根据门源草原毛虫(Gynaephora menyuanensis Yan et Chou)蛹种群密度和零样方比例,建立了 Nachman 简易估计抽样模型:雄蛹公式=exp[1.21821n(-lnp。)+0.3282]雌蛹公式=exp[1.32881n(-lnp。)+0.3651]并依据该毛虫蛹种群的空间分布型...根据门源草原毛虫(Gynaephora menyuanensis Yan et Chou)蛹种群密度和零样方比例,建立了 Nachman 简易估计抽样模型:雄蛹公式=exp[1.21821n(-lnp。)+0.3282]雌蛹公式=exp[1.32881n(-lnp。)+0.3651]并依据该毛虫蛹种群的空间分布型和密度关系,对模型的可靠性及估计精度进行了讨论,确定了应用理论抽样模型。展开更多
Hami City is the main locust plague area in Xinjiang.In the past,chemical pesticide control of locusts was mainly adopted,which not only cost a lot of manpower,material and financial resources,but also killed natural ...Hami City is the main locust plague area in Xinjiang.In the past,chemical pesticide control of locusts was mainly adopted,which not only cost a lot of manpower,material and financial resources,but also killed natural enemies of locusts and other insects due to the extensive use of chemical pesticides.As a result,the natural ecological environment of grassland was damaged and polluted to varying degrees,while the grassland ecosystem was deteriorating day by day.Since 2004,the prevention and control of grassland locusts has been carried out by chicken herding,duck herding,nesting for attracting birds,as well as biological and plant pesticides.In particular,the proportion of rosy starling control technology in grassland locust control has increased year by year,and the grassland ecosystem has recovered significantly.展开更多
文摘根据门源草原毛虫(Gynaephora menyuanensis Yan et Chou)蛹种群密度和零样方比例,建立了 Nachman 简易估计抽样模型:雄蛹公式=exp[1.21821n(-lnp。)+0.3282]雌蛹公式=exp[1.32881n(-lnp。)+0.3651]并依据该毛虫蛹种群的空间分布型和密度关系,对模型的可靠性及估计精度进行了讨论,确定了应用理论抽样模型。
文摘Hami City is the main locust plague area in Xinjiang.In the past,chemical pesticide control of locusts was mainly adopted,which not only cost a lot of manpower,material and financial resources,but also killed natural enemies of locusts and other insects due to the extensive use of chemical pesticides.As a result,the natural ecological environment of grassland was damaged and polluted to varying degrees,while the grassland ecosystem was deteriorating day by day.Since 2004,the prevention and control of grassland locusts has been carried out by chicken herding,duck herding,nesting for attracting birds,as well as biological and plant pesticides.In particular,the proportion of rosy starling control technology in grassland locust control has increased year by year,and the grassland ecosystem has recovered significantly.
