水库库区桉树轮伐对水土流失的影响研究——以广州水库库区为例

以广州市白洞水库和吊钟水库作为实验样区,研究分析水库库区桉树轮伐对水土流失的影响.研究基于遥感数据对库区桉树轮伐区的植被覆盖度、土壤侵蚀模数以及水土保持作用系数进行反演和统计分析.结果显示:库区桉树林的轮伐行为将导致植被覆盖度从0.8~0.9下降到0.2~0.3;土壤侵蚀模数从2 000~3 000 t/km2上升到8 000~13 000 t/km2,水土保持作用系数从0.7~0.8下降到0.3~0.5;扰动期长达11个月;产生较严重的水土流失影响.

Effects of Reservoir Area on Soil Erosion in a Eucalyptus Rotation: A Case Study in Two Reservoirs of Guangzhou

The soil erosion leaded by the eucalyptus forest rotation behavior in two reservoirs of Guangzhou is studied. The vegetation coverage is interpreted by using remote sensing information in reservoir area of eucalyptus forest. The soil erosion modulus, as well as water and soil conservation effect coefficient is also calculated through vegetation coverage. The experimental result shows that the eucalyptus forest rotation behavior leads to vegetation coverage decreasing from 0.8~0.9 to 0.2~0.3, soil erosion modulus up from 2000~3000 t/km2 to 7000 ~ 14000 t/km2, water and soil conservation effect coefficient decreasing from 0.7~0.8 to 0.3 ~ 0.5. The disturbance period lasts for 11 months causing serious soil erosion problem.