放牧强度和放牧时间对高寒混播草地牧草营养含量的影响

Effects of Grazing Intensity and Time on Forage Nutrition Contents in Alpine Mixed-sown Grassland

垂穗披碱草/星星草混播草地三个放牧季的牦牛放牧试验结果表明:放牧强度对牧草总能和粗灰分的影响极显著(P<0.01),对粗蛋白质、磷和中性洗涤纤维的影响显著(P<0.05),而对粗脂肪、粗纤维、钙和酸性洗涤纤维的影响不显著(P>0.05);放牧时间对粗蛋白质、粗纤维、钙、磷、中性和酸性洗涤纤维的影响极显著(P<0.01),对总能、粗脂肪和粗灰分的影响不显著(P>0.05);各放牧区牧草平均总能和磷含量之间呈极显著的负相关关系(P<0.01),与粗蛋白质和粗纤维之间呈显著负相关(P<0.05)。

The result of grazing trial for three grazing seasons in mixed-sown grassland for Elymus nutans/Puccinellia tenuflora showed： Effects of grazing intensity on total energy and contents of crude ash were extremely significant （P〈0. 01）, significant in contents of crude protein, P and NDF （P〈0. 05）, but not significant in con- tents of crude fat, crude fiber, Ca and ADF （P〉0. 05）; moreover, there were extremely significant effects of grazing time on contents of crude protein, crude fiber, Ca, P, NDF and ADF （P〈0. 01）, and then not significant effects on total energy, and contents of crude fat and crude ash （P〉0. 05） ; besides, there was an extremely significant negative correlation between total energy and contents of P （P〈0.01）, and a significant negative correlation between total energy and contents of crude protein and fibre （P〈0.05）.