岩桂人工林水土流失监测及效益评估

通过连续2年对岩桂人工林主要生长区降雨、地表径流、泥沙含量的观测和3种栽培模式水土流失的对比分析,得出了以下2个重要结论:①3年生林分与2年生林分比较,水土流失大为减少,岩桂纯林模式水土流失减少了91.81%,岩桂 白犀草模式减少水土流失为88.97%;②林草栽培模式较农耕地模式水土流失减少,岩桂纯林和岩桂 白犀草混交林模式水土流失均比未停耕农耕地有较大程度减少,2年生岩桂纯林水土流失减少35.3%,岩桂 白犀草混交林水土流失减少34%,3年生岩桂纯林水土流失减少88.11%,岩桂 白犀草混交林水土流失减少83.67%.

A Study of the Monitoring and Assessment of Soil and Water Loss in Cinnamomum petrophilum Plantation

In the paper discussions were made on the monitoring and assessment of rainfall, run-off, and sediment concentration produced in three cultivation models of Cinnnamomum petrophilum plantation. Through two years' observation, we come to two results: i) the amount of run-off decreases when the figures of 2-year stands are compared with those of 3-year stands after plantation, and ii) the amount of run-off also decreases along with different models. For example, the model of pure C. petrophlium stands shows a decrease by 91.81 percent, and the model of C. petrophlium + Trifolium repens mixed stand shows a decrease by (88.97) percent. The pure C. petrophlium stand model and C. petrophlium + Trifolium repens mixed stand model have a lower run-off than the agricultural crop model. At the stand age of 2, the amount of run-off is lowered by 35.3 percent and by 34 percent in the pure C. petrophlium stand and C. petrophlium + Trifolium repens mixed stands.