祁连山南麓中国沙棘的分布与组成特征

位于黄河上游的祁连山南簏地区，具有十分重要的生态价位。区内海拔高度3300～_3600m的范尉内，分布着各种类型的中国沙棘林分。青海云杉 中国沙棘、白桦 中国沙棘这2种自然林分类型，适宜在海拔2700～3000m之间的脑山区仿建；华北落叶松 中国沙棘、青杨 中国沙棘这2种人工混交类型，适宜在海拔2700m以下的浅山区阴坡、半阴坡布没；而中国沙棘纯林及林草复复类型．在脑山区及浅山区的阴坡、半阴坡，均易于人工仿建；海拔3000m以上高寒山区。属于中国沙棘林分的封禁管护范围。生产实践中应仿拟中国沙棘林的自然分布模式，合理布局，科学经营，从而更好地发挥各类中国沙棘林分多方面的生态经济功能。

Characteristics of Distribution and Composition of Hippophae Rhamnoides ssp.Sinensis in Southern Parts of Qilian Mountains

Located in the upper reaches of the Yellow River, the southern parts of the Qilianshanmountains has occupied very important ecological position There exist a lot of natural seabuckthorn stands in an altitude extent from 2300 to 3600 meters Picea crassifolia+Hippophae rhamnoides ssp sinensis, Betula platyphylla+Hippophae rhamnoides ssp sinensis, are two kinds of good mixed native stands for imitation of rehabilitation in high mountains of the elevation from 2700 to 3000 meters, while two kinds of good artificial stands, that is, Larix principis-rupprechtii+Hippophae rhamnoides ssp sinensis, Populus cathayana+Hippophae rhamnoides ssp sinensis, frommore than 40 years practice, are suitable to afforest in the shady and semishady slopes of the low mountains with an elevation under 2700 meters Pure seabuckthorn stands and mixed types of seabuckthorn forests and herbages, are eligible for high mountains and semi-shady and shady slopes in the low mountains In the areas of more than 3000 meters altitude, the natural seabuckthorn bushes should be mainly protected according to the concerning laws The multiple ecoeconomical function of different seabuckthorn stands can be reached after a suitable allocation, scientific management and technology utilization based on the principle of imitating native seabuckthorn forests