二化螟与水稻被害株的空间、数量、时间结构及其动态

本文基于二化螟(Chilo suppressalis Walker)与水稻被害株的相互联系,着重研究了二化螟被害株空间、数量、时间结构及其动态,揭示了幼虫为害后水稻的枯鞘、枯心及白穗的空间聚集强度、聚块面积及其动态变化的内在规律.文中给出了二化螟幼虫及其被害株的数量动态与空间动态的综合模型.本研究明确了二化螟的扩散为害行为对稻株群体的影响,为探索水稻对二化螟为害损失及其补偿的规律,确立合理的防治指标以及害虫管理措施提供依据.

THE STRUCTURE AND DYNAMICS IN SPACE, NUMBER AND TIME OF DAMAGED RICE IN PADDY FIELDS INFESTED BY STRIPED RICE BORER CHILO SUPPRESSALIS WALKER

The structure and dynamics in space, number and time of damaged rice in paddy fields infested by striped rice borers Chilo suppresalis Walker were studied on the basis of relationship between the behaviour of the borer and the damaged rice. As a result, parameters such as spatial aggregative intensity, patch size and changing pattern of damaged rice in form of dead sheath, dead heart and white head were determined. A comprehensive model has been proposed to express the holonomic relations between space and number of the damaged rice. The effects on the growth of rice caused by the rice borer through dispersal and cause damage have been assessed with the aim to seek scientific basis to define rice compensation capacity and yield loss after rice borer damage and to set rational economic injury levels for chemical control of the pest.