关键词: 三峡黄金旅游带, 三峡黄金旅游带, 旅游资源评价, 开发潜力, 空间结构分析

Abstract: Abstract: The low temperature in early spring maize area is one of important natural disaster of Heilongjiang province and has become the important factor that elevated the corn yield level in this district. 8 inbred lines that come from different cold tolerate and origins in this research and made by Griffing Ⅱ design, gain the genetic regularity in emergence period and seedling period with low temperature adverse circumstances. Correlation analysis indicates that correlations exist between relative germination index, relative seedling ratio, relative plant dry weight, relative root dry weight each other. Relative seedling ratio has correlation with relative root total length. These traits can be used as seedling indexes for cool-tolerance identification. There are significant differences in the traits among GCA variance in different parents, SCA variance in relative seedling rate, relative seedling index, relative height of seedling, relative dry weight of seedling, relative dry weight of root, relative number of side root and relative length of the entire root. Additive gene effect is important in relative emergence ratio ,relative germination index , relative plant dry weight, relative root dry weight, relative total root length ,and narrow-sense heritability are generally lower than 50% ,the sequence from high to low are relative germination index, relative seedling ratio , relative root dry weight ,relative plant dry weight , relative root total length. These traits should be selected in higher generations.