新疆半干旱地区不同种类混播草地的牧草产量和营养价值研究

提高混播草地的生产力和维持其营养价值对提高新疆半干旱地区放牧家畜生产力具有重要意义。本研究选择4种牧草，以单播为对照，设置豆禾两种牧草和3种牧草进行混播，分析混播草地生产力和牧草营养价值变化。结果表明：与单播相比，混播草地不仅具有明显生物量优势，而且牧草的酸性洗涤纤维和中性洗涤纤维含量更低，粗蛋白含量、干物质消化率、干物质采食量和相对饲喂价值更高；随着生长年限的增加（2016年到2018年），单播和混播草地牧草干物质产量、粗蛋白产量、酸性洗涤纤维、中性洗涤纤维含量均显著增加，但粗蛋白含量、干物质消化率、干物质采食量和相对饲喂价值均显著下降。

Study on Forage Yield and Nutritional Value of Mixed-culture Grassland of Different Legume and Grass Forage in Semi-arid Area of Xinjiang

Improving the productivity of mixed-culture grassland and maintaining its nutritional value are of great significance for improving the productivity of grazing livestock in semi-arid areas of Xinjiang. In this study, the mono-culture of four forage, such as smooth bromegrass (Bromus inermis L), ochard grass (Dactylis glomerata L), sainfoin (Onobrychis viciaefolia Scop) and red clover (Trifolium pratense), were control, the forage yields and nutritional value of mixed-culture grassland of two kinds and three forage combinations were monitored for three years, to analyze the quality change of forage in mixed grassland. The results showed that compared with single sowing, the forage yield of two forages and three forages in mixed grassland had obvious advantages. The forage in mixed grassland had lower acid detergent fiber (ADF), neutral detergent fiber (NDF) and digestibility, and higher crude protein content (CP), dry matter digestibility (DDM), dry matter intake (DMI) and relative feeding value (RFV). With the increase of growth years, the DMY, CPY, ADF, and NDF of the forages were significantly increased in monoculture and mixed grassland, but CP, DDM, DMI, and RFV were all significantly decreased.