Chinese fir(Cunningharnia lanceolata),a type of subtropical fast-growing conifer tree,widely distributed in South China,and its plantation area in China is more than 7×10~6 hm~2,accounting for 24% of total area of plantation forest in China.In recent decades,the system of successive plantation of Chinese fir is widely used in the southern china for an anticipated high economic return.However,recent studies have documented that the practice of this system led to dramatic decreases in soil fertility and fores...