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中文摘要：
在三江源区高寒草甸草场进行施肥试验,以确定不同施肥时期、不同施肥量对天然草地牧草产量（干重）的影响。结果表明：施肥可大幅度提高牧草产量,且因施肥量及施肥时期的不同,牧草产量差异大。施肥时间和施肥量间存在着交互作用,两者共同作用于牧草产量。由两年的数据可知,随着施肥时间的逐渐后移,氮肥对牧草的增产作用逐步降低,牧草产量（干重）呈下降趋势;3个不同施肥量处理的牧草产量分别比不施肥的增加138.65%、161.72%和122.51%,施肥量在0~450kg/hm2区间内,牧草产量变化呈抛物线型。通过综合比较分析,三江源区高寒草甸最佳施肥时间是6月10~25日间,最佳施肥量（尿素）为150~300kg/hm2具有较高的牧草产量和低施肥成本。
英文摘要：
The fertilization experiment in Alpine meadow of region of three-river source was conducted to detemine the effect of different time and different amount of fertilization on the dry pasturage yeld of the natural pasture.The results showed that fertilization could be significantly improved the yield of pasturage.The pasturage yield changed along with different amount and different time of fertilization and there was the interaction between the time and amount of fertilization in the effect of them on the pasturage yield.With fertilization time delay gradually,the role of nitrogen fertilizer on the increase production decreased uccording to the experiment data and there was decrease tend in the dry pasturage yield.The dry pasturage yield in the pasture treated with three different amount of fertilization increased by 138.65%,161.72% and 122.51% than that in the pasture of non-fertilization,resp.The change of the pasturage yield showed the parabola type betueen 0 and 450kg/hm2 in the amount of fertilization.The optimum time of fertilization was between 10 and 25 June and the optimum amount of fertilizatiou（urea） was between 150 and 300kg/hm2,which obtained higher pasturage yield and lower fertilization cost on the compare and analysis in the region of three-river source.
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