对贺兰山汝箕沟阳坡海拔1 600~1 900 m的蒙古扁桃〔Amygdalus mongolica （Maxim.） Ricker〕3种花柱型花的比例和表型性状进行比较，并对这些指标与海拔进行Pearson相关性分析。结果显示：海拔1 700 m的蒙古扁桃3种花柱型花比例差异较大，其余海拔3种花柱型花比例差异较小，且不同花柱型花比例与海拔的相关性不显著（P＞0.05）。3种花柱型花的表型性状中，仅海拔1 900 m的长花柱型花单花质量显著（P＜0.05）高于海拔1 700 m，中花柱型花雌雄异位程度显著低于海拔1 600和1 800 m，短花柱型花雌蕊长显著高于海拔1 600和1 800 m、雌雄异位程度显著低于海拔1 600和1 700 m；海拔1 800 m的短花柱型花雄蕊长显著低于海拔1 600和1 700 m。相关性分析结果表明：仅长花柱型花单花质量以及中花柱型花和短花柱型花的雌雄异位程度与海拔显著相关，相关系数分别为0.459、-0.525和-0.427。结果显示：海拔对蒙古扁桃不同花柱型花的比例和表型性状影响较小，仅对长花柱型花单花质量以及中花柱型花和短花柱型花的雌雄异位程度有较大影响。

 Percentages and phenotypic traits of three style. types of flowers of Amygdalus mongolica （Maxim.） Ricker at the elevation of 1 600-1 900 m in sunny slope of Rujigou in Helan Mountain were compared， and Pearson correlation analysis of these indexes with elevation was performed. The results show that the difference in percentages of three style. types of flowers of A. mongolica at the elevation of 1 700 m is the largest， while those at the other elevations are relatively small， and the correlations between percentages of different style. types of flowers and elevation are not significant （P＞0.05）. Among the phenotypic traits of three style. types of flowers， only single flower mass of long style. type of flower at the elevation of 1 900 m is significantly （P＜0.05） higher than that at the elevation of 1 700 m， heteroecious degree of middle style. type of flower is significantly lower than those at the elevation of 1 600 and 1 800 m， pistil length of short style. type of flower is significantly higher than those at the elevation of 1 600 and 1 800 m， and heteroecious degree is significantly lower than those at the elevation of 1 600 and 1 700 m； stamen length of short style. type of flower at the elevation of 1 800 m is significantly lower than those at the elevation of 1 600 and 1 700 m. The correlation analysis result shows that only single flower mass of long style. type of flower and heteroecious degree of middle style. type of flower and short style. type of flower significantly correlate with elevation， and the correlation coefficients are 0.459， -0.525， and -0.427， respectively. It is suggested that elevation has a little effect on percentages and phenotypic traits of different style. types of flowers of A. mongolica， and only has a relatively large effect on single flowermass of long style. type of flower and heteroecious degree of middle style. type of flower and short style. type of flower.