又是一季高考备考,许多同学肯定正在为理科综合考试常常不能获得满意的成绩而纠结,有不少同学可能也正在寻找适合自己的理科综合考试应试方法.每年的高考结束后,总会有部分同学遗憾地表示如果物理、化学和生物三科分开考,肯定会是不同的结果.也有一些同学满怀欣喜,庆幸自己没在某些学科、某些题上纠缠,赢得了答题时间,取得了满意的分数.不可否认,理科综合考试是有技巧的,把握得好不仅不会影响自己发挥真实水平,甚至还能超常发挥.

Biological invasions is one of the three most pressing environmental problems.The invasion of alien animal has caused biodiversity loss,ecological environmental damage and economic losses of China. But to our knowledge,factors influencing regional spatial patterns of these alien animals have not been studied in China,although China is a country heavily infested with these species.Thus,it is very important to clarify the pattern of spatial distribution and the influencing factors of invasive alien animals for further prediction and management.In order to explore the relationship between spatial patterns of invasive alien animals and environmental and anthropological factors,multiple stepwise regression and canonical correspondence analysis were used to determine the effects of environmental variables(including annual precipi-tation,mean temperature in January,mean temperature in July,annual mean temperature,area of province,latitude,longitude and percentage of forest cover)and anthropological factors(including total population,population density,values of annual gross production,GDP on unit area,GDP per capita,values of imported goods,number of foreign tourists and total of transport)on the number,density and spatial distribution of invasive alien animals of China.Results showed that there were 136alien invasive animals recorded in Chi-na,among which insect was accounted for 56.6%.The invasive animals of China were mainly in the unin-tentional ways,accounting for 53.6%of the total invasive animal number.The results indicated that the number of invasive alien animals decreased from the southeast to the northwest,which was largely determined by latitude.Also,the density of invasive alien animals decreased from the southeast to the northwest,which was largely determined by the population density.Our study suggested that latitude and the population density were the main factors that significantly affected the spatial pattern of invasion alien animal at regional and local scale,respectively,in China.These findings may have important implications for the management of invasive animals.