甘肃白水江国家级自然保护区花色和花期类型的垂直分异

Vertical differentiation of floral color types and flowering phase types in Baishuijiang National Nature Reserve in Gansu

统计了甘肃白水江国家级自然保护区内开花植物花色和花期类型的组成，并分析其580～4072m海拔梯度的变化规律，初步总结了花色类型和花期类型与海拔梯度之间的关系：①植物花色和花期类型丰富度随海拔的升高与环境呈规律性变化，其中1000～1500m海拔段为花色和花期类型的“稳定丰富区”.②花色分布以海拔3300-3400m段为临界线，淡色型（白色、绿色）比例迅速减小，而深色型（红色、蓝紫色）相对增加明显；花期分布以海拔2600-2700m段为临界线，早开花型（春花型）比例迅速减小，而晚开花型（夏秋花型）相对增加明显．

By analyzing the composing of the floral color types and flowering phase types of angiosperm in Baishuijiang National Nature Reserve in Gansu Province, the correlation of the floral color types and flowering phase types with the altitudinal gradient from 580 m to 4 072 m is studied. （1） The results show that with the elevation of the altitude, the diversity of plant floral color type and flowering phase types have the regular variety with the environment, the altitudinal ranges of 1 000- 1 500 m is the zone with abundant species that tend to maintain stable in number. （2） In the altitudinal ranges of 3 300-3 400 m, the percentage of the light floral color types tends to decrease obviously, but the deep color types tends to decrease comparatively; In the altitudinal ranges of 2 600-2 700 m, the percentage of later flowering phase types tends to increase obviously, but the earlier types tends to decrease comparatively. Furthermore, it will be significant to study about ecological environment factors with the altitudinal ranges of 2 700-3 400 m by studying the causes of the vertical differentiation of floral color types and flowering phase types. The study on vertical differentiation of floral color types and flowering phase types can provide academic significance to explore the resources of the wild flower rationally of Baishuijiang National Nature Reserve in Gansu Province, and increase the benefit of ecologic tour of Baishuijiang National Nature Reserve.