锡林浩特市天然大针茅草原产草量及营养动态分析

Dynamic Analyses of Grass Yield and Nutrition of Natural Stipa grandis grassland in Xilinhot

为确定锡林浩特市天然大针茅草原最适收获期,获取质量兼优的天然牧草,采用样方法对大针茅(Sti pa grandis)不同生育期产草量及营养成分进行测定分析。结果表明:混合牧草成熟期干草产量最高,孕穗期粗蛋白质含量和相对饲用价值最高。综合考虑干草产量、营养物质含量及相对饲用价值变化动态,天然大针茅草原的最佳收获期为抽穗—开花期。

The grass yield and nutrition content of Stipa grandis were measured in different growth periods in order to determine the optimal harvest time of Xilinhot natural Stipa grandis grassland for the excellent quality of natural grass.The results showed that the hay yield of mixed grass in mature stage was the highest compared to other stages.The relative feed value and crude protein content of mixed grass were the highest in booting stage.Therefore,comprehensive considering the dynamic changes of hay yield,nutrient content and relative feed value indicates that the optimal harvest time of natural Stipa grandis grassland is heading-flowering stage.