关键词: 竹林, 放牧, 农用林, 模拟模型

Abstract: Bamboo forests are widely distributed in the subtropics of China. Agroforestry systems have been recommended, e.g. raising cattle in bamboo stands, to enhance the economic return. A Bamboo-Cattle-Grass agroforestry system has been designed to explore the feasibility of that kind of systems.Data were collected from the experiments conducted in Dagangshan, Jiangxi province, and a simulation model was developed. Productivity, cost,economic return, impacts of crown density on undergrowth, impacts of cattle on volume weight of soils etc.and feedback loops among them were taken into consideration in the model. Seven scenarios are set up based on cut-age of bamboo stands. The results show that as the crown density becomes lower the economic return grows up, but a disastrous ecological impact follows.The soil is compacted by cattle and low carrying capacity and serious land degradation will happen.Introduction of quality grass species and cage-feeding method can much improve the productivity of grass and soil conditions,but the economic return is not high. Neither grazing under canopy norcagefeeding of cattle favoures the improvement of economics of bamboo regions.If appropriate techneques and markets are available meat-targeted ormilktargeted cattle in cage-feeding may be profitable. However, these conditions are generally not available in the present bamboo regions. The later policy may have hopeful perspectives. A successful evaluation needs a futhersocial-economic-production model.

Key words: Bamboo, Grazing, Agroforestry, Simulation Model