不同播种时期对放牧草地牧草收获量和化学成分的影响

通过在Ｓａｓａ ｎｉｐｐｏｎｉｃａ Ｍａｋｉｎｏ占优势的天然草地晚秋强度放牧，秋、春播种的试验结果表明：春播区２年的牧草总收获量高于秋播区；秋、春播种区禾本科与豆科牧草比例基本相同，禾本科比例保持在７０％以上，主要禾本科鸭茅的比例在５０％以上；牧草的营养化学成分含量春播区稍主为秋播区，把Ｓａｓａ ｎｉｐｐｏｎｉｃａ Ｍａｋｉｎｏ占优势的天然草地改良成人工草地时，采用晚秋强度放牧，春季播种较好。

Effect of Sowing Dates on Herbage Yields and Chemical Composition of Grazing Grassland

The mixtures of orchardgrass, timothy, meadow fescue, red clover and white clover were sown into intensive grazed Sasa nipponica grassland in spring and autumn, respectively. The herbage yields were measured for the two consecutive years and chemical compositions were determined. The results showed that the herbage yields obtained from the spring-sowing plots were higher than the autumn-sowing plots, while the proportion of grasmineous and leguminous plants was similar in the pastures established in both sowing dates. The proportion of grasmineous plants was more than 70%, of which more than 50% was orchardgrass. The herbage chemical composition in spring-sowing plots was slightly higher than that in autumn-sowing plots.It suggested that the native Sasa nipponica grassland could be improved by intensive grazing in autumn and then sowing high yield cultivars next spring.