发生面积
文章摘要信息 关键词 : 草地蝗虫;发生面积;预测模型 [gap=1558]Keywords : grasshopper;occurrence area;forecasting model
除上述两地区外均为轻发生区。
They extend by means of natural spread in occurrence area.在发生区内,主要通过自然传播扩散; ④ 。
The occurrence area and species-group density was closed with water level fluctuation and flood time.水位涨落以及淹水时间的长短与飞蝗发生的面积和种群密度关系密切;