【摘要】 根据1988-2010年广西60个农业病虫测报站资料,采用旋转经验正交函数、趋势系数计算、线性倾向计算、M-K检测等方法,对广西稻飞虱发生等级的时空变化特征进行了研究。结果表明,从整体上看,上半年稻飞虱平均发生等级高于下半年,广西东部高于西部。从逐年变化特征来看,上半年和下半年平均发生等级都呈上升趋势,而下半年的上升趋势更显著。在区域变化特征上,上半年和下半年各可以分为3个主要空间区域,各分区平均发生等级的变化可能与广西各地气候变化的差异也有关。通过对各空间区域代表站的资料进行分析,上半年桂西北区呈显著上升趋势,并在1994年发生了明显增高的突变,而桂西南区和桂东区线性变化趋势不明显;下半年桂西北区和桂东北区呈显著上升趋势,并分别在2006年和1998年发生了明显增高的突变,而桂南区的线性变化趋势不明显。更多还原

【Abstract】 Based on data of 60 agricultural survey stations during 1988 to 2010,the spatiotemporal characteristics of rice planthoppers occurrence degree in Guangxi Province were studied by methods of EOF,trend coefficients, linear trend and M-K test,etc. Results show that,on the whole,occurrence degree of rice planthoppers is higher for the first half year than for the second half year,and is higher in east than in west of Guangxi. The occurrence degrees in both sequential half years have increased in the past 23 years,but it is more obvious for the second half year. As for the spatial change characteristics change of rice planthoppers occurrence degree in Guangxi,the region is divided into three sub-regions,because rice planthoppers occurrence may relate to climate difference for different sub-regions. In the first half year,a significant upward trend of occurrence degree appeared in northwest Guangxi, and a remarkable abrupt increase occurred in 1994. But the trends were not significant in neither southwest nor east. For the second half year,the rice planthoppers occurrence degree in both northwest and northeast showsignificant upward trends,and remarkable abrupt changes of increase occurred in 2006 and in 1998,respectively, but the trend of south was not significant.更多还原