高山草甸草地牧草产量及其营养变化规律

The Herbage Yield and the Nutrient Variation in Mountain Meadow

高山草甸草地是青海省主要冬存放牧地，占冬吞草地总面积的４７．９６％。对所测高山草甸草地实行全年封育，每月测定草地地上生物量和营养物质。测定结果表明：①牧草产量以８月分最高，９６．８２ｇ／ｍ２，翌年５月最低，２２．２５ｇ／ｍ２，全年呈单峰地，牧草营养物质总产量亦是如此规律，牧草粗蛋白质含量和粗纤维含量随牧草生长期的推移呈负相关（ｒ＝－０．８９５）；②冬春季节牧草经长时间的日晒、风吹，白然损失严重，牧草产量损失率高达７７％，平均为４８．３０％，粗蛋白质损失率达６５％，总能损失率达７６％；③冬春季节牧草中粗蛋白质含量在９％以下，磷含量只有０．０６％，显然不能满足放牧家畜的营养需要。

Mountain meadow,the main grazing land in winter and spring in Qinghaiprovince,take 47.90%of the total winter-and-spring grassland.Monthly measurement of thebiomass and nutrient output in blocked mountain meadow in a year showed that :①Herbage yieldreach the peak of 96.82g/m2 in Aug,and the valley of 22. 25g/m2 in next May. Herbage yieldappeared to be single peak in a year,so did the totabnutrient output there is a negative corretation(r=-0.895)between Herbage crude protein(CP cnontent and crude fiber content in the grow-ing stage;②Due to the long time of sun taning and vind blowing in winter and spring,the lossrate of herbage yields skyrocketed to 77%,with the m:an of 48. 30%,and that of CP and grossenergy was 65%and 76%,resp.;③CP content in herbage was below 9%in winter and spring,and P content was 0.06%in the same time,obviously the nutrition content could not meat therequirement of liviing stock.