黄河三角洲大鸨越冬规律研究

The Wintering Regularity of Great Bustard in the Yellow River Delta

2021年10月下旬至2022年4月上旬,在黄河三角洲地区适宜大鸨栖息越冬的所有生境,以每周1次的时间间隔,经21次连续调查证实:大鸨越冬数量为43~48只,越冬时间为110天左右,最早迁来时间为11月上旬、迁离时间为3月下旬;大鸨活动规律为清晨日出时刻由夜宿地飞至觅食地觅食,清晨至中午时段觅食频繁,下午以休息为主间或觅食,觅食期间偶到黄河边饮水,傍晚日落时刻返回夜宿地;收割稻穗、放牧、田间车辆行驶、早春农耕作业、春季烧荒、农作物种植方式改变等因素是影响大鸨越冬的干扰因素。

During late October to early April,continuous 21 field surveys had been carried out every weeks in all Great Bustards’suitable wintering habitats.As a ruslut to show:the number of wintering individuals was 43—48,wintering period was about 110 days,the early migratory period was early November,the leave-off period was late March.When the sun-rise time,Great Bustards left sleeping site to feeding site and kept feeding till midday,they feeded or rested during afternoon or watered to yellow river during feeding.At the sunset,the returned sleeping site.Many factors distrubed them,such as harvesting rice,grazing,driving,farming,burnning and the planting model of farmland.