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在柴达木盆地退化弃耕地上用紫花苜蓿建立人工草地恢复植被效果良好 ,二龄紫花苜蓿地上生物量及群落地上生物量季节变化呈“S”型曲线 ,其高峰期在 8月底。紫花苜蓿、野生杂类草和群落生物量生长速率季节动态不尽相同 ,紫花苜蓿种群和群落生物量生长速率的最大值在 7～ 8月份 ,野生杂类草最大值在 6～ 7月份。播种当年采用紫花苜蓿 +燕麦混播处理不仅可提高紫花苜蓿新生苗的存活率和越冬率 ,而且使第 2年返青出苗整齐 ,地上生物量较单播提高 3 1.82 % ,还可增加当年收益
The restoration of artificial grassland with alfalfa on degenerated abandoned farmland in Qaidam Basin had a good effect. The seasonal variation of aboveground biomass and aboveground biomass of alfalfa was “S” curve at the end of August. The seasonal dynamics of alfalfa, wild miscellaneous grass and community biomass growth rate were different. The maximum growth rate of alfalfa population and community biomass was from July to August, and the maximum value of wild mixed grass was from June to July. In the year of sowing, alfalfa + oat mixed-sowing could not only improve the survival rate and overwintering rate of alfalfa seedlings, but also increase the seedling emergence rate in the second year with the increase of aboveground biomass by 3.18%