芦竹不同高度、不同部位及不同青贮时间的营养价值比较

为评定芦竹（Arundo donax）作为牧草的营养价值，本试验对高0.5 m芦竹的茎、叶、全株及高1 m，1.2 m，1.4 m，1.6 m，1.8 m全株芦竹的营养成分分别进行测定，并收获高1.4 m的全株芦竹进行青贮实验。结果表明：芦竹叶的饲用价值优于茎；高度为1.2~1.4 m的全株芦竹具有较高的营养成分含量；青贮过程中，随着青贮天数的延长，青贮料pH值呈现明显下降的趋势，粗蛋白（Crude protein，CP）含量上升，干物质（Dry matter，DM）、粗灰分（Crude ash，Ash）、中性洗涤纤维（Neutral detergent fiber，NDF）和酸性洗涤纤维（Acid detergent fiber，ADF）含量下降，氨态氮（Ammonia nitrogen，NH₃-N）在青贮时间为30 d时含量最高，水溶性碳水化合物（Water soluble carbohydrate，WSC）含量逐渐下降，综合来看，1.4 m全株芦竹在青贮30 d时效果最佳。本研究结果表明芦竹是一种极具饲料开发潜力的牧草。

Comparison of Nutritive Value in different parts、height and Silage Time of Arundo donax

The purpose of this study was to evaluate the nutritional value of Arundo donax as forage. The contents of nutrients in the stems,leaves,whole plants with a height of 0.5 m and whole plants with a height of 1 m,1.2 m,1.4 m,1.6 m,1.8 m were measured respectively. And the whole plant with the height of 0.4 m was harvested for silage experiment. The results showed that leaves were better than stems of Arundo donax for feeding;The nutritional value in Arundo donax was the highest at the height of 1.2 to 1.4 m;During silage,the pH significantly declined,the content of CP increased,and the content of DM,ash,NDF and ADF declined with silage days,the content of NH₃-N was the highest when the silage time was 30 d,and the content of WSC decreased gradually. It can be concluded that Arundo donax can get a good quality after 30-day fermentation. The results show that the Arundo donax is a kind of forage grass with great development potential for feeding.