“土壤侵蚀”常见的英文表达是 soil erosion。
例句：
Deforestation has led to serious soil erosion in this area.（森林砍伐导致了这个地区严重的土壤侵蚀。）
Measures should be taken to prevent soil erosion and protect the ecological environment.（应该采取措施防止土壤侵蚀，保护生态环境。）