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

Yang Yusheng; Lin Dexi(Department of Resouces & Enviroment, Fujian College of FOrestry, Nanping 353001)Li Zhenwen; Ruan Chuancheng(Youxi Research Institute of Forestry, Fujian Province 365100)  
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.
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