Analysis of Soil Fertility and Bioactivity in Eucalyptus and Cunninghamia lanceolata Mixed Forest with Different Mixed Proportion
The differences of soil fertility and bioactivity were analysed by using the data obtained from the 12-year-old Eucalyptus and Cunninghamia lanceolata mixed forest with different mixed proportion. The results showed that the difference of soil fertility and bioactivity depended on the mixed proportion of Eucalyptus and Cunninghamia lanceolata. And the proportion of the Eucalyptus is higher, the difference is more significant, which means the mixed proportion influences various factors of fertility directly. The maximum water retaining capacity and available nutrients of soil increased as the proportion of the Eucalyptus increased, whereas bulk density and total acidity of soil decreased with the increasing of the proportion of Eucalyptus. Moreover, the ratio of soil aggregate, structure damage and micro-aggregate among different mixed forests were significant, relative significant and very significant, respectively. Finally, soil bioactivity strengthened in accordance with the rise of proportion of Eucalyptus, which formed a given gradient. In summation, the Eucalyptus and Cunninghamia lanceolata mixed forest played an irreplaceable role in soil fertility and bioactivity, which included the improvement of soil structure, permeability, water storage and retaining capacity, increase of soil water-stable aggregate content, improvement of soil microbial physiological groups, enhance of soil bioactivity, promotion of soil nutrients return and cycling rate and so on. Therefore, it was an optimal mixed forest when the ratio of the Eucalyptus and Cunninghamia lanceolata was three to one.
Eucalyptus grandis x E. UrophyllaCunninghamia lanceolatamixed forestsoil fertilityenzyme activitydifference
国家科技期刊平台
NSTL
万方数据
维普
