采用径流小区定位观测法测定广西桂平市金田林场马尾松工程林林地的水土及养分流失量。结果表明，挖大穴整地造林林地年平均水流失量比荒坡地的低１５２％，泥沙流失量比全垦和带状整地造林的分别低７６２％和４６７％，养分流失量依次低７５３％和４６３％。林地径流系数年度差异显著，随造林时间推移而逐年下降。林地泥沙流失量的季节分配规律与降雨量的季节分布一致，多雨季节（５～７月）的流失量大，少雨季节（１～４月和８～１２月）的流失量小 Runoff plot positioning observation method was used to measure soil and water loss and nutrient loss of Pinus massoniana plantation in Jintian Forest Farm, Guiping, Guangxi. The results showed that the annual average water loss of the site for digging large site forestation was 152% lower than the barren slope, the loss of sediment was 762% and 467% lower than that of the land reclamation and belt afforestation, respectively. The nutrient loss In turn, the amount of low 75  3% and 46  3%. Annual difference of runoff coefficient of forest was significant, which declined year by year with the time of afforestation. The seasonal distribution of sediment loss in forest is consistent with the seasonal distribution of rainfall. The loss in the rainy season (May-July) is large, and the loss in the rainy season (January-April and August-December) is small