自暴发开始以来,月病例数已逐步增加,但是这一增加可能是强化监测的结果。
Along with mulching fixed number years lengthening, because of remains film recovery rate is low, the amount of remains film in the soil progressively increase and cause film pollution.随着地膜覆盖栽培年限的延长,由于残膜回收率低,土壤中残膜量逐步增加,造成地膜污染。
The results show that under otherwise equal conditions the absolute values of edge effect in plant population progressively decrease as the horizontal edge distance progressively increase.结果表明:在同一条件下,植物群体边缘效应的绝对值随水平边距递增而递减。