容许土壤流失量 根据保持土壤资源及其生产能力而确定的年土壤流失量上限，通常小于或等于成土速率。对于坡耕地，是指维持土壤肥力，保持作物在长时期内能经济、持续、稳定地获得高产所容许的年最大土壤流失量。
“允许土壤流失量”的概念在全球，包括在中国得到了广泛的应用。
The concept of soil loss tolerance has been widely used over the world as well as in China.
不同区域的水土流失对水质的影响是有差异的，其土壤允许流失量是有区别的。
Water and soil loss in different area has different effect on water quality, and its soil loss tolerance is also different.
喀斯特区由于土层薄、土壤允许流失量低，生态系统十分脆弱，植被破坏后难以恢复。
Because of thin solum and lower soil loss tolerance, the ecosystem in Karst region is very fragile. The vegetation is difficult to recover after destruction.
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