translate English to French: Progressive leaching of base cations (Ca2+, Mg2+, K+, Na+) from soils causes soil acidification (replacement of base cations on soil exchange sites with H+ and Al3+) which can eventually lead to the drainage of acidified soil solutions into surface waters.
Le lessivage progressif des cations basiques (Ca2+, Mg2+, K+, Na+) des sols cause l'acidification de ces derniers (H + et Al3 + remplacent les cations basiques sur les sites d'Ã©changes). Les solutions de sol devenues acides se drainent dans les eaux de surface (lacs et cours d'eau).