Abstract: In order to study the damage of long-wave ultraviolet (UVA) on Bufo raddei kidney, three groups of Bufo raddeisjuveniles were irradiated continuously by 365 nm UVA with a dosage of 352 μW·cm^-2 for 150, 300, and 450 min, respectively, and the kidney after the irradiation was dissected immediately and 3, 6, 9, 12, and 15 days later, with its histological changes observed by general histological method. After the UVA radiation, the kidney structure was basically in integrity, except the fracture and visible constriction of renal tubule and the disappearance of renal capsule, which were most obvious in the 300 min group, followed by in 450 min group and in 150 min group. The damage to Malpigkian bodies was more serious in 300 and 450 min groups than in 150 min group. After 15 days recovery, though the damage was somewhat mitigated, most of the histological indices of the three experimental groups were significantly different from the control group. This study showed that the damage of UVA to B. raddei kidney could not be ignored in spite of the kidney’s self-repair capability. In the field, the enhancement of UV radiation and the reduction of vegetation could cause amphibians suffering excessive UV radiation, and even, amphibian population decline.

Key words: Loess Plateau, soil aggregate, soil organic carbon, enzyme activity, vegetation zone.