三江源区河南县天然草场草畜营养平衡关系研究

Study on Nutrient Balance of Grassland in Henan County,Sanjiang

为探究三江源区河南县天然牧草草地生产力与草畜平衡之间的关系,采用常规营养成分及体外产气法测定冷暖两季牧草常规营养含量及体外产气指标;选用3头装瘘管的大通牦牛为瘤胃液供体动物,进行天然牧草体外产气测定,并核定草场载畜量。结果表明:冷暖两季可食产草量较1988年下降;暖季垂穗披碱草草场型牧草具有最高产气量,不同草地类型产气量有差别,产气速率趋同;河南县天然牧草的数量、DCP、ME载畜量分别为209.9、185.4、354.7万个羊单位。

In order to explore the relationship between the productivity of pasture grassland and the balance of grass and livestock in Henan County of Sanjiangyuan District,conventional nutrient components and in vitro gas production method were used to determine the conventional nutrient content and the in vitro gas production index of forage in the cold and warm seasons;The yak is a rumen fluid donor animal,and the in vitro gas production of natural pasture is determined,and the amount of livestock carried on the pasture is verified.The results showed that the amount of edible grass production decreased in the cold and warm seasons compared with 1988;in the warm season,the highest yield of gas was found in the Elymus sinica pastures,and there was a difference in the gas production of different grassland types,and the rate of gas production was the same;the natural pastures of the livestock carrying capacity of number,DCP and ME were 209.9,185.4 and 3.547 million sheep units,respectively in Henan county.