中文摘要：

【目的】探讨草甸草原区16个不同植物群落天然牧草青贮效果及可行性。【方法】以草甸草原区16个站点牧草为试验材料,将鲜草切短装入聚乙烯袋中,然后用真空包装机抽真空并封口,贮藏60d后进行青贮料发酵品质（pH值,氨态氮（NH3-N）,乳酸（LA）,乙酸（AA）,丙酸（PA）,丁酸（BA）,总酸（TA））和营养成分分析（缓冲能值（BC）,干物质（DM）,粗蛋白（CP）,可溶性碳水化合物（WSC）,中性洗涤纤维（NDF）,酸性洗涤纤维（ADF））评定。【结果】大部分原料干物质和可溶性碳水化合物含量较高,缓冲能较低,适合调制青贮。与原料相比,青贮后各站点材料干物质含量,可溶性碳水化合物,中性洗涤纤维和酸性洗涤纤维含量均不同程度地降低,除站点5和14,而粗蛋白含量降低和提高的约各占一半。16份青贮料间pH、氨态氮占总氮比值,4种有机酸和总酸含量及主要养分（DM、CP、WSC、NDF和ADF）均存在显著差异（P〈0.05）。青贮料pH为4.56—5.69,氨态氮占总氮比例较低。【结论】本试验青贮饲料发酵品质的评定等级可分为优（1、8、9、13、14、15）,良（2、10、12）,中（5,16）和劣（3、4、6、7、11）。

英文摘要：

【Objective】 The silage quality and feasibility of sixteen plant communities in meadow steppe were studied in this paper.【Method】 Fresh grass from 16 sites in meadow steppe were loaded after cutting into polyethylene bag to be vacuumed and sealed.After 60 days,the silage fermentation quality（pH value,content of ammonia nitrogen（NH3-N）,lactic acid（LA）,acetic acid（AA）,propionic acid（PA）,butyric acid（BA）and total acid（TA）） and chemical composition（Buffering capacity（BC）,content of dry matter（DM）,crude protein（CP）,water-soluble carbohydrate（WSC）,neutral detergent fiber（NDF）and acid detergent fiber（ADF）） were analyzed.【Result】 Many of the raw materials were suited to silage,because of their lower buffering capacity and higher content of dry matter and water-soluble carbohydrate.The contents of dry matter,WSC,NDF and ADF in each silage were lower than them in each raw materials,except in sites 5 and 14.But the change of CP content in silage had no trend compared with raw materials.There were significant differences in pH value,NH3-N/TA,contents of four organic acids and total acid and contents of nutrient compositions（DM,CP,WSC,NDF and ADF） among 16 silage materials（P0.05）.The silage pH value was from 4.56 to 5.69,with lower value of NH3-N/TA.【Conclusion】 The rating of silage fermentation quality could be divided into optimal（1,8,9,13,14,15）,good（2,10,12）,medium（5,16） and bad（3,4,6,7,11）.