<正>从解剖学角度观察了海棠果插穗不定根的发育过程，结果表明：（1）海棠果2年生插穗茎内无潜伏根原基，不定根由诱生根原基发育形成。诱生根源于初生射线与维管形成层交汇处细胞的分裂分化。大约经15d，不定根原基发育为幼小不定根并伸出周皮之外。（2）愈伤组织内有些细胞分化为具螺纹加厚的厚壁细胞。在愈伤组织内未发现根原基。

On the basis of image fusion and feature transform for ASTER original 9 bands, in combination with the training data of 8 land cover types distributed within the study area and the measures of 48 sample plots of poplar, objective evaluation in terms of performance of classification and correlation of modeling was conducted in this paper. The results indicated that combination of vegetation indices with the highest average separability was taken as the optimal subset for subsequent classification to better characterize their spatial distribution of predominant land cover types. Meanwhile, H feature derived from HIS fusion possessed a strong correlation with ground average height and stem volume of poplar, and NDVI played a significant role in retrieving age of poplar.