Research on Benefits of Three Agroforestry Systems in Jianfengling,Hainan Island

This paper summarized the benefits of three agroforestry systems in tropical area of China. The systems are the endemic species Homalium hainanense plantation intercropping medicine plant Alpinia oxyphylla and coffee, Gmelina hainanensis plantation intercropping A. oxyphylla. The results indicated that the growth of the plantation was promoted after inter-cropped the economic plants. For contrasting with the control sites,the growth rates of tree DBH,timber volume and biomass on the inter-cropped sites were higher over 43%~134%,18%~81% and 5%~86% than those on the control sites,respectively. The net accumulation values of biomass on the inter-cropped sites were 9.53~15.23 t·hm-2·a-1,and these were 1.6~5.1 times of that on control sites. The utilizing rates to solar energy of the systems were also 1.94~5.04 times of the control sites and were up to 0.78%~1.26%. The agroforestry systems po la ssessed a high economic benefit with 18700~30400 Yuan RMB·hm-2·a-1 and were 5.26~9.82times of that of the control sites. The ratio for input and output values of the systems were higher to 12.93~14.17.