黄河源区黑土滩人工草地牧草植物量及营养动态研究

对黄河源区黑土滩人工草地在封育和放牧两种不同管理方式下,从8月到翌年的4月进行了地上植物量及牧草营养成分动态研究,结果表明:从8月到翌年4月牧草的自然损失量为138.7g/m~2,损失率为34.3%,家畜的采食量为174.9g/m~2,草地的实际利用率为43.3%;整个冷季牧草总体营养价值呈下降趋势,封育草地粗蛋白降低了56.87%,粗脂肪降低了51.09%。该类草地在夏季属碳氮营养型(CN),冬季属碳营养型(C)。

Dynamics of Biomass and Nutrition of Grass on Artificial Grassland of Black Soil Beach in Yellow River Headwater Area

This test studied dynamic of biomass and nutritional value of grass on artificial grassland of black soil beach under nurture and grazing management manner from August to April of next year. The result showed that the natural loss quantity of grassland productivity was 138.7g/m^2 ,the loss rate was34.3% ,the feed intake of livestock was 174.9g/m^2. Grassland actual utilization rate was 43. 3%. Under traditional grazing way, Nutrition value of forage decreased generally in whole cold season. The content of crude protein decreased by 56.87% ,crude fat decreased by 51.09% in nurture grassland. The nutritive type of grassland is carbon and nitrogen （ CN ） type in summer and carbon（ C ）type in winter.