Soil erosion and nutrients loss of Eucalyptus young forest by different kinds of afforestation and tending measures were studied to promote the scientific management of Eucalyptus plantation.[Methods] Two runoff plots in each of three afforestation-tended lands(management treatments A

B and C) and of a Eucalypt-deforested land(CK) were set up to study the characteristics of soil erosion and water loss of Eucalyptus young forest. Managemsnt A was located on a regenerated Eucalypt seedling land with basic fertilization but no topdressing after the woods and weeds were manually cut and removed. Management B was on a regenerated seedling forest land with both of basic fertilization and topdressing after of fire clearing and chemical weeding. Management C was on a sprout regenerated forest land with both of basic fertilizing and topdressing after it was artificially cleared of woods and weeds.[Results] The annual average of surface runoff

sediment erosion and the total nutrients losses of N

P

K of management B were 129.35 mm

642.52 kg/(hm2·a) and 32.923 kg/(hm2·a)

respectively

which were higher than that of A-manage by 7.93%

90.03% and 46.89%

respectively; and were higher than that of C-manage by 4.95%

70.82% and 49.17%

respectively; and also were higher than that of CK by 4.98%

109.93% and 50.95%

respectively. There were extremely significant and positive linear correlations among rainfall

the surface flow and the sediment erosion of the experiment woodlands(R=0.717~0.853).[Conclusion] Artificial interferences such as clearing land with fire

chemical weeding

frequently fertilization

and a large number of precipitation level are the main causes of heavy soil erosion and the nutrient loss of Eucalyptus young forest woodland.