Distance to coastal line, annual rainfall and population density consistently influence farm loss.

到海岸线距离、年降雨量、人口密度在三个尺度上对耕地丧失持续作用。

It has the characters of small individual size,fast breeding,the high population density,great harmness,and it can harm more than 150 crops.

它具有个体小、繁殖快、种群密度高、为害重等特点,可为害150余种作物。

The emergence of B. tabaci on cotton fields was in the last ten days of May in Dunhuang city. And then it generally appeared in the last ten days of June, but its population density was at a lower level.

4.敦煌市5月下旬烟粉虱开始迁入棉田,6月下旬开始普遍发生,但虫口密度较低,此后一个月烟粉虱种群数量维持在一个较底水平。

Shanghai is one of the largest cities with the largest population density, the most active economic, and the most energy consumption.

上海市是我国人口密度最大、经济最活跃和能源消耗最大的城市之一。

Obviously,the population density of ring-necked pheasants in Liaoning was lower than those in other provinces and other countries abroad,so conservation strategies to recover its population were discussed.

辽宁省调查地区的环颈雉种群密度明显低于其他省市和欧美地区,应采取加强宣传教育,保护栖息环境等措施。