划区轮牧中不同放牧利用时间对草地植被的影响

对比研究了划区轮牧中不同时间的放牧利用对各小区的植被状况的影响。结果表明 ,在固定放牧时间长度的情况下 ,早放牧小区的草群结构比晚放牧的小区受到的影响大。家畜对早放牧小区的牧草利用率高于晚放牧的小区 ,草地生产力则表现出相反的趋势。对于可利用牧草营养 ,早放牧的小区可提供较多的粗蛋白。在生产实践中 ,要灵活应用划区轮牧制度 ,对不同时间放牧利用的各小区要根据草地的实际情况来确定其具体的放牧时间长度 ,在不同的年度也要按不同的顺序来轮换放牧 ,兼顾到草地的可持续利用与家畜生产。

Effect of different grazing time on vegetation in different paddocks of the rotational grazing pasture

In this experiment, the effect of different grazing time but fixed length on vegetation in the different rotational grazing paddocks was studied. The result showed that the structure of the vegetation, grazed in early time, apt to be changed comparatively to that grazed in later time and the ungrazed paddocks. The use ratio of herbage was higher in the early grazed paddocks than that in the later grazed ones, but the productivity of the vegetation showed an opposite trend. In practice the grazing time should be flexible considering both the sustainable use of the vegetation and animal productivity.