| Agroforestry ecosystem is a traditional soil utilization and management. The pear tree-upland rice ecosystem is a jumped-up agriculture pattern. Based on a survey of field investigation, ecological economic principles were applied to analyzed the economic and ecological effects , biomass and productivity ,energy flow, material cycles, and the status of land use of the newly introduced and built pear tree-upland rice system on sloping land in three georges reservoir area in this paper. Comparing with the pear mono-cropping system, the experiment result from the newly designed pear tree-upland rice system indicated that:1. This system is one that has multi-population, multi-levels, multi-performance and multi-benefits;2. This system improved the microclimate environment and soil fertility, reduced soil and water losses and decreased the soil erosion., reducing soil and water losses and decreased the soil erosion;3. This system increased the content of Chlorophyll of pear leaves and the photosynthetic rate, and also improved the intrinsic quality of pear; Weed and pest can be significantly controlled in the system so that it could reduce or limit the application of herbicide and pesticide.4. This system could notably utilize local natural resources with the land utilization efficiency increased by 44%.5. In 2003,the output value of this system was 93060 yuan·hm-2, the net income of this system was 9560 yuan·hm-2, the output value enhanced 12.8%, the net income of this system enhanced 18.04%, the investment returning period was advanced 2 years.6. The total biomass of this system was 23637.130 kg·hm-2, was 1.76 times of that of pear mono-cropping system.Annual productivity was 15144.124 kg·hm-2·a-1, was 2.86 times of that of pear mono-cropping system. Annual output organic material was 8595.401 kg·hm-2·a-1, was 2.62 times of that of pear mono-cropping system.Annual return organic material was 7485.280 kg·hm-2·a-1, was 8.97 times of that of pear...
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