典型草原区放牧绵羊体质量动态变化特征分析

摘要

According to the weight of the grazing sheep in 1987-2007, the minimum value appeared in April, and the maximum in October. The average gained weight was 0.086 3 kg/d during warm-season, but lost 0.049 6 kg/d during cool-season. The analysis with grey correlation suggested that the temperature and wind speed contributed to the change of sheep weight.%根据锡林浩特国家气候观象台试验牧场群体放牧绵羊1987-2007年21年监测资料,对典型草原区放牧绵羊体质量动态变化进行了研究.结果表明:绵羊体质量年变化呈"余弦"曲线,最低值出现在4月末,最高值出现在10月末.暖季绵羊体质量平均增量0.086 3 kg/d,冷季绵羊体质量平均减量0.049 6 kg/d.灰色关联度分析表明,影响典型草原区放牧绵羊体增量的主要气象因素排序是:温度>风速>气压>湿度>日照>降水,其中温度和风速是影响放牧绵羊体增量的主要限制性因素.秋季日均温度-2.9 ℃是当地放牧绵羊体质量下降的临界温度,春季日均温度10.7 ℃是当地放牧绵羊体质量上升的临界温度.