Nitrogen deposition, depletion of base cations from soils, underestimation of dry fallouts, and climate changes have been proposed to be the main reasons for the delayed recovery from acidification.

• 导致恢复延缓的一个主要原因是低估了氮在酸化中的贡献，另外还有土壤中盐基离子的损耗、干沉降可能被低估、气候的影响等原因。