补播紫花苜蓿对天山北坡退化山地草甸草原群落的影响

为了了解补播改良对天山北坡山地草甸草原植物群落的影响，采用补播、监测和室内分析相结合的方法，揭示补播改良3年后草地群落三度一量、养分含量和草场质量的变化情况，结果显示：（1）补播区与对照区相比，密度高出54株/m2，草地群落覆盖度高出30%，草地生物量是对照区的3.67倍。（2）补播紫花苜蓿对草地群落养分含量提高明显，尤其是粗蛋白质，比对照区高出3.23个百分点，而对粗脂肪、钙、总磷、粗灰分也均有改善。（3）草地质量从中等提高到优等，质量提高了2个等级。说明补播紫花苜蓿对修复退化山地草甸草原效果显著。

Effects of Reseeding Alfalfa Against Community of Degraded Mountain Meadow Steppe in Northern Tianshan Mountain

To learn the effects of reseeding Alfalfa against the community of degraded mountain meadow steppe in northern Tianshan Mountain, the changes of three degrees and one amount, nutrient content and grassland quality of grassland community three years later after reseeding are illuminated by the means of combination of reseeding, monitoring and lab analysis, it is found that: (1) compared to the contrast area, the density of the reseeding area is 54 plants/ m2 higher , the coverage rate of grassland community is 30% higher and the grassland biomass is 3.67 times larger;(2) the reseeding Alfalfa can obviously improve the nutrient content of the community as well as crude fat, crude ash, calcium and phosphorus, especially the crude protein is 3.23%higher than the contrast area;(3) the grassland quality is improved by two grades from medium to high-class. Therefore, the reseeding Alfalfa can greatly help for repairing degraded mountain meadow steppe.