilipes was higher than that of Chinese fir. Organic matter, total N, microbes and enzyme actives of rhizospheric soil wrer higher than that of all soil,although available N, P, K of rhizospheric soil were lower than that of all soil. In contrast to the pure stands of Chinese fir,the biological activities of mixed stands have shown some improvement. The average height and diameter of Chinese fir in mixed stands were 1' 16 times and l' 20 times as high as pure stands of Chinese fir.Total volumes of mixed stands was 19. 99% higher than that of pure stands of Chinese fir.