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Research and Evaluation on the Surface Runoff Characteristics of Young Eucalyptus grandis × E.urophylla Forest Land in the Low Hilly District of Subtropical Zone

[Objective] The study aimed to reveal the surface runoff characteristic for forest land in young Eucalyptus grandis × E.urophylla grown in the different environment.[Method] Through select different regeneration patterns of young E.grandis × E.urophylla forest to set up runoff plot in the low hilly district of Qinzhou in Guangxi Province and the location contrast and monitoring research was conducted on the amount of soil loss as well as nutrient loss.[Result] The annual surface rainfall amount of different vegetation types were:shrub-herb forest(215.930 mm) sprouted forest(168.499 mm) seedling forest(122.455 mm) and the seasonal variation of the rainfall amount were:summer(395.043 mm) spring(96.343 mm) autumn(19.452 mm) winter(0 mm),which was identical with the seasonal distribution of precipitation in this region.The amount of soil erosion of different vegetation types were as follows: seedling forest(7.220 kg/hm2) shrub-herb forest(6.345 kg/hm2) sprouted forest(6.285 kg/hm2) and the amount of soil erosion mainly lied on rainfall intensity.The amount of soil nutrients loss were:seedling forest(0.095 5 kg/hm2) shrub-herb forest(0.084 0 kg/hm2) sprouted forest(0.083 0 kg/hm2),which coincided with the law of the amount of soil erosion and the soil nutrient showed as K N P.[Conclusion] The surface rainfall amount of young forest with different vegetation types had significant difference in this region and their soil nutrients loss amount was also differentiated.