北半球500hPa高度场遥相关指数对我国草地螟成虫物候期与幼虫发生面积的影响

北半球500hPa高度场的遥相关指数(遥相关指数)是一个综合了气温,降水以及气压等众多气象因素的气候变化指数,很多生物学现象都与其有关;为了探究遥相关指数是否对我国的草地螟的发生危害有影响,作者分析了我国草地螟Loxostege sticticalisL.成虫物候期及幼虫发生面积的变化趋势及两者与遥相关指数的相关关系,结果表明:我国草地螟成虫始见期年际间有显著提前的趋势,平均每年提前0.40d,与1—5月极地-欧亚型遥相关指数均值(POL1-5)相关性最大;终见期有显著延后的趋势,平均每年延后1.31d,与6—10月东太平洋型遥相关指数均值(EP-NP6-10)相关性最大;全国草地螟幼虫发生面积年际间有显著增长的趋势,平均每年增长57.07khm2,与1—10月东大西洋型遥相关指数均值(EA1-10)相关性最大。

Effect of northern hemisphere teleconnection pattern indices of 500 hPa height field on phenology of moth and damage area of larvae of Loxostege sticticalis

The northern hemisphere’s 500 hPa height field teleconnection pattern indices integrate various meteorological factors such as temperature, precipitation and air pressure. Many biological phenomena have been reported to be related to these indices. In order to find out whether these indices affect the occurrence and crop damage caused by Loxostege sticticalis L., we tested trends in the phenology of annual moth occurrence and damage caused by its larvae and analyzed correlations between these and the indices in China. The results indicate that the date on which the first L. sticticalis moth was caught （FMCD） displayed a significant advance trend of 0.40 d per year on average, and had a maximum correlation coefficient with a mean POL value from Jan. to May. The date on which the last moth was caught （LMCD） took on a significant postponed trend of 1.31 d per year on average, and had a maximum correlation coefficient with a mean value of EP-NP from Jun. to Oct. The area subject to damage by L. sticticalis larvae had a significant increasing trend of 57.07 khm2, and a maximum correlation coefficient with a mean value of EA from Jan. to Oct.