A Study on the Influence of Site Management Measures on the Growth of 3 year old Cunninghamia lanceolata Plantation of Second generation

Aimed at studying the influence of various patterns of site management on the productivity of Cunninghamia lanceolata plantation for generations, the second generation C.lanceolata plantation was established with 5 kinds of site preparation patterns on the cleared area of first generation C.lanceolata.The results showed that:(1)The Pattern of Stem and Bark Harvesting+Double Slash had the most benefits to the growth of 3 yeat old C.lanceolata of second generation,and had the most effects on reducing soil bulk specific gravity and raising soil pH value.This is the best site management pattern followed by the Pattern of No Slash.(2)The Pattern of Whole tree Harvesting was the worst.(3)The Pattern of Stem and Bark Harvesting+Burning was better compared with the Pattern of Commercial Harvesting on the growth of C.lanceolata, but the effect was not significant.(4)The difference between Pattern of Stem and Bark Harvestimg+Burning and the Pattern of Stem+Bark Harvesting was significant in total biomass of individual tree.But the difference of growth indexes among various treatment patterns was not signigicant.