Benefit Evaluation On Mixed Planting Of Young Camellia Oleifera And Camphor

The objective of this thesis is to evaluate and compare the survival rates, growth, as well as the economic and ecological benefits of three cultivation modes of young Camellia oleifera forest through a four-year survey and scientific calculation of the survival rates, the growth, and the oil production rates. The results are as followed:(1) Among the three cultivation modes of the young Camellia oleifera forest, the survival rate in a decreasing order is:the rate with a 2:1 mixing ratio of Camellia oleifera and Cinnamomum camphora (L.) Presl (mode 2)> the rate with a 1:1 mixing ratio of Camellia oleifera and Cinnamomum camphora (L.)Presl (mode 1)> the rate of the pure Camellia oleifera forest (mode 3). This may be due to the crown of Cinnamomum camphora (L.) Presl, which can shadow the Camellia oleifera seedlings and reduce moisture evaporation, and thus can improve the survival rate of Camellia oleifera seedlings.(2) Among the three cultivation modes of the young Camellia oleifera forest, the growth factors (tree height, DBH and crown) of Camellia oleifera in a decreasing order is:the factors with a 2:1 mixing ratio of Camellia oleifera and Cinnamomum camphora (L.) Presl (mode 2)> the factors with a 1:1 mixing ratio of Camellia oleifera and Cinnamomum camphora (L.)Presl (mode 1)> the factors of the pure Camellia oleifera forest (mode 3)..(3) Among the three cultivation modes of the young Camellia oleiferaforest, the economic benefits in a decreasing order is:the benefit with a 1:1 mixing ratio of Camellia oleifera andCinnamomum camphora (L.) Presl (mode 1)> the benifet with a 2:1 mixing ratio of Camellia oleifera and Cinnamomum camphora (L.) Presl (mode 2)> the benefit of the pure Camellia oleifera forest (mode 3). The main economic investment for the three standard fields includes the costs of seedlings, weedkilling, fertilizers, labor and freight. The economic output mainly includes the economic values of Camellia oleifera and Cinnamomum camphora (L.) Presl, and the economic values are increasing year by year. Comprehensive analysis of the three cultivation modes reveals that mode 1 produced the greatest economic benefit, while the growth of tea oil production and the average tea oil production per tree were least; model 2 produced the second greatest economic benefit, but the growth of tea oil production and the average tea oil production per tree were greatest; model 3 produced the least economic benefit, and the growth of tea oil production ranked second.(4) Among the three cultivation modes of the young Camellia oleifera forest, the ecological benefits in a decreasing order is:the benefit with a 2:1 mixing ratio of Camellia oleifera and Cinnamomum camphora (L.) Presl (mode 2)> the benefit with a 1:1 mixing ratio of Camellia oleifera and Cinnamomum camphora (L.) Presl (mode 1)> the benife of the pure Camellia oleifera forest (mode 3). The cultivation mode of the ecological benefits remained stable every year. In general, the mixing ratio of Camellia oleifera and Cinnamomum camphora (L.) Presl of 2:1 produced the greatest ecological benefit and exhibited the maximum ecological benefit of a forest.By comprehensive analysis and comparison of the survival rates, the growth, and the economic and ecological benefits, mode 2 with a 2:1 mixing ratio of Camellia oleifera and Cinnamomum camphora (L.) Presl is the best and most recommendable mixing afforestation technique among the three cultivation modes evaluated.